Role of the myosin assembly protein UNC-45 as a molecular chaperone for myosin

José M. Barral, Alex H. Hutagalung, Achim Brinker, F. Ulrich Hartl, Henry F. Epstein

    Research output: Contribution to journalArticlepeer-review

    205 Scopus citations


    The organization of myosin into motile cellular structures requires precise temporal and spatial regulation. Proteins containing a UCS (UNC-45/CRO1/She4p) domain are necessary for the incorporation of myosin into the contractile ring during cytokinesis and into thick filaments during muscle development. We report that the carboxyl-terminal regions of UNC-45 bound and exerted chaperone activity on the myosin head. The amino-terminal tetratricopeptide repeat domain of UNC-45 bound the molecular chaperone Hsp90. Thus, UNC-45 functions both as a molecular chaperone and as an Hsp90 co-chaperone for myosin, which can explain previous findings of altered assembly and decreased accumulation of myosin in UNC-45 mutants of Caenorhabditis elegans.

    Original languageEnglish (US)
    Pages (from-to)669-671
    Number of pages3
    Issue number5555
    StatePublished - Jan 25 2002

    ASJC Scopus subject areas

    • General


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