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5'-p-Fluorosulfonylbenzoyl adenosine (FSBA), an ATP-like affinity labelling reagent, reacted with rabbit skeletal muscle myosin light chain kinase (skMLCK) and its calmodulin complex in a site-specific manner. Reaction was dependent upon the presence of the adenosine moiety of FSBA, saturated with increasing FSBA, was inhibited by MgATP, and was accompanied by stoichiometric incorporation of [ ...
Myosin light chain kinase contains a regulatory segment consisting of an autoinhibitory region and a calmodulin-binding sequence that folds back on its catalytic core to inhibit kinase activity. It has been proposed that α-helix formation may be involved in displacement of the regulatory segment and activation of the kinase by Ca 2+ /calmodulin. Proline mutations were introduced at putative...
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