Sec35p, a novel peripheral membrane protein, is required for ER to Golgi vesicle docking.

SEC35 was identified in a novel screen for temperature-sensitive mutants in the secretory pathway of the yeast Saccharomyces cerevisiae (. Genetics. 142:393-406). At the restrictive temperature, the sec35-1 strain exhibits a transport block between the ER and the Golgi apparatus and accumulates numerous vesicles. SEC35 encodes a novel cytosolic protein ...
of 32 kD, peripherally associated with membranes. The temperature-sensitive phenotype of sec35-1 is efficiently suppressed by YPT1, which encodes the rab-like GTPase required early in the secretory pathway, or by SLY1-20, which encodes a dominant form of the ER to Golgi target -SNARE-associated protein Sly1p. Weaker suppression is evident upon overexpression of genes encoding the vesicle-SNAREs SEC22, BET1, or YKT6. The cold-sensitive lethality that results from deleting SEC35 is suppressed by YPT1 or SLY1-20. These genetic relationships suggest that Sec35p acts upstream of, or in conjunction with, Ypt1p and Sly1p as was previously found for Uso1p. Using a cell-free assay that measures distinct steps in vesicle transport from the ER to the Golgi, we find Sec35p is required for a vesicle docking stage catalyzed by Uso1p. These genetic and biochemical results suggest Sec35p acts with Uso1p to dock ER-derived vesicles to the Golgi complex.
Mesh Terms:
Amino Acid Sequence, Base Sequence, Biological Transport, Carrier Proteins, Cloning, Molecular, Coated Vesicles, DNA, Fungal, Endoplasmic Reticulum, Fungal Proteins, GTP Phosphohydrolases, GTP-Binding Proteins, Gene Deletion, Golgi Apparatus, Membrane Proteins, Molecular Sequence Data, Munc18 Proteins, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Vesicular Transport Proteins, rab GTP-Binding Proteins
J. Cell Biol.
Date: Jun. 01, 1998
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