Two conserved lysines at the 50/20-kDa junction of myosin are necessary for triggering actin activation.

Abstract excerpt

Actin stimulates myosin's activity by inducing structural alterations that correlate with the transition from a weakly to a strongly bound state, during which time inorganic phosphate (P(i)) is released from myosin's active site. The surface loop at the 50/20-kDa junction of myosin (loop 2) is part of the actin interface. Here we demonstrate that elimination of two highly conserved lysines at the C-terminal end...

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