The M13 ssDNA-dependent ATPase activity of RecA-RFP protein is inhibited by SSB protein at pH 7.5. A, M13 ssDNA-dependent ATPase activity in the presence or absence of SSB protein (1 μm). Open triangles, wild-type RecA protein without SSB; open circles, wild-type RecA protein with SSB protein; closed triangles, RecA-RFP without SSB; closed circles, RecA-RFP with SSB protein. B, M13 ssDNA-dependent dATPase activity in the presence or absence of SSB protein (1 μm). Symbols are the same as in panel A. Data are mean ± S.D.