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1tjl

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{{STRUCTURE_1tjl| PDB=1tjl | SCENE= }}
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==Crystal structure of transcription factor DksA from E. coli==
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===Crystal structure of transcription factor DksA from E. coli===
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<StructureSection load='1tjl' size='340' side='right' caption='[[1tjl]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
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{{ABSTRACT_PUBMED_15294156}}
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1tjl]] is a 10 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_coli"_migula_1895 "bacillus coli" migula 1895]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TJL OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1TJL FirstGlance]. <br>
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</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ZN:ZINC+ION'>ZN</scene><br>
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<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">DksA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 "Bacillus coli" Migula 1895])</td></tr>
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<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1tjl FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1tjl OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1tjl RCSB], [http://www.ebi.ac.uk/pdbsum/1tjl PDBsum], [http://www.topsan.org/Proteins/RSGI/1tjl TOPSAN]</span></td></tr>
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<table>
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/tj/1tjl_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/chain_selection.php?pdb_ID=2ata ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Bacterial transcription is regulated by the alarmone ppGpp, which binds near the catalytic site of RNA polymerase (RNAP) and modulates its activity. We show that the DksA protein is a crucial component of ppGpp-dependent regulation. The 2.0 A resolution structure of Escherichia coli DksA reveals a globular domain and a coiled coil with two highly conserved Asp residues at its tip that is reminiscent of the transcript cleavage factor GreA. This structural similarity suggests that DksA coiled coil protrudes into the RNAP secondary channel to coordinate a ppGpp bound Mg2+ ion with the Asp residues, thereby stabilizing the ppGpp-RNAP complex. Biochemical analysis demonstrates that DksA affects transcript elongation, albeit differently from GreA; augments ppGpp effects on initiation; and binds directly to RNAP, positioning the Asp residues near the active site. Substitution of these residues eliminates the synergy between DksA and ppGpp. Thus, the secondary channel emerges as a common regulatory entrance for transcription factors.
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==Function==
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Regulation through the secondary channel--structural framework for ppGpp-DksA synergism during transcription.,Perederina A, Svetlov V, Vassylyeva MN, Tahirov TH, Yokoyama S, Artsimovitch I, Vassylyev DG Cell. 2004 Aug 6;118(3):297-309. PMID:15294156<ref>PMID:15294156</ref>
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[[http://www.uniprot.org/uniprot/DKSA_ECOLI DKSA_ECOLI]] Transcription factor that acts by binding directly to the RNA polymerase (RNAP). Required for negative regulation of rRNA expression and positive regulation of several amino acid biosynthesis promoters. Also required for regulation of fis expression. Binding to RNAP disrupts interaction of RNAP with DNA, inhibits formation of initiation complexes, and amplifies effects of ppGpp and the initiating NTP on rRNA transcription. Inhibits transcript elongation, exonucleolytic RNA cleavage and pyrophosphorolysis, and increases intrinsic termination. Also involved, with RecN, in repair of DNA double-strand breaks.<ref>PMID:15294157</ref> <ref>PMID:15948952</ref> <ref>PMID:16885445</ref> <ref>PMID:22210857</ref> <ref>PMID:15294156</ref>
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==About this Structure==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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[[1tjl]] is a 10 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_coli"_migula_1895 "bacillus coli" migula 1895]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TJL OCA].
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</div>
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== References ==
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==Reference==
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<references/>
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<ref group="xtra">PMID:015294156</ref><references group="xtra"/><references/>
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__TOC__
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</StructureSection>
[[Category: Bacillus coli migula 1895]]
[[Category: Bacillus coli migula 1895]]
[[Category: Artsimovitch, I.]]
[[Category: Artsimovitch, I.]]

Revision as of 09:58, 3 October 2014

Crystal structure of transcription factor DksA from E. coli

1tjl, resolution 2.00Å

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