HRDC suppresses the duplex unwinding activity of RecQ.
A, fractions of remaining 16 bp 12 nt-1 molecules on coverslip versus time after addition of 5 nm RecQ and 20 µm ATP. Lines are the simple connections of the individual data points by Origin 8.0. B, the initiation time of 16 bp 12 nt-1 in 5 nm RecQ, RecQ523, and RecQY555A in different concentrations of ATP. C, the fractions of 16 bp 12 nt-2 traces showing one-step unwinding in 5 nm RecQ, RecQ523, and RecQY555A in different concentrations of ATP.