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<StructureSection load='1ku7' size='340' side='right'caption='[[1ku7]], [[Resolution|resolution]] 2.40&Aring;' scene=''>
<StructureSection load='1ku7' size='340' side='right'caption='[[1ku7]], [[Resolution|resolution]] 2.40&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1ku7]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Atcc_25104 Atcc 25104]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KU7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1KU7 FirstGlance]. <br>
<table><tr><td colspan='2'>[[1ku7]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermus_aquaticus Thermus aquaticus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KU7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1KU7 FirstGlance]. <br>
</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1ku2|1ku2]], [[1ku3|1ku3]]</div></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.4&#8491;</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1ku7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ku7 OCA], [https://pdbe.org/1ku7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ku7 RCSB], [https://www.ebi.ac.uk/pdbsum/1ku7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ku7 ProSAT]</span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1ku7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ku7 OCA], [https://pdbe.org/1ku7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ku7 RCSB], [https://www.ebi.ac.uk/pdbsum/1ku7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ku7 ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[https://www.uniprot.org/uniprot/Q9EZJ8_THEAQ Q9EZJ8_THEAQ]] Sigma factors are initiation factors that promote the attachment of RNA polymerase to specific initiation sites and are then released (By similarity).[RuleBase:RU000715]  
[https://www.uniprot.org/uniprot/SIGA_THEAQ SIGA_THEAQ] Sigma factors are initiation factors that promote the attachment of RNA polymerase to specific initiation sites and are then released. This sigma factor is the primary sigma factor during exponential growth.[HAMAP-Rule:MF_00963]<ref>PMID:11114902</ref> <ref>PMID:11931761</ref>
== Evolutionary Conservation ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
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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/main_output.php?pdb_ID=1ku7 ConSurf].
</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/main_output.php?pdb_ID=1ku7 ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The sigma subunit is the key regulator of bacterial transcription. Proteolysis of Thermus aquaticus sigma(A), which occurred in situ during crystallization, reveals three domains, sigma(2), sigma(3), and sigma(4), connected by flexible linkers. Crystal structures of each domain were determined, as well as of sigma(4) complexed with -35 element DNA. Exposed surfaces of each domain are important for RNA polymerase binding. Universally conserved residues important for -10 element recognition and melting lie on one face of sigma(2), while residues important for extended -10 recognition lie on sigma(3). Genetic studies correctly predicted that a helix-turn-helix motif in sigma(4) recognizes the -35 element but not the details of the protein-DNA interactions. Positive control mutants in sigma(4) cluster in two regions, positioned to interact with activators bound just upstream or downstream of the -35 element.
Structure of the bacterial RNA polymerase promoter specificity sigma subunit.,Campbell EA, Muzzin O, Chlenov M, Sun JL, Olson CA, Weinman O, Trester-Zedlitz ML, Darst SA Mol Cell. 2002 Mar;9(3):527-39. PMID:11931761<ref>PMID:11931761</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1ku7" style="background-color:#fffaf0;"></div>


==See Also==
==See Also==
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__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Atcc 25104]]
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Campbell, E A]]
[[Category: Thermus aquaticus]]
[[Category: Chlenov, M]]
[[Category: Campbell EA]]
[[Category: Darst, S A]]
[[Category: Chlenov M]]
[[Category: Muzzin, O]]
[[Category: Darst SA]]
[[Category: Olson, C A]]
[[Category: Muzzin O]]
[[Category: Sun, J L]]
[[Category: Olson CA]]
[[Category: Trester-Zedlitz, M L]]
[[Category: Sun JL]]
[[Category: Weinman, O]]
[[Category: Trester-Zedlitz ML]]
[[Category: Double-helix]]
[[Category: Weinman O]]
[[Category: Helix-turn-helix]]
[[Category: Transcription-dna complex]]

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