Affiliation:
1. Max Plank Institute for Molecular Cell Biology and Genetics, 01307 Dresden, Germany; and
2. Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, New York 10461
Abstract
Correct sorting of proteins is essential to generate and maintain the identity and function of the different cellular compartments. In this study we demonstrate the role of lipid rafts in biosynthetic delivery of Pma1p, the major plasma membrane proton ATPase, to the cell surface. Disruption of rafts led to mistargeting of Pma1p to the vacuole. Conversely, Pma1-7, an ATPase mutant that is mistargeted to the vacuole, was shown to exhibit impaired raft association. One of the previously identified suppressors, multicopy AST1, not only restored surface delivery but also raft association of Pma1-7. Ast1p, which is a peripheral membrane protein, was found to directly interact with Pma1p inducing its clustering into a SDS/Triton X100-resistant oligomer. We suggest that clustering facilitates partition of Pma1p into rafts and transport to the cell surface.
Publisher
American Society for Cell Biology (ASCB)
Subject
Cell Biology,Molecular Biology
Cited by
201 articles.
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