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- W2063150400 abstract "In the course of determining the primary structure of rabbit skeletal muscle myosin light chain kinase (MLCK; ATP:protein phosphotransferase, EC 2.7.1.37) a peptide fragment was obtained that appears to represent the calmodulin-binding domain of this enzyme. Low concentrations of the peptide inhibited calmodulin activation of MLCK (Ki congruent to 1 nM). The peptide was not associated with a catalytically active, calmodulin-independent form of MLCK that was obtained by limited proteolysis. The peptide is 27 residues in length and represents the carboxyl terminus of MLCK. The sequence of the peptide shows no significant homology with any known protein sequence. The peptide contains one tryptophanyl residue and a high percentage of basic and hydrophobic residues, but no acidic or prolyl residues. Much of the sequence has a high probability of forming alpha helix. A chemically synthesized peptide has been prepared to study the interactions of the peptide and calmodulin in more detail. The intrinsic tryptophan fluorescence of the synthetic peptide shows a significant enhancement (approximately equal to 45%) in the presence of Ca2+ and calmodulin; fluorescence enhancement is maximal at a peptide:calmodulin stoichiometry of 1:1. Calmodulin-Sepharose affinity chromatography in the presence of 2 M urea indicates that the interaction of peptide and calmodulin is Ca2+-dependent. The results of these studies indicate that the catalytic and calmodulin-binding domains of MLCK represent distinct and separable regions of the protein. In addition, the results provide a basis for future studies of the molecular and evolutionary details of calmodulin-dependent enzyme regulation." @default.
- W2063150400 created "2016-06-24" @default.
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- W2063150400 date "1985-05-01" @default.
- W2063150400 modified "2023-09-26" @default.
- W2063150400 title "Identification of the calmodulin-binding domain of skeletal muscle myosin light chain kinase." @default.
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- W2063150400 doi "https://doi.org/10.1073/pnas.82.10.3187" @default.
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