PMID: 9190202Feb 1, 1997Paper

Sec31 encodes an essential component of the COPII coat required for transport vesicle budding from the endoplasmic reticulum

Molecular Biology of the Cell
N R SalamaRandy Schekman

Abstract

The COPII vesicle coat protein promotes the formation of endoplasmic reticulum- (ER) derived transport vesicles that carry secretory proteins to the Golgi complex in Saccharomyces cerevisiae. This coat protein consists of Sar1p, the Sec23p protein complex containing Sec23p and Sec24p, and the Sec13p protein complex containing Sec13p and a novel 150-kDa protein, p150. Here, we report the cloning and characterization of the p150 gene. p150 is encoded by an essential gene. Depletion of this protein in vivo blocks the exit of secretory proteins from the ER and causes an elaboration of ER membranes, indicating that p150 is encoded by a SEC gene. Additionally, overproduction of the p150 gene product compromises the growth of two ER to Golgi sec mutants: sec16-2 and sec23-1. p150 is encoded by SEC31, a gene isolated in a genetic screen for mutations that accumulate unprocessed forms of the secretory protein alpha-factor. The sec31-1 mutation was mapped by gap repair, and sequence analysis revealed an alanine to valine change at position 1239, near the carboxyl terminus. Sec31p is a phosphoprotein and treatment of the Sec31p-containing fraction with alkaline phosphatase results in a 50-75% inhibition of transport vesicle formation acti...Continue Reading

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