Myosin Mg-ATPase of molluscan muscles is slightly activated by F-actin under catch state in vitro
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Molluscan muscle twitchin, a titin/connectin-related giant protein, regulates interactions between actin and myosin filaments at low Ca(2+) concentrations. When it is dephosphorylated, actin filaments tightly bind to myosin filaments, resulting in the catch st... ...
