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Published 17 March 2003. doi:10.1083/jcb.200210139
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© The Rockefeller University Press, 0021-9525/2003/3/887 $5.00
The Journal of Cell Biology, Volume 160, Number 6, 887-897

Article

Identification of an organelle-specific myosin V receptor



Kuniko Ishikawa, Natalie L. Catlett, Jennifer L. Novak, Fusheng Tang, Johnathan J. Nau and Lois S. Weisman

Department of Biochemistry, The University of Iowa, Iowa City, IA 52242

Address correspondence to Lois S. Weisman, Dept. of Biochemistry, The University of Iowa, Iowa City, IA 52242. Tel.: (319) 335-8581. Fax: (319) 335-9570. E-mail: lois-weisman{at}uiowa.edu

Class V myosins are widely distributed among diverse organisms and move cargo along actin filaments. Some myosin Vs move multiple types of cargo, where the timing of movement and the destinations of selected cargoes are unique. Here, we report the discovery of an organelle-specific myosin V receptor. Vac17p, a novel protein, is a component of the vacuole-specific receptor for Myo2p, a Saccharomyces cerevisiae myosin V. Vac17p interacts with the Myo2p cargo-binding domain, but not with vacuole inheritance-defective myo2 mutants that have single amino acid changes within this region. Moreover, a region of the Myo2p tail required specifically for secretory vesicle transport is neither required for vacuole inheritance nor for Vac17p–Myo2p interactions. Vac17p is localized on the vacuole membrane, and vacuole-associated Myo2p increases in proportion with an increase in Vac17p. Furthermore, Vac17p is not required for movement of other cargo moved by Myo2p. These findings demonstrate that Vac17p is a component of a vacuole-specific receptor for Myo2p. Organelle-specific receptors such as Vac17p provide a mechanism whereby a single type of myosin V can move diverse cargoes to distinct destinations at different times.

Key Words: membrane transport; Myo2p; Vac17p; yeast; vacuole

N.L. Catlett and K. Ishikawa contributed equally to this paper.

N.L. Catlett's present address is Torrey Mesa Research Institute, Syngenta Research and Technology, 3115 Merryfield Row #100, San Diego, CA 92121.


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