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<StructureSection load='1rio' size='340' side='right'caption='[[1rio]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
<StructureSection load='1rio' size='340' side='right'caption='[[1rio]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1rio]] is a 5 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_25104 Atcc 25104] and [http://en.wikipedia.org/wiki/Bacteriophage_lambda Bacteriophage lambda]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1RIO OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=1RIO FirstGlance]. <br>
<table><tr><td colspan='2'>[[1rio]] is a 5 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_virus_Lambda Escherichia virus Lambda] and [https://en.wikipedia.org/wiki/Thermus_aquaticus Thermus aquaticus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1RIO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1RIO FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=MPD:(4S)-2-METHYL-2,4-PENTANEDIOL'>MPD</scene></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]] 2.3&#8491;</td></tr>
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=MPD:(4S)-2-METHYL-2,4-PENTANEDIOL'>MPD</scene>, <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1ku7|1ku7]], [[1lmb|1lmb]]</div></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=1rio FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1rio OCA], [https://pdbe.org/1rio PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1rio RCSB], [https://www.ebi.ac.uk/pdbsum/1rio PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1rio ProSAT]</span></td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CI ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10710 Bacteriophage lambda])</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=1rio FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1rio OCA], [http://pdbe.org/1rio PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1rio RCSB], [http://www.ebi.ac.uk/pdbsum/1rio PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1rio ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/RPC1_LAMBD RPC1_LAMBD]] Repressor protein CI allows phage lambda to reside inactively in the chromosome of its host bacterium. This lysogenic state is maintained by binding of regulatory protein CI to the OR and OL operators, preventing transcription of proteins necessary for lytic development. [[http://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=1rio 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=1rio ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The cI protein of bacteriophage lambda (lambdacI) activates transcription by binding a DNA operator just upstream of the promoter and interacting with the RNA polymerase sigma subunit domain 4 (sigma(4)). We determined the crystal structure of the lambdacI/sigma(4)/DNA ternary complex at 2.3 A resolution. There are no conformational changes in either protein, which interact through an extremely small interface involving at most 6 amino acid residues. The interactions of the two proteins stabilize the binding of each protein to the DNA. The results provide insight into how activators can operate through a simple cooperative binding mechanism but affect different steps of the transcription initiation process.
Structure of a ternary transcription activation complex.,Jain D, Nickels BE, Sun L, Hochschild A, Darst SA Mol Cell. 2004 Jan 16;13(1):45-53. PMID:14731393<ref>PMID:14731393</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1rio" style="background-color:#fffaf0;"></div>


==See Also==
==See Also==
*[[Bacteriophage repressor 3D structures|Bacteriophage repressor 3D structures]]
*[[Sigma factor 3D structures|Sigma factor 3D structures]]
*[[Sigma factor 3D structures|Sigma factor 3D structures]]
== References ==
== References ==
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__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Atcc 25104]]
[[Category: Escherichia virus Lambda]]
[[Category: Bacteriophage lambda]]
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Darst, S A]]
[[Category: Thermus aquaticus]]
[[Category: Hochschild, A]]
[[Category: Darst SA]]
[[Category: Jain, D]]
[[Category: Hochschild A]]
[[Category: Nickels, B E]]
[[Category: Jain D]]
[[Category: Sun, L]]
[[Category: Nickels BE]]
[[Category: Helix-turn-helix]]
[[Category: Sun L]]
[[Category: Transcription activation]]
[[Category: Transcription-dna complex]]

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