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Potassium ions stabilize the DnaK.ADP complex that forms on incubation of nucleotide-free DnaK with ADP or ATP. Generation of the crystallographically defined Mg2+ cluster [Wilbanks, S.M. & McKay, D.B. (1995) J. Biol. Chem. 270, 2251-2257], in which two K+ and the nucleotide are bound together with Mg2+ in the ATPase site, appears to be essential for the(More)
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