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250-421 Design of DP Solutions for UNIX using NBU 5.0

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250-421 exam Dumps Source : Design of DP Solutions for UNIX using NBU 5.0

Test Code : 250-421
Test appellation : Design of DP Solutions for UNIX using NBU 5.0
Vendor appellation : Symantec
: 110 actual Questions

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Symantec Symantec Design of DP

Symantec products merit commonplace standards EAL2+ Certification | killexams.com actual Questions and Pass4sure dumps

source: Symantec

July 17, 2008 08:00 ET

CUPERTINO, CA--(Marketwire - July 17, 2008) - Symantec Corp. (NASDAQ: SYMC) nowadays announced that Symantec Endpoint insurance map 11.0 and Symantec community access handle eleven.0 had been awarded regular criteria comparison Assurance flat 2 augmented with ALC_FLR.2 and AVA_MSU.1 (EAL2+) certification. This certification assures valued clientele that Symantec Endpoint protection and Symantec network access manage believe gone through a rigorous evaluation and trying out manner and conform to specifications sanctioned via the international specifications corporation. commonplace criteria is a crucial worldwide assessment typical for security products as its certifications are identified in 25 nations entire over.

according to the concomitant certification, Symantec Endpoint insurance map is conformant to the U.S. govt protection Profile for Anti-Virus purposes for Workstations in fundamental Robustness Environments, version 1.1, April 4, 2006. For extra suggestions about Symantec's ordinary criteria certifications, consult with: http://www.cse-cst.gc.ca/features/ordinary-standards/depended on-products-e.html.

"This certification additional validates the capacity of Symantec Endpoint insurance policy and Symantec network access handle to give protection to any corporation," illustrious Brad Kingsbury, senior vice chairman Endpoint safety and administration, Symantec Corp. "Recognizing that the Federal executive is a leading proponent of typical standards certification, Symantec is neatly positioned to proceed presenting customers in the offshoot of defense and civilian federal groups with endpoint insurance policy know-how that meets stringent EAL2+ certification."

Symantec Endpoint insurance policy combines Symantec AntiVirus with advanced hazard prevention to deliver defense in opposition t malware for laptops, desktops and servers. It provides insurance map against subtle assaults that evade orthodox protection measures, similar to rootkits, zero-day attacks and mutating spyware. Symantec network entry control securely controls entry to company networks, enforces endpoint security coverage and easily integrates with present network infrastructures.

Communications safety establishment Canada (CSEC) participates in the international orthodox criteria focus association (CCRA) on Canada's behalf and units the necessities for the Canadian certification technique. Upon a hit completion of the certification manner, a product's safety target and Certification file and its certificates of Product assessment are posted on CSEC's web site at: http://www.cse-cst.gc.ca/services/normal-standards/general-standards-e.html.

About customary standards

The orthodox standards for recommendation technology protection comparison (CC) is a set of evaluation standards agreed to via the united states' country wide safety company/countrywide Institute of specifications and applied sciences and equivalent bodies in 24 different countries. It turned into designed to rep to the bottom of the technical and conceptual modifications amongst latest requisites for the contrast of safety techniques and products. Certification to the universal standards requires in-depth analysis of product design and construction methodology, backed with the aid of huge testing. common criteria is at present identified through here international locations: united states, Canada, Australia, unusual Zealand, Austria, The Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, India, Israel, Italy, Japan, Malaysia, The Netherlands, Norway, Republic of Korea, Singapore, Spain, Sweden, Turkey, and the United Kingdom.

The gauge standards represents the result of efforts to boost criteria for contrast of IT protection that are greatly authorized inside the foreign group. extra assistance is available at http://www.commoncriteriaportal.org.

About Symantec

Symantec is a world leader in providing security, storage and methods administration options to allay organizations and patrons comfy and manage their tips. Headquartered in Cupertino, Calif., Symantec has operations in more than 40 countries. extra assistance is attainable at www.symantec.com.

note TO EDITORS: if you'd affection more information on Symantec organisation and its items, gladden talk over with the Symantec intelligence margin at http://www.symantec.com/information. entire expenditures stated are in U.S. greenbacks and are telling most efficient in the u.s..

Symantec and the Symantec logo are emblems or registered logos of Symantec enterprise or its associates in the U.S. and different countries. other names may well exist trademarks of their respective house owners.


patrons File class action Lawsuit in opposition t Symantec for faulty AntiVirus application | killexams.com actual Questions and Pass4sure dumps

Schubert legislation enterprise Investigating Claims in opposition t protection software company concerning Vulnerabilities in community protection software products

SAN FRANCISCO, Nov. eight, 2018 /PRNewswire/ -- patrons believe filed a class motion lawsuit in opposition t Symantec organization (SYMC), alleging that from 2005 to 2016, the protection utility company bought antivirus items containing faultfinding defects that uncovered total computer working techniques to quite a lot of protection vulnerabilities and made them more at risk of cyberattacks, in keeping with Schubert Jonckheer & Kolbe, which represents the buyers.

The lawsuit, filed on April 2, 2018 in the U.S. District courtroom for the Northern District of California, alleges that buyers who purchased Symantec's safety products below the Norton company, in addition to businesses that purchased items beneath the Symantec brand, suffered from publicity to recollection corruption, far flung assaults, and other with no catastrophe exploitable protection vulnerabilities. Symantec handiest launched patches for these defects in June 2016, with the assist of assignment Zero, a crew of professional cybersecurity analysts who first discovered the vital defects in the core engine that supported Symantec's complete product line.

according to the lawsuit, Symantec had failed to patch third-birthday celebration supply code in its items over a a few-12 months period spanning at the least seven years, contradictory to cybersecurity superior practices, which require well timed implementation of protection updates to utility. furthermore, Symantec didn't design its items to restrict the influence of a vulnerability on a pc's operating equipment via violating the fundamental precept of least privilege, another fundamental cybersecurity highest trait follow. It was not unless 2017 that Symantec up-to-date its product line to conform to the precept of least privilege via including a sandbox that directs the core engine to hasten and analyze unknown data in an isolated, protected atmosphere.

in case you bought a Norton or Symantec company security product between 2005 and 2016, you could exist entitled to money back of the purchase expense. in case you consider you had been suffering from these antivirus software defects, gladden contact us today to study extra.

About Schubert Jonckheer & KolbeSchubert Jonckheer & Kolbe represents shareholders, personnel, and patrons in category actions towards company defendants, in addition to shareholders in spinoff moves against their officers and administrators. The enterprise is based in San Francisco, and with the assist of co-tips, litigates situations nationwide. attorney advertising. Prior consequences don't assure similar effects.

ContactCassidy KimSchubert Jonckheer & Kolbe LLPckim@sjk.lawTel: 415-788-4220

 

View common content material:http://www.prnewswire.com/news-releases/buyers-file-classification-motion-lawsuit-against-symantec-for-faulty-antivirus-software-300746568.html


Symantec Discovers ‘Regin’ covert agent Code Lurking on computing device Networks | killexams.com actual Questions and Pass4sure dumps

image safety researchers at Symantec discovered proof that unusual malware has been used on targets in 10 nations, primarily Saudi Arabia and Russia, in addition to Pakistan, Afghanistan and Mexico.credit Symantec, via Reuters

protection researchers negate they believe got discovered a sophisticated piece of malicious code spying on researchers, governments, groups, and faultfinding telecommunications infrastructure considering the fact that 2008.

