Actin and Myosin

ID #1957

When at the plus end of an actin filament the concentration of available G actin is above the critical concentration of the plus end, while the concentration of available G actin at the minus end is right at the critical concentration of the minus end, why would the filament be polymerizing at the + end and remaining the same at the - end?


If the Cc was equal at both ends, then what you described would be correct. But the Cc is different at each end of an actin filament, which means you have to apply the prediction of behavior to each end individually. And if an end is at the Cc, it will have no net growth at that end.

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