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1995/09/01
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A Calponin Peptide Enhances Ca2+ Sensivity of Smooth Muscle Contraction without Affecting Myosin Light Chain Phosphorylation

Itoh T, Suzuki A, Watanabe Y, Mino T, Naka M, Tanaka T.
J Biol Chem. 1995 Sep 1;270(35):20400-3.

Abstract

In permeabilized smooth muscle, exogenously applied calponin binds to myofibrils and reduces Ca(2+)-activated tension (Itoh, T., Suzuki, S., Suzuki, A., Nakamura, F., Naka, M., and Tanaka, T. (1994) Pflügers Arch. Eur. J. Physiol. 427, 301-308). A calponin peptide (calponin Phe173-Arg185), which inhibits the binding of calponin to actin, blocks the action of calponin and enhances the contraction induced by submaximal Ca2+ in permeabilized vascular smooth muscle. Unlike calmodulin, this peptide enhances the Ca(2+)-induced contraction without a corresponding increase in the level of myosin light chain phosphorylation. These results suggest that calponin decreases the sensitivity of smooth muscle to Ca2+ at a given level of myosin light chain phosphorylation.

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