View source for 4wub


==N-terminal 43 kDa fragment of the E. coli DNA gyrase B subunit grown from 100 mM KCl condition==
<StructureSection load='4wub' size='340' side='right'caption='[[4wub]], [[Resolution|resolution]] 1.75&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4wub]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4WUB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4WUB 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]] 1.75&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ANP:PHOSPHOAMINOPHOSPHONIC+ACID-ADENYLATE+ESTER'>ANP</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</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=4wub FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4wub OCA], [https://pdbe.org/4wub PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4wub RCSB], [https://www.ebi.ac.uk/pdbsum/4wub PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4wub ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/GYRB_ECOLI GYRB_ECOLI] DNA gyrase negatively supercoils closed circular double-stranded DNA in an ATP-dependent manner and also catalyzes the interconversion of other topological isomers of double-stranded DNA rings, including catenanes and knotted rings.<ref>PMID:12051843</ref> <ref>PMID:18642932</ref> <ref>PMID:20675723</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Four new crystal structures of the ATPase domain of the GyrB subunit of Escherichia coli DNA gyrase have been determined. One of these, solved in the presence of K(+), is the highest resolution structure reported so far for this domain and, in conjunction with the three other structures, reveals new insights into the function of this domain. Evidence is provided for the existence of two monovalent cation-binding sites: site 1, which preferentially binds a K(+) ion that interacts directly with the alpha-phosphate of ATP, and site 2, which preferentially binds an Na(+) ion and the functional significance of which is not clear. The crystallographic data are corroborated by ATPase data, and the structures are compared with those of homologues to investigate the broader conservation of these sites.

The role of monovalent cations in the ATPase reaction of DNA gyrase.,Hearnshaw SJ, Chung TT, Stevenson CE, Maxwell A, Lawson DM Acta Crystallogr D Biol Crystallogr. 2015 Apr;71(Pt 4):996-1005. doi:, 10.1107/S1399004715002916. Epub 2015 Mar 27. PMID:25849408<ref>PMID:25849408</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4wub" style="background-color:#fffaf0;"></div>

==See Also==
*[[Gyrase 3D Structures|Gyrase 3D Structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli K-12]]
[[Category: Large Structures]]
[[Category: Chung TT]]
[[Category: Hearnshaw SJ]]
[[Category: Lawson DM]]
[[Category: Maxwell A]]
[[Category: Stevenson CEM]]