2i1q: Difference between revisions

Revision as of 06:34, 28 July 2008

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File:2i1q.png

Template:STRUCTURE 2i1q

RadA Recombinase in complex with CalciumRadA Recombinase in complex with Calcium

Template:ABSTRACT PUBMED 17050545

About this StructureAbout this Structure

2I1Q is a Single protein structure of sequence from Methanococcus voltae. Full crystallographic information is available from OCA.

ReferenceReference

Calcium stiffens archaeal Rad51 recombinase from Methanococcus voltae for homologous recombination., Qian X, He Y, Ma X, Fodje MN, Grochulski P, Luo Y, J Biol Chem. 2006 Dec 22;281(51):39380-7. Epub 2006 Oct 17. PMID:17050545

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OCA

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 {{STRUCTURE_2i1q|  PDB=2i1q  |  SCENE=  }}
-'''RadA Recombinase in complex with Calcium'''
+===RadA Recombinase in complex with Calcium===
-==Overview==
+<!--
-Archaeal RadA or Rad51 recombinases are close homologues of eukaryal Rad51 and DMC1. These and bacterial RecA orthologues play a key role in DNA repair by forming helical nucleoprotein filaments in which a hallmark strand exchange reaction between homologous DNA substrates occurs. Recent studies have discovered the stimulatory role by calcium on human and yeast recombinases. Here we report that the strand exchange activity but not the ATPase activity of an archaeal RadA/Rad51 recombinase from Methanococcus voltae (MvRadA) is also subject to calcium stimulation. Crystallized MvRadA filaments in the presence of CaCl(2) resemble that of the recently reported ATPase active form in the presence of an activating dose of KCl. At the ATPase center, one Ca(2+) ion takes the place of two K(+) ions in the K(+)-bound form. The terminal phosphate of the nonhydrolyzable ATP analogue is in a staggered conformation in the Ca(2+)-bound form. In comparison, an eclipsed conformation was seen in the K(+)-bound form. Despite the changes in the ATPase center, both forms harbor largely ordered L2 regions in essentially identical conformations. These data suggest a unified stimulation mechanism by potassium and calcium because of the existence of a conserved ATPase center promiscuous in binding cations.
+The line below this paragraph, {{ABSTRACT_PUBMED_17050545}}, adds the Publication Abstract to the page
+(as it appears on PubMed at http://www.pubmed.gov), where 17050545 is the PubMed ID number.
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+{{ABSTRACT_PUBMED_17050545}}
 ==About this Structure==
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 [[Category: Reca]]
 [[Category: Recombinase]]
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