Elsevier

The Enzymes

Volume 17, 1986, Pages 113-166
The Enzymes

4 Calmodulin-Dependent Protein Kinases

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Publisher Summary

This chapter discusses the broad specificity of calmodulin-dependent protein kinases in relation to protein substrates. Myosin light chain kinases are asymmetric, monomeric enzymes that vary considerably in mass depending upon tissue source and animal species. They have a calmodulin-binding domain that is distinct from the catalytic domain. In addition, the smooth-muscle myosin light chain kinases contain two sites that are phosphorylated by cyclic AMP-dependent protein kinase. These sites, one of which effects calmodulin activation of the enzyme, are not in the catalytic or calmodulin-binding domains. Limited information is available on the catalytic mechanism of myosin light chain kinases or characterization of specific chemical and physical interactions between enzyme and substrates. Analyses of the catalytic properties indicate a sequential kinetic mechanism for skeletal-muscle myosin light chain kinase. Evidence has been presented in kinetic studies with rabbit skeletal-muscle myosin light chain kinase for a rapid equilibrium bi-bi kinetic mechanism. In addition, it appears that the kinase can form a dead-end complex with ADP and unphosphorylated myosin light chain.

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