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2f1h

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[[Image:2f1h.gif|left|200px]]
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{{STRUCTURE_2f1h| PDB=2f1h | SCENE= }}
{{STRUCTURE_2f1h| PDB=2f1h | SCENE= }}
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'''RECOMBINASE IN COMPLEX WITH AMP-PNP and Potassium'''
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===RECOMBINASE IN COMPLEX WITH AMP-PNP and Potassium===
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==Overview==
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Archaeal RadA/Rad51 are close homologues of eukaryal Rad51/DMC1. Such recombinases, as well as their bacterial RecA orthologues, form helical nucleoprotein filaments in which a hallmark strand exchange reaction occurs between homologous DNA substrates. Our recent ATPase and structure studies on RadA recombinase from Methanococcus voltae have suggested that not only magnesium but also potassium ions are absorbed at the ATPase center. Potassium, but not sodium, stimulates the ATP hydrolysis reaction with an apparent dissociation constant of approximately 40 mM. The minimal inhibitory effect by 40 mM NaCl further suggests that the protein does not have adequate affinity for sodium. The wild-type protein's strand exchange activity is also stimulated by potassium with an apparent dissociation constant of approximately 35 mM. We made site-directed mutations at the potassium-contacting residues Glu151 and Asp302. The mutant proteins are expectedly defective in promoting ATP hydrolysis. Similar potassium preference in strand exchange is observed for the E151D and E151K proteins. The D302K protein, however, shows comparable strand exchange efficiencies in the presence of either potassium or sodium. Crystallized E151D filaments reveal a potassium-dependent conformational change similar to what has previously been observed with the wild-type protein. We interpret these data as suggesting that both ATP hydrolysis and DNA strand exchange requires accessibility to an "active" conformation similar to the crystallized ATPase-active form in the presence of ATP, Mg2+ and K+.
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(as it appears on PubMed at http://www.pubmed.gov), where 16782126 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16782126}}
==About this Structure==
==About this Structure==
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[[Category: Reca]]
[[Category: Reca]]
[[Category: Recombinase]]
[[Category: Recombinase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 03:20:59 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 21:28:36 2008''

Revision as of 18:28, 27 July 2008

Image:2f1h.png

Template:STRUCTURE 2f1h

RECOMBINASE IN COMPLEX WITH AMP-PNP and Potassium

Template:ABSTRACT PUBMED 16782126

About this Structure

2F1H is a Single protein structure of sequence from Methanococcus voltae. Full crystallographic information is available from OCA.

Reference

Asp302 determines potassium dependence of a RadA recombinase from Methanococcus voltae., Qian X, He Y, Wu Y, Luo Y, J Mol Biol. 2006 Jul 14;360(3):537-47. Epub 2006 Jun 9. PMID:16782126

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