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

211 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
Externally publishedYes

ASJC Scopus subject areas

  • General


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