Analysis of filamin and α‐actinin binding to actin by the stopped flow method

Abstract
We ascertained by the stopped flow method the overall association rate constant, k +1, of filamin and α-actinin to fluorescently labelled filamentous actin of ~ 1.3 × 106M−1 · s−1 and ~ 1.0 × 106M−1 · s−1 as well as the overall dissociation rate constant,k −1 of ~ 0.6s−1 and ~ 0.4s−1, respectively. The overall equilibrium constant, K, for filamin and α-actinin to actin deduced from the relation K = agree well with published data.