8q3o: Difference between revisions
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New page: '''Unreleased structure''' The entry 8q3o is ON HOLD Authors: Said, N., Hilal, T., Wahl, M.C. Description: Bacterial transcription termination factor Rho + pppGpp [[Category: Unrelease... |
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==Bacterial transcription termination factor Rho + pppGpp== | |||
<StructureSection load='8q3o' size='340' side='right'caption='[[8q3o]], [[Resolution|resolution]] 3.00Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[8q3o]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8Q3O OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8Q3O 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]] 3Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=0O2:GUANOSINE+5-(TETRAHYDROGEN+TRIPHOSPHATE)+3-(TRIHYDROGEN+DIPHOSPHATE)'>0O2</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=8q3o FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8q3o OCA], [https://pdbe.org/8q3o PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8q3o RCSB], [https://www.ebi.ac.uk/pdbsum/8q3o PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8q3o ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/RHO_ECOLI RHO_ECOLI] Facilitates transcription termination by a mechanism that involves rho binding to the nascent RNA, activation of rho's RNA-dependent ATPase activity, and release of the mRNA from the DNA template. RNA-dependent NTPAse which utilizes all four ribonucleoside triphosphates as substrates.[HAMAP-Rule:MF_01884] | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Bacterial RNA helicase rho is a genome sentinel that terminates synthesis of damaged and junk RNAs that are not translated by the ribosome. Co-transcriptional RNA surveillance by rho is essential for quality control of the transcriptome during optimal growth. However, it is unclear how bacteria protect their RNAs from overzealous rho during dormancy or stress, conditions common in natural habitats. Here we used cryogenic electron microscopy, biochemical, and genetic approaches to show that residue substitutions, ADP, or ppGpp promote hyper-oligomerization of Escherichia coli rho. Our results demonstrate that nucleotides bound at subunit interfaces control rho switching from active hexamers to inactive higher-order oligomers and extended filaments. Polymers formed upon exposure to antibiotics or ppGpp disassemble when stress is relieved, thereby directly linking termination activity to cellular physiology. Inactivation of rho through hyper-oligomerization is a regulatory strategy shared by RNA polymerases, ribosomes, and metabolic enzymes across all life. | |||
Transcription termination factor rho polymerizes under stress.,Wang B, Said N, Hilal T, Finazzo M, Wahl MC, Artsimovitch I bioRxiv [Preprint]. 2023 Aug 18:2023.08.18.553922. doi: , 10.1101/2023.08.18.553922. PMID:37645988<ref>PMID:37645988</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
[[Category: | <div class="pdbe-citations 8q3o" style="background-color:#fffaf0;"></div> | ||
[[Category: Said | == References == | ||
[[Category: | <references/> | ||
__TOC__ | |||
</StructureSection> | |||
[[Category: Escherichia coli]] | |||
[[Category: Large Structures]] | |||
[[Category: Hilal T]] | |||
[[Category: Said N]] | |||
[[Category: Wahl MC]] | |||
Latest revision as of 16:54, 9 July 2025
Bacterial transcription termination factor Rho + pppGpp
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