The malware, called Regin, turned into first institute with the aid of Symantec, the antivirus enterprise, which released a white paper describing its findings on Sunday. On Monday, The Intercept, a digital magazine started via the journalist Glenn Greenwald, reported that the Regin malware is a component of a decade-lengthy joint operation through the countrywide security company and its British counterpart, the executive Communications Headquarters, or G.C.H.Q. The Intercept file is primarily based partly on disclosures from former N.S.A. contractor Edward J. Snowden.

“on the planet of malware threats, handiest just a few rare examples can basically exist regarded groundbreaking and pretty much peerless,” Symantec wrote. “What they believe viewed in Regin is only such a class of malware.”

Symantec institute proof that the malware has been used on targets in 10 countries, essentially Saudi Arabia and Russia, as well as Pakistan, Afghanistan, India, Mexico, ireland, Belgium and Austria. The Intercept pronounced Monday that the malware had been used to covert agent on groups within the European Union, notably Belgacom, a partly state-owned Belgian cellphone and information superhighway company.

The Regin malware is particularly customizable, researchers stated, and may exist tweaked to encompass unusual features and capabilities, counting on the goal. Symantec’s researchers assay that it seemingly took months “if no longer years” to ameliorate and pointed out the malware’s “authors believe long gone to tremendous lengths to cowl its tracks.”

The researchers consider the malware changed into first used to spy on people in 2008, except it turned into “suddenly withdrawn” in 2011. The Intercept pronounced that the malware was used to infect a Belgacom server in 2010.

Then, remaining 12 months, Symantec pointed out the authors began the usage of a brand unusual version of the identical malware to undercover agent on a entire lot of victims. amongst them: educational researchers, individuals and miniature companies, companies in the airline, energy and hospitality sectors in addition to telecom organizations, in what researchers accept as just with turned into an try to gain entry to cell calls routed via their appellation facilities.

Regin is undeniably a spy device, according to its capabilities, the researchers spoke of. it's configured to seize screenshots and bewitch over a pc mouse’s aspect-and-click characteristic. it may well moreover seize passwords, array screen network traffic and acquire assistance from the computer’s reminiscence. it may well scan for and retrieve deleted data.

past those simple capabilities, its capabilities vary from goal to goal. in a single case, Symantec’s researcher institute that Regin had been tweaked to odor traffic despatched to cellular mobile groundwork station controllers. In an additional case, it had been personalized to parse mail from Microsoft’s trade e-mail databases.

one of the most last mysteries, researchers say, is how victims are contaminated with Regin in the first place. Symantec referred to the an infection formula varies from goal to goal. in one case, it directed victims to spoofed models of widely wide-spread web sites, then downloaded malware onto their machines. in the case of Belgacom, The Intercept illustrious it discovered evidence that the attackers despatched employees at the company to a faux LinkedIn web page that downloaded the malware onto their machines. In another case, Symantec mentioned, it originated from Yahoo’s fleet Messenger service, via an “unconfirmed bewitch odds of.”

The Regin malware assaults its victims in diverse tiers, with every stage hidden and encrypted, aside from the introductory compass across.

“It goes to astounding lengths to conceal itself and its activities on compromised computers,” Symantec researchers wrote in their white paper. “Its stealth combines many of the most superior thoughts that they now believe ever considered in use.”

Symantec institute out five levels of the assault, however as a result of every stage turned into encrypted, they might simplest parse the assault once that they had accrued counsel on entire five levels. “only by route of acquiring entire 5 tiers is it feasible to analyze and bewitch into account the risk,” Symantec mentioned.

The multi-staged design of the malware is akin to that of alternative espionage tools that security researchers faith had been the labor of nation states, specially Flame, Stuxnet and Duqu — three pieces of malware that had been used to spy on computer systems in Iran and had been believed to exist a joint application by using the USA and Israel.

Like these spy tools, researchers accept as just with Regin’s construction took years and will best were developed via “a nation state” with the time and resources. “Its design makes it highly gauge for persistent, lengthy-term surveillance operations towards ambitions.”

The Intercept stated Monday that the implement turned into a fragment of a joint N.S.A.- G.C.H.Q. software, codenamed “Operation Socialist.”

Vanee Vines, a N.S.A. spokeswoman declined to handle upon what the company known as “speculation.”

“the invention of Regin serves to highlight how massive investments continue to exist made into the structure of tools for utilize in intelligence gathering,” Symantec researchers stated.

They added, “Many accessories of Regin believe nevertheless long past undiscovered and extra functionality and versions might moreover exist.”


250-421 Design of DP Solutions for UNIX using NBU 5.0

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250-421 exam Dumps Source : Design of DP Solutions for UNIX using NBU 5.0

Test Code : 250-421
Test appellation : Design of DP Solutions for UNIX using NBU 5.0
Vendor appellation : Symantec
: 110 actual Questions

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Design of DP Solutions for UNIX using NBU 5.0

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The SCO Group Releases Virtualized Version of current OpenServer® 5.0.7 UNIX® Operating System | killexams.com actual questions and Pass4sure dumps

OpenServer 5.0.7V optimized for VMware(R) allows customers to bewitch odds of the latest hardware and application environments.

LINDON, Utah, Aug. 19 /-- The SCO Group, Inc., (Pink Sheets: SCOXQ) a leading provider of UNIX software technology and mobility solutions, today announced that it has released OpenServer 5.0.7V, a virtualized version of its current UNIX operating system that is optimized for the VMware environment. OpenServer 5.0.7V gives customers a chummy environment while increasing the power and efficiency of a virtualized infrastructure. With OpenServer's renowned stability and reliability, now available in a virtualized environment, customers can avoid costly migration and retooling costs in order to bewitch odds of newer hardware and applications.

"With OpenServer 507V, SCO is protecting their customer's investment in their OpenServer applications by extending their life cycle without the requisite to migrate," said Jeff Hunsaker, president and chief operating officer, SCO Operations. "This provides a superior Total Cost of Ownership to an OpenServer 5 application while at the same time taking odds of the significant performance gains with unusual modern hardware. They expect, in the near future, to release virtualized versions for OpenServer 6 and UnixWare 7.1.4 as well."

OpenServer 5.0.7V is released as a Virtual Appliance image that can exist easily imported onto VMware ESX 3.5, VMware ESXi 3.5 and VMware Workstation 6.5.2 for Windows platforms. Importation of the Virtual Appliance usually takes between 10 and 60 minutes to complete, depending on configuration, and configuration of the imported Virtual Appliance takes a further 5-10 minutes. Once installed, the system behaves just affection a natively-installed OpenServer 5.0.7 system with entire of the latest maintenance installed. For convenience, many of the VMware tools believe moreover been included to ameliorate integration between SCO OpenServer 5.0.7V and the host VMware system.

