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Vascular smooth muscle caldesmon.

T Clark, P K Ngai, C Sutherland

    The Journal of Biological Chemistry
    |June 15, 1986
    PubMed
    Summary
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    Caldesmon, a key actin and calmodulin-binding protein, is found across various bovine tissues. While sharing functional similarities with chicken caldesmon, bovine aorta caldesmon exhibits distinct physicochemical properties.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Cellular Biology

    Background:

    • Caldesmon is a major protein that binds to actin and calmodulin.
    • Its presence has been noted in various tissues, including smooth and striated muscles, and nonmuscle tissues.

    Purpose of the Study:

    • To identify caldesmon in diverse bovine tissues.
    • To purify and characterize caldesmon from bovine aorta smooth muscle.
    • To compare the properties of bovine aorta caldesmon with chicken gizzard caldesmon.

    Main Methods:

    • Denaturing polyacrylamide gel electrophoresis and immunoblotting were used to detect caldesmon in tissue homogenates.
    • Purification involved heat treatment, ion-exchange chromatography, and calmodulin affinity chromatography.
    • Characterization included assessing interactions with actin and calmodulin, effects on myosin ATPase activity, and physicochemical property analysis (Mr, extinction coefficient, amino acid composition, peptide mapping).

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    Main Results:

    • Caldesmon was identified in various bovine tissues.
    • Bovine aorta caldesmon demonstrated Ca2+-dependent calmodulin binding, Ca2+-independent F-actin binding, and inhibition of actin-activated myosin Mg2+-ATPase activity.
    • Physicochemical analyses revealed differences in molecular weight, extinction coefficient, amino acid composition, and peptide maps between bovine aorta and chicken gizzard caldesmon.

    Conclusions:

    • Caldesmon exhibits widespread tissue and species distribution.
    • Bovine aorta caldesmon shares functional similarities with chicken gizzard caldesmon, particularly in actin and calmodulin interactions and myosin ATPase inhibition.
    • Despite functional similarities, bovine aorta caldesmon possesses distinct physicochemical characteristics compared to chicken gizzard caldesmon.