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PMID: 9335586 Published · ppublish English Journal Article Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S.

Genetic interactions between a pep7 mutation and the PEP12 and VPS45 genes: evidence for a novel SNARE component in transport between the Saccharomyces cerevisiae Golgi complex and endosome.

Genetics ·Vol. 147 ·No. 2 ·1997-10-00 ·Pages 467-78

Webb GC, Hoedt M, Poole LJ, Jones EW

Abstract

The PEP7 gene from Saccharomyces cerevisiae encodes a 59-kD hydrophilic polypeptide that is required for transport of soluble vacuolar hydrolase precursors from the TGN to the endosome. This study presents the results of a high-copy suppression analysis of pep7-20 mutant phenotypes. This analysis demonstrated that both VPS45 and PEP12 are allele-specific high-copy suppressors of pep7-20 mutant phenotypes. Overexpression of VPS45 was able to completely suppress the Zn2+ sensitivity and partially suppress the carboxypeptidase Y deficiency. Overexpression of PEP12 was able to do the same, but to a lesser extent. Vps45p and Pep12p are Sec1p and syntaxin (t-SNARE) homologues, respectively, and are also thought to function in transport between the TGN and endosome. Two additional vacuole pathway SNARE complex homologues, Vps33p (Sec1p) and Pth1p (syntaxin), when overexpressed, were unable to suppress pep7-20 or any other pep7 allele, further supporting the specificity of the interactions of pep7-20 with PEP12 and VPS45. Because several other vesicle docking/fusion reactions take place in the cell without discernible participation of Pep7p homologues, we suggest that Pep7p is a step-specific regulator of docking and/or fusion of TGN-derived transport vesicles onto the endosome.

MeSH Terms
Adaptor Proteins, Signal Transducing Biological Transport Carrier Proteins/genetics,metabolism Cytoskeletal Proteins Endosomes/metabolism Fungal Proteins/genetics,metabolism Genes, Suppressor Golgi Apparatus/metabolism Membrane Proteins/genetics,metabolism Mutation Phenotype Qa-SNARE Proteins Saccharomyces cerevisiae/genetics,metabolism Saccharomyces cerevisiae Proteins Vesicular Transport Proteins
Chemicals
Adaptor Proteins, Signal Transducing Carrier Proteins Cytoskeletal Proteins Fungal Proteins Membrane Proteins PEP12 protein, S cerevisiae PEP7 protein, S cerevisiae Qa-SNARE Proteins Saccharomyces cerevisiae Proteins VPS45 protein, S cerevisiae Vesicular Transport Proteins
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Webb G C
Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
Hoedt M
Poole L J
Jones E W
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Article Info
Journal
Genetics
Abbr.
Genetics
ISSN
0016-6731
DOI
10.1093/genetics/147.2.467
Published
1997-10-00
Pages
467-78
Language
English
Region
United States
NLM ID
0374636
PMCID
PMC1208171
Subset
IM
Grants
NIGMS NIH HHS · GM-29713 · United States
External Links
PubMed source DOI: 10.1093/genetics/147.2.467 PMC Full Text View journal details
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