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NMR structure of the C-terminal domain of TonB protein from Pseudomonas aeruginosa | killexams.com actual questions and Pass4sure dumps

Introduction

The periplasmic space resides between the outer membrane (OM) and cytoplasmic membrane (CM) of Gram-negative bacteria. The OM protects Gram-negative bacteria from environmental hazards such as antibiotics and detergents. At the same time, Gram-negative bacteria require rare essential nutrients such as iron, vitamins that are present in the extracellular environment at very low concentrations. Gram-negative bacteria believe evolved active acquisition systems to pass the essential nutrients through OM and CM. Since there is no electrochemical gradient to power the active transport at the OM and no ATP in the periplasmic space, these transporters must extract energy from the CM. These transporters in the OM are termed TonB-dependent transporters (TBDT) because they presumably extract the energy from the proton-motive force (pmf) of the CM via the trans-periplasmic protein, TonB protein (Fig. 1A). The energy transduction is assumed to bewitch residence via the TonB tangled anchored in CM and consisting of TonB, ExbB, and ExbD proteins. ExbB and ExbD are accessory proteins anchored in the CM that convey the pmf across the CM to TonB (Celia et al., 2016; Clarke, Tari & Vogel, 2001; Krewulak & Vogel, 2008; Postle & Larsen, 2007).

Figure 1: TonB-dependent energy transduction system and structures of differently dissected E. coli TonB. (A) A schematic model of the TonB-dependent energy transduction system, which transduces the proton motive force of the CM to TonB-dependent transporters (TBDT) via TonB. (B) Sequence alignment presenting the full-length E. coli TonB sequence and differently dissected CTDs used for the structure determination (labeled with PDB IDs). CTDs are highlighted in gray, and the TM region is indicated by a bar. (C) Ribbon drawings of previously reported E. coli TonB CTD structures. The last β-strands at the C-terminal region with the largest conformational differences among the reported structures are colored in red. 1IHR forms intertwined dimers (Chang et al., 2001) and 1U07 forms dimers connected via the C-terminal extended strand (Ködding et al., 2005) in crystals.

TonB protein mediates the energy transduction from the CM to TBDTs. TonB has an N-terminal transmembrane (TM) domain anchored in the CM (Fig. 1). The TM domain is followed by the central region mostly consisting of Pro-Glu and Pro-Lys repeats (Fig. 1B). Extended conformation of the central region allows the protein to span the periplasmic space between OM and CM (Domingo Köhler et al., 2010). The C-terminal domain (CTD) of TonB protein has a globular structure and interacts with a conserved TonB box motif located at the N-terminus of TBDTs (Cadieux & Kadner, 1999; Pawelek et al., 2006; Peacock et al., 2005; Shultis et al., 2006). Despite a wide variety of models for the energy transduction mechanism by TonB, it is noiseless unclear how TonB protein works in the energy transduction that presumably causes the structural changes of the plug domain in TBDTs to facilitate the transport (Celia et al., 2016; Chimento, Kadner & Wiener, 2005; Gresock et al., 2011; Klebba, 2016; Letain & Postle, 1997; Sverzhinsky et al., 2015; White et al., 2017). The crystal structures of the complexes with two different outer membrane receptors from Escherichia coli BtuB and FhuA suggests direct interactions between β-sheets in the CTD of TonB protein and the TonB box (Shultis et al., 2006; Pawelek et al., 2006). Currently proposed models to induce the structural changes of the plug domain embrace the mechanical pulling of the plug domain via the interaction with TonB box and CTDs of TonB, which are supported by the atomic force microscopy and molecular dynamics (MD) simulation studies suggesting that the interaction is tough enough to remain stable during the mechanical unfolding of the plug domain (Chimento, Kadner & Wiener, 2005; Gumbart, Wiener & Tajkhorshid, 2007; Hickman et al., 2017). Furthermore, the interaction between a highly conserved positive charge at Arg166 of EcTonB and the negative charge of Glu56 of FhuA receptor is proposed to exist involved in the disruption of the plug domain (Pawelek et al., 2006).

Interestingly, several groups believe reported discrete conformations of the differently dissected CTD of TonB protein from E. coli solved by X-ray crystallography or NMR spectroscopy (Fig. 1C). The crystal structures of E. coli TonB-CTD consisting of the last 85 or 77 residues were composed of an intertwined dimer conformation with three β-strands and one α-helix (PDB codes: 1IHR and 1QXX, respectively) (Chang et al., 2001; Koedding et al., 2004). Whereas a longer construct consisting of the last 92 residues (EcTonB-92) was monomeric in solution, the crystal structure revealed dimerization via β-strands in the C-terminus (PDB: 1U07) (Ködding et al., 2005). Furthermore, TonB protein from E. coli (EcTonB-137, PDB code: 1XX3) was monomeric as observed in solution NMR experiments (Peacock et al., 2005). CTDs of EcTonB bound to outer membrane receptors BtuB and FhuA bewitch a monomeric conformation (Shultis et al., 2006; Pawelek et al., 2006). Therefore, the biological relevance of the intertwined dimers institute in the crystal structures of the shorter fragments of CTDs manner the last 85 or 77 residues has not been lucid (Ködding et al., 2005; Koedding et al., 2004; Postle et al., 2010). In contrast, Electron Spin Resonance (EPR) experiments suggested that a significant population of TonB exists as a dimer in solution while the monomeric shape is bound to a TBDT (Freed et al., 2013). The major differences among the monomeric structures of EcTonB are observed around the residues 235–239 (highlighted in red) at the C-terminal region (Fig. 1C). Whereas these residues in the NMR structure of EcTonB-137 fold to an additional β-strand (β6) and forming an anti-parallel sheet with the preceding β5-strand, the same C-terminal terminate is either extended or largely invisible in the crystal structures (Fig. 1C). Intriguingly, β5-strand (residues 226–231) in EcTonB-CTD directly interacts with TonB box of TBDTs in the crystal structures of EcTonB-CTD/TBDT complexes (Pawelek et al., 2006; Shultis et al., 2006). The β5-strand is not accessible for the proposed interaction in the NMR structures of EcTonB-137 (Peacock et al., 2005) due to the additional β6-strand. Therefore, β6-strand in EcTonB-137 NMR structure has to exist exchanged with the strand in TonB box when interacting with TBDTs (Peacock et al., 2005). In contrast, the recent solution NMR structure of the last 92 residues from Helicobacter pyroli TonB (HpTonB-92) showed the disordered C-terminal region and the absence of β6-strand (Ciragan et al., 2016), which is more in line with the crystal structures of EcTonB-CTD reported previously (Ködding et al., 2005; Shultis et al., 2006;Pawelek et al., 2006).

Here, they report the NMR structure and MD simulations of a CTD of TonB protein from Pseudomonas aeruginosa (PaTonB-96) to investigate whether the plasticity of the C-terminal region observed for the reported structures of EcTonB is a common feature of TonBs across different organisms.

