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. 1985 Nov 1;231(3):517–522. doi: 10.1042/bj2310517

Caldesmon is a Ca2+-regulatory component of native smooth-muscle thin filaments.

S B Marston, W Lehman
PMCID: PMC1152781  PMID: 2934055

Abstract

Thin-filament preparations from four smooth muscle types (gizzard, stomach, trachea, aorta) all activate myosin MgATPase activity, are regulated by Ca2+, and contain actin, tropomyosin and a 120000-140000-Mr protein in the molar proportions 1:1/7:1/26. The 120000-140000-Mr protein from all sources is a potent inhibitor of actomyosin ATPase activity. Peptide-mapping and immunological evidence is presented showing that it is identical with caldesmon. Quantitative immunological data suggest that caldesmon is a component of all the thin filaments and that the thin-filament-bound caldesmon accounts for all the caldesmon in intact tissue. The myosin light-chain kinase content of thin-filament preparations was found to be negligible. We propose that caldesmon-based thin-filament Ca2+ regulation is a physiological mechanism in all smooth muscles.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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