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A cAMP-dependent regulatory protein for RLC-a myosin kinase catalyzing the phosphorylation of scallop smooth muscle myosin light chain.

A cAMP-dependent regulatory protein for RLC-a myosin kinase catalyzing the phosphorylation of scallop smooth muscle myosin light chain. Research Abstract Details 

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  • A cAMP-dependent regulatory protein for RLC-a myosin kinase catalyzing the phosphorylation of scallop smooth muscle myosin light chain. Abstract Text:

    h sohmaH Sohma,k inoueK Inoue,f moritaF Morita,

    A cAMP-dependent regulatory protein which modulates the phosphorylation of scallop myosin regulatory light chain-a (RLC-a) by RLC-a myosin kinase (aMK) (Sohma, H. & Morita, F. (1986) J. Biochem. 100, 1155-1163) was purified from the scallop smooth muscle. RLC-a is abundant in the opaque portion of scallop smooth muscle, one of the catch muscles. The regulatory protein for aMK was purified by employing successively DEAE Toyopearl ion exchange chromatography, Sepharose 4B-8(6-aminohexylamino)cAMP affinity chromatography, and Sephadex G 100 gel filtration. The molecular mass of the regulatory protein was 41 kDa, based on the mobility in polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate. With increasing amounts of the regulatory protein, the aMK activity decreased, and complete inhibition was observed at the concentration of twice that of aMK. The aMK activity inhibited by the regulatory protein was restored by the addition of cAMP. These results suggest that aMK is similar to a catalytic subunit of cAMP-dependent protein kinase, and the protein reported here is similar to its regulatory subunit. aMK may exist as an inactive form, as a combination with this regulatory protein, in vivo and be deinhibited by an increase in the intracellular concentration of cAMP. We discuss a possible correlation between the phosphorylation of RLC-a in myosin catalyzed by aMK and the catch state of the opaque portion of scallop smooth muscle.

    A cAMP-dependent regulatory protein for RLC-a myosin kinase catalyzing the phosphorylation of scallop smooth muscle myosin light chain. Publishing Authors By Initials

    h sohmaH Sohma,k inoueK Inoue,f moritaF Morita,

    For similar proteins research abstracts see: proteins research

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    A cAMP-dependent regulatory protein for RLC-a myosin kinase catalyzing the phosphorylation of scallop smooth muscle myosin light chain. Journal Published:

    PUBLICATION TYPE: Journal Article

    Journal: Journal of biochemistry

    VOLUME: 103

    Page Numbers: 431-5

    Journal Abbreviation: J. Biochem.

    ISSN: 0021-924X

    DAY: 19

    MONTH: Mar

    YEAR: 1988

    A cAMP-dependent regulatory protein for RLC-a myosin kinase catalyzing the phosphorylation of scallop smooth muscle myosin light chain. Information

    Number of References:

    LANGUAGE: eng

    NlmUniqueID: 376600

    A cAMP-dependent regulatory protein for RLC-a myosin kinase catalyzing the phosphorylation of scallop smooth muscle myosin light chain. Keywords Mesh Terms:

    KEYWORDS: Proteins

    MESH TERMS: physiology

    Chemical & Substance for Abstract: A cAMP-dependent regulatory protein for RLC-a myosin kinase catalyzing the phosphorylation of scallop smooth muscle myosin light chain. Information

    Substance Name: Myosins

    Registry Number: EC 3.6.1.4

    Grant and Affiliation Information for A cAMP-dependent regulatory protein for RLC-a myosin kinase catalyzing the phosphorylation of scallop smooth muscle myosin light chain.

    AFFILIATION: Department of Chemistry, Faculty of Sciences, Hokkaido University.

    Country: JAPAN

    JAPAN Research PublicationJAPAN Research Publication

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    MEDLINETA: J Biochem

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