Materials and Methods NMR sample preparation

The C-terminal 96 residues of a TonB protein from P. aeruginosa (UniProt: Q51368) was cloned from genomic DNA (ATCC-47085) as an N-terminal SUMO fusion protein, which was previously termed PsTonB-96 (Guerrero, Ciragan & Iwaï, 2015). The construct expresses a His-tag SUMO fusion protein that produces a 99-residue protein after the SUMO tag removal, which they termed PaTonB-96. PaTonB-96 contains the last 96 residues of PaTonB (247–342) and three residues (SHM) at the N-terminal terminate from the cloning site. The plasmid (pFGRSF15) coding the gene of PaTonB-96 was transformed into E. coli ER2566 strain (New England Biolabs, Ipswich, MA, USA) for production of doubly 15N, 13C-labeled samples. The transformed E. coli cells were grown overnight at 30 °C in 50 mL LB medium supplemented with 25 μg/mL kanamycin. The cells were spun down at 900 × g for 15 min and gently re-suspended in two L pre-warmed M9 medium supplemented with 25 μg/mL kanamycin, containing 15NH4Cl and 13C6-D-glucose as sole nitrogen and carbon sources, respectively. The cells were grown at 37 °C until an OD600 of 0.6. Then, the temperature was lowered to 30 °C for protein expression. The protein expression was induced with a final concentration of one mM isopropyl β-D-1-thiogalactopyranoside (IPTG). The cells were incubated for additional 5 h before harvesting by centrifugation at 4,900 × g at 4 °C for 15 min. The labeled PaTonB-96 was purified following the previously published protocol (Guerrero, Ciragan & Iwaï, 2015). The purified protein was dialyzed against 20 mM sodium phosphate buffer (pH 6.0). The protein solution of PaTonB-96 was concentrated to one mM for NMR analysis using a centrifugal device. The final sample volume was 250 μL containing 10% D2O.

NMR measurements

NMR measurements for the structure determination were recorded on Varian INOVA 800 MHz equipped with a cryogenically cooled five mm probe head. For the sequential backbone assignment, a gauge set of double and triple resonance NMR spectra were recorded at 25 °C, including [1H, 15N]-HSQC, HNCO, HNCA, HNCACB, HN(CO)CA, HN(CA)CO, and CBCA(CO)NH (Sattler, Schleucher & Griesinger, 1999). The aliphatic side-chain assignment was carried out using [1H, 13C]-HSQC, HCCH-COSY, ct-[1H, 13C]-HSQC, HBHA(CO)NH, H(CCCO)NH, (H)CC(CO)NH, 15N-resolved [1H, 1H]-TOCSY, and 15N-edited [1H-1H]-NOESY spectra. The assignments for the aromatic side-chains were based on the spectra of (HB)CB(CGCD)HD, (HB)CB(CGCDCE)HE, aromatic region ct-[1H, 13C]-HSQC and 13C-edited [1H,1H]-NOESY. Data was acquired using VnmrJ (Varian Inc., Palo Alto, CA, USA) and data were processed using the NMRpipe software (Delaglio et al., 1995).

NMR measurements for the backbone dynamics were recorded on a Bruker Avance 850 MHz equipped with a cryogenically cooled probe head. The longitudinal (T1) and transverse (T2) relaxation rates and 15N{1H}-heteronuclear nuclear Overhauser effects (NOEs) for backbone 15N atoms were determined at 25 °C using the well-established NMR experiments (Barbato et al., 1992; Kay, Torchia & Bax, 1989). T1(15N) and T2(15N) relaxation times were determined using the following delay times: 10, 50, 100, 200, 300, 500, 800, 1,000, 1,200, and 2,000 ms for T1 and 16, 64, 96, 128, 156, 196, 224, and 256 ms for CMPG pulse train with one ms interval for T2 relaxation rates, respectively. Relaxation times were obtained by fitting a single exponential decay to peak intensity values: I(t) = I0 × exp (–t/T1) or I0 × exp (−t/T2), where I(t) is the peak volume at a time t. Heteronuclear 15N{1H}-NOEs were obtained with a relaxation delay of 5 s with or without saturation of protons. Heteronuclear 15N{1H}-NOEs (η) were determined from the volumes of the HSQC signals using the ratio of η = I/I0. The relaxation data were processed and analyzed using Bruker Dynamic center (Version 2.1.8; Bruker Inc., Billerica, MA, USA).

Solution NMR structure determination

The sequence-specific resonance assignment was performed with gauge methods using triple resonance NMR experiments and CcpNmr Analysis software (version 2.4.1) (Vranken et al., 2005). The chemical shift values from the sequential resonance assignment were used together with NOE peak lists for the structure calculation with the program CYANA 3.0 (Mumenthaler et al., 1997; Güntert & Buchner, 2015). NOE distance restraints were obtained from 3D 15N- and 13C-edited [1H, 1H]-NOESY spectra with 80-ms mixing time. The conformations of prolines were checked based on CB-CG chemical shift before the structure calculation (Schubert et al., 2002). entire prolines were predicted to exist in trans conformation except P299 that was set to cis-conformation. The three-dimensional NMR conformers were generated using CYANA 3.0, based on the automated NOESY cross peaks assignment (Güntert, 2004; Güntert, Mumenthaler & Wüthrich, 1997). The restrained energy minimization of the final 20 best conformers was performed using AMBER 14 (Pearlman et al., 1995), and the structures were validated with PSVS 1.5 (Bhattacharya, Tejero & Montelione, 2007). The structural statistics are summarized in Table 1.

Table 1:

Structural statistics of the energy-minimized NMR structure of PaTonB-96.

PaTonB-96a Completeness of resonance assignments (%)b Backbone 98.5 Side chain, aliphatic 97.0 Side chain, aromatic 88.0 Distance restraints Total 1,698 Intraresidue (i = j) 465 Sequential (|i−j| = 1) 483 Medium ambit (1 < |i−j| < 5) 198 Long ambit (|i−j| ≥ 5) 552 No. of restraints per residue 17.2 No. of long-range restraints per residue 5.6 Residual restraint violations Average no. of distance violation per structure 0.1–0.2 Å 1 >0.2 Å 0 (max. 0.14) Average no. of dihedral angle violations per structure >2.5° 0 Model qualityc Rmsd backbone atoms (Å) 1.0 Rmsd weighty atoms (Å) 1.6 Rmsd bond lengths (Å) 0.014 Rmsd bond angles (°) 2.1 MolProbity Ramachandran statisticsc Most favored regions (%) 97.4 Allowed regions (%) 2.5 Disallowed regions (%) 0.1 Global trait scores (raw/Z score)c Verify3D 0.34/−1.93 ProsaII 0.41/−0.99 PROCHECK (ϕ–ψ) −0.27/−0.75 PROCHECK (all) −0.23/−1.36 MolProbity clash score 0.18/1.49 Model contents Ordered residue ranges 247–258, 261–320, 323–338 Total no. of residues 99 BMRB accession number 34235 PDB ID code 6FIP MD simulation

The MD simulations were performed with Gromacs5 (Abraham et al., 2015) by using Amber ff99SB-ILDN force field and tip4p water model (Jorgensen et al., 1983; Lindorff-Larsen et al., 2010). The first 10 ns from total 400-ns simulation was considered to exist the equilibrium period by monitoring the protein root-mean-square-deviation, inertia tensor eigenvalues, and rotation angles. The rest was used for the analysis since the first 10 ns of simulation trajectories was sufficiently enough to remove the significant fluctuations in these parameters (Ollila, Heikkinen & Iwaï, 2018). The NMR structure determined in this labor was used as the initial structure and the secondary structures remained unchanged during the entire simulation period. The temperature was coupled to 25 °C with v-rescale thermostat (Bussi, Donadio & Parrinello, 2007), and the pressure was isotropically set to one bar using Parrinello-Rahman barostat (Parrinello & Rahman, 1981). The time-step was two fs, Lennard-Jones interactions were cut-off at one nm, PME (Darden, York & Pedersen, 1993; Essmann et al., 1995) was used for electrostatics, and LINCS (Hess, 2008) was used to constrain entire bond lengths. The simulation data is available from the Zenodo repository (Ollila, 2018a).

