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- W2314573407 abstract "A peptide inhibitor, myosin kinase inhibitor (MKI), of myosin light chain kinase (MLCK) was tested for its effects on contractility and myosin light chain phosphorylation in Triton X-100 skinned guinea pig taenia coli. MKI is based on the amino acid sequence of the myosin light chain (residues 11-19 LC20) and is a competitive inhibitor [inhibitory constant (Ki) congruent to 10 microM] of purified MLCK with respect to myosin light chain (LC20). MKI inhibited unloaded shortening velocity (V(us)) and the calcium-sensitive ATPase activity of the skinned fibers but had no significant effect on steady-state isometric force or myosin light chain phosphorylation, as measured by IEF-polyacrylamide gel electrophoresis analysis. MKI had no significant effect on V(us) of thiophosphorylated fibers in the absence of calcium. MKI inhibited MLCK activity in protein extracts from taenia coli, as measured by radioactive phosphate incorporation into LC20. Surprisingly, MKI also inhibited the phosphatase activity of these same extracts. This peptide slowed the rate and extent of relaxation of calcium-contracted fibers and elicited a contraction in relaxed fibers. These results are consistent with the hypothesis that MKI may be a phosphatase inhibitor as well as an inhibitor of MLCK. Our data further suggest that the rate of phosphorylation-dephosphorylation turnover may be important in regulating V(us) in smooth muscle." @default.
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- W2314573407 date "1992-06-01" @default.
- W2314573407 modified "2023-09-24" @default.
- W2314573407 title "Effects of myosin kinase inhibiting peptide on contractility and LC20 phosphorylation in skinned smooth muscle" @default.
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- W2314573407 doi "https://doi.org/10.1152/ajpcell.1992.262.6.c1437" @default.
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