View source for 6xdr


==Escherichia coli transcription-translation complex B (TTC-B) containing an 27 nt long mRNA spacer, NusG, and fMet-tRNAs at E-site and P-site==
<StructureSection load='6xdr' size='340' side='right'caption='[[6xdr]], [[Resolution|resolution]] 4.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6xdr]] is a 11 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] 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=6XDR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6XDR 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]] 4.7&#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=6xdr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6xdr OCA], [https://pdbe.org/6xdr PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6xdr RCSB], [https://www.ebi.ac.uk/pdbsum/6xdr PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6xdr ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/RL21_ECOLI RL21_ECOLI] This protein binds to 23S rRNA in the presence of protein L20.[HAMAP-Rule:MF_01363]
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
In bacteria, transcription and translation are coupled processes in which the movement of RNA polymerase (RNAP)-synthesizing messenger RNA (mRNA) is coordinated with the movement of the first ribosome-translating mRNA. Coupling is modulated by the transcription factors NusG (which is thought to bridge RNAP and the ribosome) and NusA. Here, we report cryo-electron microscopy structures of Escherichia coli transcription-translation complexes (TTCs) containing different-length mRNA spacers between RNAP and the ribosome active-center P site. Structures of TTCs containing short spacers show a state incompatible with NusG bridging and NusA binding (TTC-A, previously termed "expressome"). Structures of TTCs containing longer spacers reveal a new state compatible with NusG bridging and NusA binding (TTC-B) and reveal how NusG bridges and NusA binds. We propose that TTC-B mediates NusG- and NusA-dependent transcription-translation coupling.

Structural basis of transcription-translation coupling.,Wang C, Molodtsov V, Firlar E, Kaelber JT, Blaha G, Su M, Ebright RH Science. 2020 Sep 11;369(6509):1359-1365. doi: 10.1126/science.abb5317. Epub 2020, Aug 20. PMID:32820061<ref>PMID:32820061</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6xdr" style="background-color:#fffaf0;"></div>

==See Also==
*[[RNA polymerase 3D structures|RNA polymerase 3D structures]]
*[[Ribosome 3D structures|Ribosome 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli]]
[[Category: Large Structures]]
[[Category: Synthetic construct]]
[[Category: Ebright RH]]
[[Category: Molodtsov V]]
[[Category: Su M]]
[[Category: Wang C]]