A role for myosin-I in actin assembly through interactions with Vrp1p, Bee1p, and the Arp2/3 complex |
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Authors: | Evangelista M Klebl B M Tong A H Webb B A Leeuw T Leberer E Whiteway M Thomas D Y Boone C |
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Affiliation: | Department of Biology, Queen's University, Kingston, Ontario, K7L 3N6, Canada. |
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Abstract: | Type I myosins are highly conserved actin-based molecular motors that localize to the actin-rich cortex and participate in motility functions such as endocytosis, polarized morphogenesis, and cell migration. The COOH-terminal tail of yeast myosin-I proteins, Myo3p and Myo5p, contains an Src homology domain 3 (SH3) followed by an acidic domain. The myosin-I SH3 domain interacted with both Bee1p and Vrp1p, yeast homologues of human WASP and WIP, adapter proteins that link actin assembly and signaling molecules. The myosin-I acidic domain interacted with Arp2/3 complex subunits, Arc40p and Arc19p, and showed both sequence similarity and genetic redundancy with the COOH-terminal acidic domain of Bee1p (Las17p), which controls Arp2/3-mediated actin nucleation. These findings suggest that myosin-I proteins may participate in a diverse set of motility functions through a role in actin assembly. |
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Keywords: | yeast myosin-I Arp2/3 actin assembly WASP |
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