1l9z

<StructureSection load='1l9z' size='340' side='right' caption='[[1l9z]], [[Resolution|resolution]] 6.50&Aring;' scene=''>

<table><tr><td colspan='2'>[[1l9z]] is a 8 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_25104 Atcc 25104] and [http://en.wikipedia.org/wiki/Thermus_aquaticus Thermus aquaticus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1L9Z OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1L9Z FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">rpoD ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=271 ATCC 25104])</td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/DNA-directed_RNA_polymerase DNA-directed RNA polymerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.6 2.7.7.6] </span></td></tr>

<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1l9z FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1l9z OCA], [http://pdbe.org/1l9z PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1l9z RCSB], [http://www.ebi.ac.uk/pdbsum/1l9z PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1l9z ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/RPOZ_THEAQ RPOZ_THEAQ]] Promotes RNA polymerase assembly. Latches the N- and C-terminal regions of the beta' subunit thereby facilitating its interaction with the beta and alpha subunits.<ref>PMID:11158566</ref> [[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]

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== Publication Abstract from PubMed ==

The crystal structure of Thermus aquaticus RNA polymerase holoenzyme (alpha2betabeta'omegasigmaA) complexed with a fork-junction promoter DNA fragment has been determined by fitting high-resolution x-ray structures of individual components into a 6.5-angstrom resolution map. The DNA lies across one face of the holoenzyme, completely outside the RNA polymerase active site channel. All sequence-specific contacts with core promoter elements are mediated by the sigma subunit. A universally conserved tryptophan is ideally positioned to stack on the exposed face of the base pair at the upstream edge of the transcription bubble. Universally conserved basic residues of the sigma subunit provide critical contacts with the DNA phosphate backbone and play a role in directing the melted DNA template strand into the RNA polymerase active site. The structure explains how holoenzyme recognizes promoters containing variably spaced -10 and -35 elements and provides the basis for models of the closed and open promoter complexes.

 

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== References ==

[[Category: Atcc 25104]]

[[Category: DNA-directed RNA polymerase]]

[[Category: Campbell, E A]]

[[Category: Darst, S A]]

[[Category: Masuda, S]]

[[Category: Murakami, K S]]

[[Category: Muzzin, O]]

[[Category: Transcription-dna complex]]