View source for 7qxm


==Crystal structure of the Vibrio cholerae replicative helicase (DnaB)==
<StructureSection load='7qxm' size='340' side='right'caption='[[7qxm]], [[Resolution|resolution]] 3.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7qxm]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Vibrio_cholerae Vibrio cholerae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7QXM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7QXM 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]] 3.8&#8491;</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=7qxm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7qxm OCA], [https://pdbe.org/7qxm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7qxm RCSB], [https://www.ebi.ac.uk/pdbsum/7qxm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7qxm ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A085R2T8_VIBCL A0A085R2T8_VIBCL] Participates in initiation and elongation during chromosome replication; it exhibits DNA-dependent ATPase activity and contains distinct active sites for ATP binding, DNA binding, and interaction with DnaC protein, primase, and other prepriming proteins.[ARBA:ARBA00003574][RuleBase:RU362085]
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== Publication Abstract from PubMed ==
To enable chromosomal replication, DNA is unwound by the ATPase molecular motor replicative helicase. The bacterial helicase DnaB is a ring-shaped homo-hexamer whose conformational dynamics are being studied through its different 3D structural states adopted along its functional cycle. Our findings describe a new crystal structure for the apo-DnaB from Vibrio cholerae, forming a planar hexamer with pseudo-symmetry, constituted by a trimer of dimers in which the C-terminal domains delimit a triskelion-shaped hole. This hexamer is labile and inactive. We suggest that it represents an intermediate state allowing the formation of the active NTP-bound hexamer from dimers.

The apo-form of the Vibrio cholerae replicative helicase DnaB is a labile and inactive planar trimer of dimers.,Cargemel C, Walbott H, Durand D, Legrand P, Ouldali M, Ferat JL, Marsin S, Quevillon-Cheruel S FEBS Lett. 2022 May 14. doi: 10.1002/1873-3468.14403. PMID:35568982<ref>PMID:35568982</ref>

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

==See Also==
*[[Helicase 3D structures|Helicase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Vibrio cholerae]]
[[Category: Cargemel C]]
[[Category: Legrand P]]
[[Category: Quevillon-Cheruel S]]
[[Category: Walbott H]]