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==Cryo-EM structure of HK022 putRNA-associated E.coli RNA polymerase elongation complex==
<StructureSection load='7xue' size='340' side='right'caption='[[7xue]], [[Resolution|resolution]] 3.17&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7xue]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12] and [https://en.wikipedia.org/wiki/Escherichia_virus_HK022 Escherichia virus HK022]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7XUE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7XUE FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.17&#8491;</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=7xue FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7xue OCA], [https://pdbe.org/7xue PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7xue RCSB], [https://www.ebi.ac.uk/pdbsum/7xue PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7xue ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/RPOA_ECOLI RPOA_ECOLI] DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. This subunit plays an important role in subunit assembly since its dimerization is the first step in the sequential assembly of subunits to form the holoenzyme.[HAMAP-Rule:MF_00059]
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Transcription, in which RNA polymerases (RNAPs) produce RNA from DNA, is the first step of gene expression. As such, it is highly regulated either by trans-elements like protein factors and/or by cis-elements like specific sequences on the DNA. Lambdoid phage HK022 contains a cis-element, put, which suppresses pausing and termination during transcription of the early phage genes. The putRNA transcript solely performs the anti-pausing/termination activities by interacting directly with the E.coli RNAP elongation complex (EC) by an unknown structural mechanism. In this study, we reconstituted putRNA-associated ECs and determined the structures using cryo-electron microscopy. The determined structures of putRNA-associated EC, putRNA-absent EC, and sigma(70)-bound EC suggest that the putRNA interaction with the EC counteracts swiveling, a conformational change previously identified to promote pausing and sigma(70) might modulate putRNA folding via sigma(70)-dependent pausing during elongation.

Structural basis of transcriptional regulation by a nascent RNA element, HK022 putRNA.,Hwang S, Olinares PDB, Lee J, Kim J, Chait BT, King RA, Kang JY Nat Commun. 2022 Aug 15;13(1):4668. doi: 10.1038/s41467-022-32315-y. PMID:35970830<ref>PMID:35970830</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7xue" style="background-color:#fffaf0;"></div>

==See Also==
*[[RNA polymerase 3D structures|RNA polymerase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli K-12]]
[[Category: Escherichia virus HK022]]
[[Category: Large Structures]]
[[Category: Hwang SH]]
[[Category: Kang JY]]