The M13 ssDNA-dependent ATP hydrolysis of RecA-RFP protein is not inhibited by SSB protein at pH 6.2. A, M13 ssDNA-dependent ATPase activity in the presence or absence of SSB protein (1 μm). Open triangles, wild-type RecA without SSB; open circles, wild-type RecA with SSB protein; closed triangles, RecA-RFP without SSB protein; closed circles, RecA-RFP with SSB protein. B, M13 ssDNA-dependent dATPase activity in the presence or absence of SSB protein (1 μm). C, M13 ssDNA-dependent ATPase activity in the presence or absence of SSB protein (0.45 μm). D, M13 ssDNA-dependent dATPase activity in the presence or absence of SSB protein (0.45 μm). Symbols in panels B–D are the same as in panel A. Data are mean ± S.D.