Saccharomyces cerevisiae pep7 mutants are defective in transport of soluble vacuolar hydrolases to the lysosome-like vacuole. PEP7 is a nonessential gene that encodes a hydrophilic protein of 515 amino acids. A cysteine-rich tripartite motif in the N-terminal half of the polypeptide shows striking similarity to sequences found in many other eukaryotic proteins. Several of these proteins are thought to function in the vacuolar/lysosomal pathway. Mutations that change highly conserved cysteine residues in this motif lead to a loss of Pep7p function. Kinetic studies demonstrate that Pep7p function is required for the transport of the Golgi-precursors of the soluble hydrolases carboxypeptidase Y, proteinase A, and proteinase B to the endosome. Integral membrane hydrolase alkaline phosphatase is transported to the vacuole by a parallel intracellular pathway that does not require Pep7p function. pep7 mutants accumulate a 40-60-nm vesicle population, suggesting that Pep7p functions in a vesicle consumption step in vesicle-mediated transport of soluble hydrolases to the endosome. Whereas pep7 mutants demonstrate no defects in endocytic uptake at the plasma membrane, the mutants demonstrate defects in transport of receptor-mediated macromolecules through the endocytic pathway. Localization studies indicate that Pep7p is found both as a soluble cytoplasmic protein and associated with particulate fractions. We conclude that Pep7p functions as a novel regulator of vesicle docking and/or fusion at the endosome.
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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Site | Modification | Modifier | Source | Reference |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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