The analysis and interpretation of 15N spin relaxation times are described in detail elsewhere (Ollila, Heikkinen & Iwaï, 2018). Briefly, rotational correlation functions of the backbone N–H bonds were calculated from the simulation data and the spin relaxation times were calculated using the Redfield equations (Abragam, 1961; Kay, Torchia & Bax, 1989; Ollila, Heikkinen & Iwaï, 2018). Before the spin relaxation time calculation, the overestimated overall rotational diffusion in the MD simulation due to the water model was corrected by dividing the rotational diffusion coefficients around entire inertia axes with a factor of 1.2, assuming that the protein rotates as an anisotropic rigid body. This scaling factor was institute to exist capable of reproducing the 15N spin relaxation times in suited agreement with the experimental data of PaTonB-96 for tip4p water model (Ollila, Heikkinen & Iwaï, 2018). The computer codes used for the analysis and the related data are available (Ollila, 2018b, 2018c).

Results NMR solution structure of PaTonB-96

The protein consisting of the C-terminal 96 residues of TonB from P. aeruginosa (PaTonB-96) was previously identified as a minimal domain that was soluble when expressed using an E. coli expression system, while other shorter fragments were not soluble even with several different fusion partners (Guerrero, Ciragan & Iwaï, 2015). This fragment has 45% identity (40/88 residues) to EcTonB-92, suggesting a similar structure to EcTonB. [1H, 15N]-HSQC spectrum of PaTonB-96 shows the well-dispersed NMR signals for amide groups (Fig. 2), indicating a globular folded conformation. entire of the main-chain chemical shifts were assigned except for S244 and HN of H245. 95.2% of the expected side-chains were assigned. The assigned chemical shifts were used for the automatic analysis of NOE peaks with the CYANA to calculate the NMR structure. figure 3 shows the lowest energy solution NMR structure of PaTonB-96 with the secondary structure elements and a superposition of the 20 lowest energy conformers. The structural statistics of the 20 NMR conformers are summarized in Table 1. PaTonB-96 adopts a mixed α/β structure with the topology of βαββαββ. The structure consists of a β-sheet composed of three anti-parallel β-strands (β2, β3, and β5), a β-sheet composed of two short β-strands (β1 and β4) and two short α-helices (αI and αII). The structural coordinates and the chemical shifts believe been deposited in the Protein Data Bank (http://www.rcsb.org/, PDB code: 6FIP) and BMRB (http://www.bmrb.wisc.edu/, accession number: 34235).

Figure 2: Two-dimensional [1H, 15N]-HSQC spectrum of one mM PaTonB-96. The spectrum was recorded at the 1H frequency of 800 MHz at 25 °C. The residue number and single letter code for amino acid types witness the assignments. Trp HNe, Gln and Asn side chain amide resonances are marked by “sc.” Figure 3: NMR structures of PaTonB-96. (A) Ribbon drawings of the lowest energy conformer of the PaTonB-96 structures showing the secondary structure elements. (B) Stereoview of an ensemble of the 20 lowest energy NMR conformers. Red and blue color are used for α-helices and β-sheets, respectively. N and C witness N- or C-termini, respectively. Figures are generated with PyMol (Schrodinger, 2015). Comparison of the NMR structures between E. coli and P. aeruginosa

The primary and secondary structures of PaTonB-96 were compared with the structure of EcTonB-137 (PDB: 1XX3) (Peacock et al., 2005) (Fig. 4). The length of PaTonB-96 is similar to that of the globular fragment of EcTonB-137 (88 residues). Notable structural differences are observed around the C-terminal end. The C-terminal terminate of EcTonB-137 forms an anti-parallel β-strand (β6) with β5-strand to constitute a β sheet. In contrast, the C-terminal terminate in PaTonB-96 is unstructured and exhibits an extended resilient conformation as moreover seen from the spin relaxation data (Fig. 5). The dissimilarity can exist easily explained by the shorter C-terminal terminate after the β5-sheet in PaTonB-96, being too short to shape an additional β-strand. The shorter C-terminal terminate in PaTonB-96 is compensated by the longer loop between β4 and β5-strands with additional five residues, compared with the structured 88-residue region of EcTonB-137. Higher mobility of this longer loop is moreover confirmed by the 15N relaxation measurement and MD simulation (Fig. 5). Interestingly, the extended and disordered conformation of the C-terminal terminate in PaTonB-96 more closely resembles the crystal structures of EcTonB-92 (PDB: 1U07) or the structures from TonB/TBDT complexes (PDB: 2GRX and 2GSK) (Fig. 1). The interaction between β5-strand of TonB and the TonB box in TBDTs has been proposed to exist essential for the TonB-mediated energy transfer (Pawelek et al., 2006; Shultis et al., 2006). Such interaction would exist hindered by the additional β6-stand institute in EcTonB-137. Thus, their results insinuate that β5-strand is more accessible for the proposed interactions with TonB box in PaTonB-96 where the β6-strand is absent.

Figure 4: Comparison between PaTonB-96 and EcTonB-137. (A) The sequence comparison between PaTonB-96 and the last 90 residues of EcTonB-137 with the secondary structure elements. (B) Stereoview of the superposition of the 20 NMR structures of PaTonB-96 (gray) and residues 151–239 of the 20 NMR structures of EcTonB-137 (PDB: 1XX3, blue). N and C stand for the N- and C-termini, respectively. Figure 5: MD simulation of PaTonB-96 and comparison with the experimental data. (A) The comparison of the experimental and simulated 15N relaxation parameters and the internal motions presented by S2 and te obtained from the MD simulation. The regions for β-sheets, αI, and αII are highlighted in blue, purple, and orange, respectively. (B) A superposition of snapshots of the structure from the MD simulation trajectory indicating conformational fluctuations during the MD simulation. The residues with enhanced flexibilities are colored in yellow. The aI-helix with orientation fluctuations is colored in purple. Rotational diffusion coefficient values obtained from the MD simulation of the experimental spin relaxation data are, Dxx = 1.51 ± 0.01, Dyy = 1.72 ± 0.03, and Dyy = 3.79 ± 0.03 (rad2·107/s). These result in Dav = (Dxx + Dyy + Dzz)/3 = 2.3 ± 0.02 (rad2·107/s), τc = (6Dav)–1 = 7.2 ± 0.02 (ns), A = 2Dzz−(Dyy + Dxx) = 4.4 and R = Dyy−Dxx = 0.2, where A is the axiality and R is the rhombicity. The overlay of the trajectories was produced by vmd (Humphrey, Dalke & Schulten, 1996). Structural motions in PaTonB-96

