View source for 1xpo


==Structural mechanism of inhibition of the Rho transcription termination factor by the antibiotic bicyclomycin==
<StructureSection load='1xpo' size='340' side='right'caption='[[1xpo]], [[Resolution|resolution]] 3.15&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1xpo]] is a 12 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=1XPO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1XPO FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.15&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=AGS:PHOSPHOTHIOPHOSPHORIC+ACID-ADENYLATE+ESTER'>AGS</scene>, <scene name='pdbligand=BCM:BICYCLOMYCIN'>BCM</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=1xpo FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1xpo OCA], [https://pdbe.org/1xpo PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1xpo RCSB], [https://www.ebi.ac.uk/pdbsum/1xpo PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1xpo 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]
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/xp/1xpo_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1xpo ConSurf].
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== Publication Abstract from PubMed ==
Rho is a hexameric RNA/DNA helicase/translocase that terminates transcription of select genes in bacteria. The naturally occurring antibiotic, bicyclomycin (BCM), acts as a noncompetitive inhibitor of ATP turnover to disrupt this process. We have determined three independent X-ray crystal structures of Rho complexed with BCM and two semisynthetic derivatives, 5a-(3-formylphenylsulfanyl)-dihydrobicyclomycin (FPDB) and 5a-formylbicyclomycin (FB) to 3.15, 3.05, and 3.15 A resolution, respectively. The structures show that BCM and its derivatives are nonnucleotide inhibitors that interact with Rho at a pocket adjacent to the ATP and RNA binding sites in the C-terminal half of the protein. BCM association prevents ATP turnover by an unexpected mechanism, occluding the binding of the nucleophilic water molecule required for ATP hydrolysis. Our data explain why only certain elements of BCM have been amenable to modification and serve as a template for the design of new inhibitors.

Structural mechanism of inhibition of the Rho transcription termination factor by the antibiotic bicyclomycin.,Skordalakes E, Brogan AP, Park BS, Kohn H, Berger JM Structure. 2005 Jan;13(1):99-109. PMID:15642265<ref>PMID:15642265</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1xpo" style="background-color:#fffaf0;"></div>

==See Also==
*[[Helicase 3D structures|Helicase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli]]
[[Category: Large Structures]]
[[Category: Berger JM]]
[[Category: Brogan AP]]
[[Category: Kohn H]]
[[Category: Park BS]]
[[Category: Skordalakes E]]