Actin-binding proteins can modify the properties of actin. You purify an actin-binding protein called Abp. You examine the effect of Abp on actin polymerization by measuring the kinetics of in vitro actin filament formation, in which pure actin is added in the presence and the absence of purified Abp protein. You obtain the results shown in the figure below.
Further experiments show that Abp binds to the side of actin filaments and preferentially binds to ADP-containing actin filaments. Propose a possible molecular mechanism consistent with the data above. Please see attachment 
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