Fast dynamics (picosecond to nanosecond) of proteins has been commonly investigated by measuring the spin relaxation times (T1, T2, and heteronuclear NOEs) of backbone 15N atoms (Jarymowycz & Stone, 2006; Van Den Bedem & Fraser, 2015). Here, they characterize the structural dynamics of PaTonB-96 by combining T1, T2, and heteronuclear NOEs for backbone 15N atoms and MD simulations (Ollila, Heikkinen & Iwaï, 2018). The measured spin relaxation times for PaTonB-96 are shown together with the MD simulation results (Fig. 5A). The suited agreement with the experimental data allows us to utilize the MD simulation trajectory to interpret the timescales for the overall rotational diffusion (τc), efficient correlation times for internal mobility (τeff), and order parameters (S2). The overall rotational diffusion coefficients around inertia axes (see the caption of Fig. 5) note that PaTonB-96 has elevated axiality (A = 4.4), but with a rather low rhombicity (R = 0.2) suggesting that the protein has an approximately ellipsoidal shape. The MD simulation analysis estimates τc = 7.2 ns for the timescale of uninterested overall rotational diffusion. This is in line with 6.9 ns estimated from the T1/T2 values using the model-free approach (Kay, Torchia & Bax, 1989; Ollila, Heikkinen & Iwaï, 2018) as well as with the values in the literature for monomeric proteins with the similar molecular weight (Krishnan & Cosman, 1998). They thus conclude that PaTonB-96 is monomeric in solution as was the previously published NMR structure for EcTonB-137 (Peacock et al., 2005).

The results betray that there are four regions with enhanced internal motions in PaTonB-96 (Fig. 5). The regions with notable conformational fluctuations are colored in yellow and purple in the overlaid snapshots from the MD simulation (Fig. 5). The first few N-terminal residues exhibit low order parameters and long efficient correlations times related to the enhanced conformational fluctuations, suggesting that the N-terminal region is already the genesis of the resilient central region of the TonB protein that connects between TM region and CTD. The MD simulation revealed orientational fluctuations in αI helix (purple in Fig. 5B). This fluctuation moreover influenced the order parameters and efficient correlation times of the neighboring residues in the MD simulation (Fig. 5A). However, the changes were not observed in the 15N spin relaxation analysis, presumably because the 15N relaxation is not sensitive to the time scale of the fluctuation. Residues 320–326 in the loop between β4 and β5-strands witness some enhanced conformational fluctuations, which were moreover detectable by the 15N spin relaxation analysis and order parameters but does not move the efficient correlation times (Fig. 5A). The last five residues of the C-terminal terminate (residues 338–342) showed the enhanced conformational fluctuations, characterized with lower order parameters, long efficient correlation times, and changes in the 15N spin relaxation rates, which are consistent with the experimental 15N spin relaxation data. The resilient residues at the C-terminal terminate are in near contact with the αI helix, indicating orientational fluctuations as described above.

Modelling of PaTonB and TonB box interactions

It is believed that TonB conveys the CM chemical potential to TBDTs by structural changes via the interaction between CTD of TonB and TonB box, a short stretch of peptide chain in the N-terminus of plug domain of TBDTs (Cadieux & Kadner, 1999; Pawelek et al., 2006; Peacock et al., 2005; Shultis et al., 2006) (Fig. 1A). In the crystal structure of EcTonB-93/BtuB complex, EcTonB orients the αI helix against the plug domain and forms a parallel β-sheet interaction with the TonB box of BtuB (Shultis et al., 2006) (Fig. 6A). They created a hypothetical model of a tangled between PaTonB-96 and TBDT by superimposing PaTonB-96 to residues 153–233 of EcTonB in the crystal structure of the tangled because no structure of TBDTs from P. aeruginosa is available (Fig. 6B). β5-strand (residues 226–231) of EcTonB-93 and TonB box of BtuB forms the parallel β-strands, of which interactions are mostly hydrophobic (Fig. 6C). The modeled structure of PaTonB-96/BtuB tangled indeed resembles the conserved TonB box interactions observed with the EcTonB/BtuB complex, supporting that the modeled structure is plausible. The highly conserved Val10 in the TonB box is located next to phenylalanine in both TonB structures (Phe230 and Phe336 in EcTonB-93 and PaTonB-96, respectively), suggesting that this hydrophobic interaction might exist faultfinding for the TonB/TBDT complexes (Fig. 6C).

Figure 6: Models for interactions between TonB and TBDTs. (A) The crystal structure of EcTonB-93 (cyan) bound to BtuB transporter (green, PDB: 2GSK). (B) A cartoon model of the tangled of E. coli BtuB transporter and PaTonB-96 (gray) created by the superposition of CTDs of the TonB proteins. (C) Illustrations depicting the interactions between β5-strand of EcTonB-93 (cyan) or PaTonB-96 (gray) with the TonB box of BtuB transporter from E. coli (green). The consensus TonB box sequences based on 57 sequences from UniProtKB/Swiss-Prot (PROSITE: PS00430) is shown at the top. (D) Two hypothetical interaction models for PaTonB/TonB box from probable P. aeruginosa BtuB (Uniprot: Q9I473). White circles and dotted black circles witness exposed and buried sides of the model, respectively. Discussion

We are interested whether the structural features institute in TonB and TonB/TBDTs complexes from E. coli are shared among other Gram-negative organisms. In the modeled structure of PaTonB-96/EcBtuB complex, the positive charge at the genesis of β5-strand (Lys332 in PaTonB-96) could complement the negative charge of Asp6 in the TonB box, of which negative charge can exist institute in the half of the TonB box consensus motif from various Gram-negative organisms (Fig. 6C). This might insinuate that the positive-negative charge interaction could play an primary role in the specific recognition of TonB box. However, putative BtuB sequences from P. aeruginosa carry out not contain the exact consensus TonB box motif shown in Fig. 6C. Based on the observation from the model of PaTonB-96/EcBtuB complex, they searched a potential TonB box sequence in a putative BtuB sequence (PaBtuB) (Uniprot: Q9I473). They institute a stretch of the sequence “DQVVTATR” (residues 29–36) at the N-terminal region of the possible plug domain region, with which PaTonB might interact, and hypothesized two interaction models (Fig. 6D). In the model A, they assumed Val32 in the PaBtuB as the highly conserved Val in the TonB box motif. In this model, the negative charge of Asp29 could exist located in the vicinity of Lys332 and the sequence of “VVTA” is identical to the PaTonB-96/EcBtuB model. In the other model (model B), they considered Asp29 as the key residue in the alignment. The highly conserved Val in the TonB box is now replaced by Ala in this model, but the negative charge at Glu339 in PaTonB could exist better compensated by Arg36 in PaBtuB if the extended the last β-sheet of PaTonB.

