View source for 4xlp


==Crystal structure of T.aquaticus transcription initiation complex containing upstream fork promoter==
<StructureSection load='4xlp' size='340' side='right'caption='[[4xlp]], [[Resolution|resolution]] 4.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4xlp]] is a 16 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermus_aquaticus Thermus aquaticus] and [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4XLP OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4XLP FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></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=4xlp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4xlp OCA], [https://pdbe.org/4xlp PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4xlp RCSB], [https://www.ebi.ac.uk/pdbsum/4xlp PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4xlp ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/RPOA_THEAQ RPOA_THEAQ] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Initiation of transcription is a primary means for controlling gene expression. In bacteria, the RNA polymerase (RNAP) holoenzyme binds and unwinds promoter DNA, forming the transcription bubble of the open promoter complex (RPo). We have determined crystal structures, refined to 4.14 A-resolution, of RPo containing Thermus aquaticus RNAP holoenzyme and promoter DNA that includes the full transcription bubble. The structures, combined with biochemical analyses, reveal key features supporting the formation and maintenance of the double-strand/single-strand DNA junction at the upstream edge of the -10 element where bubble formation initiates. The results also reveal RNAP interactions with duplex DNA just upstream of the -10 element and potential protein/DNA interactions that direct the DNA template strand into the RNAP active site. Addition of an RNA primer to yield a 4 base-pair post-translocated RNA:DNA hybrid mimics an initially transcribing complex at the point where steric clash initiates abortive initiation and sigma(A) dissociation.

Structure of a bacterial RNA polymerase holoenzyme open promoter complex.,Bae B, Feklistov A, Lass-Napiorkowska A, Landick R, Darst SA Elife. 2015 Sep 8;4. doi: 10.7554/eLife.08504. PMID:26349032<ref>PMID:26349032</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4xlp" style="background-color:#fffaf0;"></div>

==See Also==
*[[RNA polymerase 3D structures|RNA polymerase 3D structures]]
*[[Sigma factor 3D structures|Sigma factor 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Synthetic construct]]
[[Category: Thermus aquaticus]]
[[Category: Bae B]]
[[Category: Darst SA]]