PMID: 31672988
Biancospino M, Buel GR, Nino CA, Maspero E, Scotto di Perrotolo R, Raimondi A, Redlingshofer L, Weber J, Brodsky FM, Walters KJ, Polo S
Clathrin light chain A drives selective myosin VI recruitment to clathrin-coated pits under membrane tension.
Nat Commun. 2019 Oct 31;10(1):4974. doi: 10.1038/s41467-019-12855-6.
Clathrin light chains (CLCa and CLCb) are major constituents of clathrin-coated vesicles. Unique functions for these evolutionary conserved paralogs remain elusive, and their role in clathrin-mediated endocytosis in mammalian cells is debated. Here, we find and structurally characterize a direct and selective interaction between CLCa and the long isoform of the actin motor protein myosin VI, which is expressed exclusively in highly polarized tissues. Using genetically-reconstituted Caco-2 cysts as proxy for polarized epithelia, we provide evidence for coordinated action of myosin VI and CLCa at the apical surface where these proteins are essential for fission of clathrin-coated pits. We further find that myosin VI and Huntingtin-interacting protein 1-related protein (Hip1R) are mutually exclusive interactors with CLCa, and suggest a model for the sequential function of myosin VI and Hip1R in actin-mediated clathrin-coated vesicle budding.