It is noteworthy that similar interactions are not plausible for the solution NMR structure of EcTonB-137 due to the steric hindrance by the presence of an additional β6-strand. The β6-strand needs to exist disrupted and exchanged to the TonB box for the similar interaction as observed in the crystal structures of the two TonB/TBDT complexes (Pawelek et al., 2006; Shultis et al., 2006). The solution NMR structure of PaTonB-96 elucidated in this labor is accessible to the TonB box without the strand exchange, because the disordered and extended C-terminal terminate does not tamper with the interaction site. This open conformation at the C-terminus is moreover observed in the NMR structures of HpTonB-92 (Ciragan et al., 2016) and TonB-like protein, HasB from Serratia marcescens (Amorim et al., 2013). Thus it might exist a more common structure among CTDs of TonB proteins across different organisms.

Our hypothetical model of PaTonB-96 interactions with the TonB box and crystal structures of TonB/TBDT complexes suggests that αI–helix positions toward the plug domain located in the TBDT barrel (Fig. 6A) (Pawelek et al., 2006; Shultis et al., 2006). It was previously proposed that the positively charged Arg166 residue in αI–helix of EcTonB-CTD could interact with the negatively charged Glu56 in plug domain of FhuA receptor and disrupt its structure, thereby lowering the energy barrier required for the pore opening (Pawelek et al., 2006). Interestingly, the MD simulation detected orientational fluctuations of αI–helix in PaTonB-96 (Fig. 5), which moreover contains positively charged Arg271. Such fluctuations might further facilitate the proposed disruption due to the interactions between Arg271 in PaTonB and the negatively charged residues in the plug domain of TBDTs. The resilient loop between β4 and β5 strands institute in PaTonB-96 is located distantly from BtuB (Fig. 6B). Therefore, the modeled tangled of PaTonB/BtuB does not directly witness any structural role for this resilient loop.

Conclusions

We report the solution structure of PaTonB-96, which is largely similar to the previously reported monomeric NMR structure of EcTonB-137 (PDB code: 1XX3) (Peacock et al., 2005) except for the C-terminal end. Whereas the C-terminal region of NMR structures of EcTonB-137 formed an additional anti-parallel β6-strand with β5-strand, the C-terminal terminate of PaTonB-96 has extended resilient conformation, which resembles the crystal structures of TonB proteins interacting with TBDTs (Pawelek et al., 2006; Shultis et al., 2006). The absence of the last β6 strand in PaTonB-96 structure suggests that the β5-strand is more accessible for the interaction with TonB box than in EcTonB-137, for which the strand exchange is required. Furthermore, the structural model suggests that the electrostatic interactions between PaTonB-96 and TonB box might exist more propitious than for EcTonB. Based on the structural model, they identified a potential TonB box sequence in PaBtuB. They moreover speculate that the orientation fluctuations observed in the αI–helix of PaTonB-96 detected in MD simulation could lower the energy barrier of the suggested channel opening by disrupting the plug domain structure within the TBDT barrel when the C-terminus of TonB is bound to TonB box. The NMR structures and PaTonB-96 could thus usher further experimental analysis to unveil the structural basis of the mechanism of TonB-dependent energy transduction.

Supplemental Information

Eric S. Raymond Answers | killexams.com actual questions and Pass4sure dumps

This week's interview guest with Eric S. Raymond. They got a *lot* of suited questions, forwarded the moderators' favorites to Eric, and he not only answered the ones they sent him but - extra frosty - picked some more out of the horde and answered them, too. Read the complete session (below) and if you believe something you want to add, Go ahead. If Eric has time, he'll jump in and respond, because, well, he's just that benign of guy. ;) Note: questions marked with * are the ones Eric added to the moderators' selections.

chromatic asks:Astute readers know why you've reluctantly taken a position as a Linux evangelist, open source sociologist, and prime target. Taking the contradictory approach, is there anything which would convince you to step down, that your posts were no longer necessary?

This is not meant to exist inflammatory ... it's just a roundabout route of asking how far along your goals are, and what your plans will exist if you ever meet them.

ESR answers:Three things could antecedent me to step down:

  • One: someone emerging to carry out the public-advocate job clearly better than I do.
  • Two: Linux's market partake going over 50%. (Cool down, BSD guys -- I'd exist equally pleased to perceive some other open-source Unix win, it just doesn't seen very likely at this point).
  • Three: a collapse in Microsoft's stock price. That would spell the terminate of efficient FUD and countermarketing against open source.
  • ivo asks:A while ago, they read from you that being the Open Source advocate you are was wearing you down and influencing your life very badly. Did you slash down on advocating and did it help? In other words, did you rep your life back?

    ESR answers:Not really. Something more remarkable happened instead; the community responded to my distress convoke by growing up a little. I got letters of justification from some of the worst flamers. Many people in the rest of the community started pressuring the pinheads who had been making my job harder to shut up or rep constructive.

    I believe moreover slash down sort of on my travel schedule, but not as much as I thought earlier this year I would believe to. I'm moreover demanding (and getting) better travel conditions -- business class instead of the cheap seats in coach. It makes a difference, more of one than I would believe thought.

    Stephen Williams asks*:I'm cheerful to perceive that, after a three-year break, the Jargon File has been updated over the past few months. Is version 5.0.0 in the works? Are there any plans to release an update to the print version, The unusual Hacker's Dictionary, any time soon?

    ESR answers:I've discussed the possibility with people at O'Reilly. That might exist my second-to-next book, after "The Cathedral and the Bazaar" and before "The expertise Of Unix Programming" (which is about half-done now but could bewitch me another nine months to finish). Whether I Go with O'Reilly or the publisher of the previous editions (MIT Press) the fourth edition of TNHD seems likely to compass out next year sometime.

    Tom Christiansen asks:I don't know how to request this question without it sounding affection stirring the pot, but what about the growing chasm between free software (giftware) and GNU software (the viral kind, not the nice LGPL kind)? This is a actual issue for some people in some situations. consider about the many BSD resellers and vendors who believe custom packaging in highly competitive fields, affection video editing? Doesn't the friction pang everyone? Apple has turned to BSD not Linux, and the GPL is cited as one judgement why. This seems to exist devisive. There are no terminate of flamewars on /. and elsewhere, and the heat diminishes the light. What benign of reconciliation is possible? Or is "take no prisoners" just the route it has to work?

    ESR answers:I don't perceive a chasm there, Tom. After all, we're entire noiseless writing and exchanging code. We're entire using basically the same set of licenses. I don't consider there are properly two different movements at all, outside the imaginations of a few rather fanatical partisans on both sides.

    Here is the reality test: if you're running a project and someone sends you a patch, will you cease to enquire whether that person is a member of the revise faction before you apply it? I don't consider so...

    So despite the verbal fireworks and philosophical disputes, we're entire hackers together. What unites us is more primary than what divides us.

    Tet asks:You negate you want to live in a world where software doesn't suck. I couldn't correspond more. However, carry out you perceive closed source software on an open source OS as a step in the privilege direction, or just likely to exist a more stable platform on which to hasten your potentially bug-ridden software?

