PMID: 3754463Mar 25, 1986Paper

Calmodulin binding domains: characterization of a phosphorylation and calmodulin binding site from myosin light chain kinase

Biochemistry
T J LukasD M Watterson

Abstract

A protein kinase phosphorylation site in chicken gizzard myosin light chain kinase (MLCK) has been identified, and a synthetic peptide analogue of this site has been shown to be a high-affinity calmodulin binding peptide as well as a substrate for cyclic AMP dependent protein kinase. Phosphorylation of the site in MLCK is diminished when reactions are done in the presence of calmodulin. A fragment of MLCK containing the phosphorylation site was shown to have the amino acid sequence Ala-Arg-Arg-Lys-Trp-Gln-Lys-Thr-Gly-His-Ala-Val-Arg-Ala-Ile-Gly-Arg-Leu- Ser-Ser. The interaction of calmodulin with a synthetic peptide based on this sequence was characterized by using circular dichroism and fluorescence spectroscopies and inhibition of calmodulin activation of MLCK. The peptide-calmodulin complex had an estimated dissociation constant in the range of 1 nM, underwent spectroscopic changes in the presence of calmodulin consistent with the induction of an alpha-helical structure, and interacted with calmodulin with an apparent 1:1 stoichiometry. Studies with other synthetic peptide analogues indicated that the phosphorylation of the serine residues diminished the ability of the peptide to interact with calmodulin even though the seri...Continue Reading

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