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Various concentrations of actin (0.3 or 1 mᴍ MgCl 2 , 1 mᴍ ATP , 1 mᴍ EGTA) reached their final degree of polymerization (measured by a pyrene dye attached to actin) earlier in the presence of cytochalasin B than in its absence. The curves relating concentrations of polymeric F-actin to total actin concentration were under these conditions highly nonlinear making an unam biguous extrapolation to zero F-actin concentration (to deduce the “critical concentration” of actin poly­ merization) im possible. The concentration of actin, above which polymerization occurred, was unaltered by cytochalasin B (although for reasons not yet understood the specific fluorescence intensity of polymerized actin was lower in the presence of cytochalasin B than in its absence). The results show that a distinct “critical concentration” of actin polymerization must not always be well defined.

Polymerization of Actin in the Absence and Presence of Cytochalasin B: Problems of Determining "Critical Concentration"