3ew9

RADA recombinase from METHANOCOCCUS MARIPALUDIS in complex with AMPPNP and potassium ions

spinqualitylabelsall models 3ew9, resolution 2.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3ew9 is a 1 chain structure with sequence from Methanococcus maripaludis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.4Å Ligands: ANP, K, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function RADA_METMI Involved in DNA repair and in homologous recombination. Binds and assemble on single-stranded DNA to form a nucleoprotein filament. Hydrolyzes ATP in a ssDNA-dependent manner and promotes DNA strand exchange between homologous DNA molecules.[HAMAP-Rule:MF_00348] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Archaeal RadAs are close homologues of eukaryal Rad51s ( approximately 40% sequence identity). These recombinases promote ATP hydrolysis and a hallmark strand-exchange reaction between homologous single-stranded and double-stranded DNA substrates. Pairing of the 3'-overhangs located at the damaged DNA with a homologous double-stranded DNA enables the re-synthesis of the damaged region using the homologous DNA as the template. In recent studies, conformational changes in the DNA-interacting regions of Methanococcus voltae RadA have been correlated with the presence of activity-stimulating potassium or calcium ions in the ATPase centre. The series of crystal structures of M. maripaludis RadA presented here further suggest the conservation of an allosteric switch in the ATPase centre which controls the conformational status of DNA-interacting loops. Structural comparison with the distant Escherichia coli RecA homologue supports the notion that the conserved Lys248 and Lys250 residues in RecA play a role similar to that of cations in RadA. The conservation of a cationic bridge between the DNA-interacting L2 region and the terminal phosphate of ATP, together with the apparent stability of the nucleoprotein filament, suggests a gap-displacement model which may explain the advantage of ATP hydrolysis for DNA-strand exchange. Conservation of a conformational switch in RadA recombinase from Methanococcus maripaludis.,Li Y, He Y, Luo Y Acta Crystallogr D Biol Crystallogr. 2009 Jun;65(Pt 6):602-10. Epub 2009, May 15. PMID:19465774 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Resolvase 3D structures

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