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PMID:1601878

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Citation

Griff, IC, Schekman, R, Rothman, JE and Kaiser, CA (1992) The yeast SEC17 gene product is functionally equivalent to mammalian alpha-SNAP protein. J. Biol. Chem. 267:12106-15

Abstract

The SEC17 gene of Saccharomyces cerevisiae is required for vesicular transport between the endoplasmic reticulum and the Golgi apparatus. Here we report that the product of the SEC17 gene has the exact biochemical properties expected for a yeast homologue of the mammalian transport factor, alpha-SNAP. The DNA sequence of SEC17 codes for a protein of predicted molecular mass of 33 kDa. Immunoblotting indicates that Sec17p fractionates as a peripheral membrane protein and is mostly soluble when overexpressed, suggesting the presence of a saturable membrane receptor for Sec17p. Sec17p was purified from yeast cytosol using a SNAP-dependent in vitro mammalian Golgi transport assay. Kinetic analysis using this assay shows Sec17p acts temporally close to the fusion of transport vesicles with the medial Golgi compartment. In yeast extracts, Sec17p binds to Sec18p with a 1:1 stoichiometry. The interaction between Sec17p and Sec18p requires an activity provided by yeast membranes, and this putative membrane receptor activity is not extracted by high salt treatment of membranes.

Links

PubMed

Keywords

Amino Acid Sequence; Animals; Base Sequence; Blotting, Western; Carrier Proteins/genetics; Carrier Proteins/physiology; Chromatography, Liquid; Cloning, Molecular; DNA, Fungal; Electrophoresis, Polyacrylamide Gel; Endoplasmic Reticulum/metabolism; Fungal Proteins/genetics; Genes, Fungal; Golgi Apparatus/metabolism; Guanosine 5'-O-(3-Thiotriphosphate)/metabolism; Kinetics; Mammals; Membrane Proteins/genetics; Membrane Proteins/physiology; Molecular Sequence Data; N-Ethylmaleimide-Sensitive Proteins; Restriction Mapping; Saccharomyces cerevisiae/genetics; Saccharomyces cerevisiae Proteins; Soluble N-Ethylmaleimide-Sensitive Factor Attachment Proteins; Vesicular Transport Proteins

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

YEAST:SEC17

located_in

GO:0019898: extrinsic component of membrane

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

YEAST:SEC17

involved_in

GO:0048280: vesicle fusion with Golgi apparatus

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

See also

References

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