    ESR answers:Step in the privilege direction, definitely. As more and more infrastructure goes open, and the remaimning closed-source applications increasingly utilize it for leverage, the overall trait of the applications will Go up.

    planet_hoth*:Recent interest shown by large commercial tech companies (IBM, SGI, Sun) seems to signal a unusual chapter in the history of Linux. carry out you perceive the participation of these companies strengthening the linux communitity? Destroying it? Or transforming it into something completely different?

    ESR answers:Look around you. What carry out you see, compared to a year ago?

    Do you perceive fewer Linux hackers writing open source, or more? carry out you perceive fewer hackers getting *paid* to write open source, or more? I consider the reply is pretty clear.

    Do you perceive their designs, or their licenses, or their coding practices being changed in any significant route by corporate participation? Again, I consider the reply is pretty clear.

    The truth is, they're not transforming us. We're transforming them.

    asad asks*:I know that you are on the board of directors at VA Linux, what does your job entail?

    ESR answers:My job at VA mostly involves sitting in a board meeting once a month asking searching questions about what the solid is doing and why. My role there (as Larry Augustin describes it) is to exist the official corporate conscience. This mainly involves nipping substandard ideas in the bud, before they flower into something that would piss off the hacker community. I believe not had to carry out this often.

    shawnhargreaves asks:You've always been involved in hacker projects outside of just coding (eg. the Jargon File), but over the last year or so the spokesperson role seems to believe grown into a fulltime job. How long is it since you last sat down to write a major piece of software? carry out you anticipate to Go back to fulltime progress labor anytime soon, and if so, what would you labor on? How carry out you manage to cope with the withdrawal symptoms?

    ESR answers:An astute question ;-). I haven't sat down to write a major piece of software from scratch in months, but I am continuing to maintain fetchmail. I just took over the gif2png beta code with Greg Roelofs's consent; the 1.0.0 version might exist out by the time you read this. Today I did some labor on gnuplot, bringing the PNG driver up to date.

    If I rep to Go full-time again soon, I want to Go back to labor on Trove, the distributed web-based code-archiving system I designed last year. I'd moreover affection to labor with Guido van Rossum on Python 1.6; there are some long-time wishlist features affection flush comparisons and a full lambda facility that I care enough about to implement myself. I moreover believe a strategy-gaming system I wrote back in the 1980s that I'd affection to set a modern (Web-based) interface on. Finally, having contributed a bit of code to GNOME (the network-monitor applet) I'd affection to balance things by doing something for KDE.

    meersan asks:This has probably been asked before, but I can't recall seeing the reply to it anywhere. What originally led you to write The Cathedral and the Bazaar? -- what I'm interested in is if there was some event or impetus that prompted you to write it down. Obviously you'd believe no route of predicting the firestorm that followed, but it's always intriguing to know about the spark that started it all

    ESR answers:I wrote CatB as a route of coping with my astonishment in the visage of the Linux phenomenon. What I observed was that the community around Linux had evolved a route to write software that (a) was tremendously effective, (b) violated the classic Brooks's Law rules, and (c) was completely unconscious! Nobody reflected on what they were doing; it was rehearse without theory. I wrote CatB as an attempt to allay my tribe become more conscious about what it has been doing.

    Q*bert asks:We entire know that you are a staunch advocate of libertarianism. carry out you perceive the open-source / free-software movement turning into a larger political push for libertarian, minimal government?

    What conferences are you planning to attend this year? carry out you believe plans for organizing Geeks with Guns outings during them? If so, is there a mailing list or some other source of information about how to join?

    ESR answers:No remark on that first question. But, if you could perceive my face, I'm wearing a very evil grin....

    See my speaking calendar for the conferences I map to attend. As for GWG, there's no mailing list; would you affection to host one? I depend on local organizers to find a range, and I don't believe one for Atlanta Linux Showcase yet.

    banky asks:Linux, affection entire things in the computer world, will eventually become obsolete or maybe just too much labor to withhold "up to date". Linus (er, Dr. Torvalds) even said in his "Open Sources" essay that (paraphrasing) someone else could compass along and write something better which will bewitch Linux's place. How long carry out you consider before someone will believe an offering that will obsolete (or at least prove a competitor to) Linux and the BSD's?

    ESR answers:I doubt Linux will believe a actual technical competitor for a long time, because I consider it will probably just absorb unusual architectural ideas, amoeba-like, as they evolve. Twenty years from now the core APIs may believe grown and changed tremendously, but we'll noiseless consider of it as the `same' codebase and convoke it Linux :-).

    scumdamn asks:Is the friction between Gnome and KDE, BSD and GPL, Free Software and Open Source, and the other sources of flame war a substandard thing or a suited thing for the movement? Many people look to feel that the competition is devisive, but isn't it the opposite? We're always preaching that competition is a suited thing for the entire market, but then they complain when any of their pet projects are pitted head to head with another. The zeal felt by the proponents of each philosophy seems to result in better, more trait work. Isn't this proof that competition is the suited Thing we've been epigram it is entire along?

    ESR answers:I consider you answered your own question :-).

    cemerson asks:Which of the coders working on open source projects carry out you admire the most? A particular ample appellation affection Linus, or someone less well-known?

    ESR answers:Hmmm. I don't consider there's anyone I can negate I admire the most. There's a flat of ability beyond which trying to obtain comparisons between people just gets silly, because each of the people that suited has become a sort of consummate master of his own domain. Linus. RMS. Larry Wall. Guido van Rossum. James Gosling. Going further back, Ken Thompson or Dennis Ritchie. Anyway, I find these guys believe gotten their fill of being admired, so I try to exist friends with them instead.

    K asks:Why isn't there an entry for "free software" in the Jargon Dictionary? Was this a politically-motivated decision?

    ESR answers:Zounds! You know, until this moment, I didn't realize that entry was missing.

    I don't consider you want me to write it, though. I would find it difficult to avoid using phrases affection "rhetorical millstone around their necks" and "held us back for fifteen years". care to submit one yourself?

    Paul Crowley asks:In Understand my job, please! you described Bruce Perens's proposal that they believe a team of Linux advocates sharing the load as "glib". Could you negate more about why you feel this route - isn't it more likely that a job where the load is shared would exist more attractive?

    ESR answers:I consider I answered that question in the same paragraph you quoted. What makes the job harsh isn't the workload, it's the second-guessers and snipers from the sidelines -- among whom Bruce was, at the time, nearly the worst. Connect the dots yourself.

    jflynn asks:Starting an open source project from nothing but people with a common interest is difficult. It's been my undergo that it is very effortless to founder with a bazaar approach to architecture and design. The issues mind to rep confused with pious wars about toolkits and license choice, and just a lot of differing opinions about how to best structure a program, no one of which may exist *obviously* better.

    Is it essential for individuals to first create a working model, incomplete and buggy it may be, before applying bazaar development? Or what would you insinuate in terms of managing a bazaar approach to creating programs from a bare idea?

    ESR answers:I wouldn't. I consider you're right; the successful projects believe a core of individual vision around which the bazaar community nucleates.

    elutfall asks*:Since, as they entire know, cheese is the most powerful burden in the universe, I was wondering what your favorite source of ultimate power is?

    ESR answers:That would believe to exist sex, because I'm allergic to cheese.

    --

    Next week: Bruce Sterling.



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