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hRAD51 lacks cooperative DNA-dependent ATPase activity and appears to function with 5–10-fold less Mg 2+ compared to RecA. We have further explored the effect of Mg 2+ on adenosine nucleotide binding, ATPase, and DNA strand exchange activities. hRAD51 was saturated with the poorly hydrolyzable analog of ATP, ATPγS, at approximately 0.08mM Mg 2+ . In contrast, >0.5mM Mg ...