O-glycosylation as a sorting determinant for cell surface delivery in yeast.

Journal Article

Little is known about the mechanisms that determine localization of proteins to the plasma membrane in Saccharomyces cerevisiae. The length of the transmembrane domains and association of proteins with lipid rafts have been proposed to play a role in sorting to the cell surface. Here, we report that Fus1p, an O-glycosylated integral membrane protein involved in cell fusion during yeast mating, requires O-glycosylation for cell surface delivery. In cells lacking PMT4, encoding a mannosyltransferase involved in the initial step of O-glycosylation, Fus1p was not glycosylated and accumulated in late Golgi structures. A chimeric protein lacking O-glycosylation motif was missorted to the vacuole and accumulated in late Golgi in wild-type cells. Exocytosis of this protein could be restored by addition of a 33-amino acid portion of an O-glycosylated sequence from Fus1p. Our data suggest that O-glycosylation functions as a sorting determinant for cell surface delivery of Fus1p.

Full Text

Duke Authors

Cited Authors

  • Proszynski, TJ; Simons, K; Bagnat, M

Published Date

  • April 2004

Published In

Volume / Issue

  • 15 / 4

Start / End Page

  • 1533 - 1543

PubMed ID

  • 14742720

International Standard Serial Number (ISSN)

  • 1059-1524

Digital Object Identifier (DOI)

  • 10.1091/mbc.E03-07-0511

Language

  • eng

Conference Location

  • United States