The mammalian tumor susceptibility gene tsg101 encodes the homologue of Vps23p, a class E Vps protein essential for normal membrane trafficking in the late endosome/multivesicular body of yeast. Both proteins assemble into large (approximately 350 kDa) cytosolic protein complexes and we show that the yeast complex contains another class E Vps protein, Vps28p. tsg101 mutant cells exhibit defects in sorting and proteolytic maturation of the lysosomal hydrolase cathepsin D, as well as in the steady-state distribution of the mannose-6-phosphate receptor. Additionally, endocytosed EGF receptors that are normally sorted to the lysosome are instead rapidly recycled back to the cell surface in tsg101 mutant cells. We propose that tsg101 mutant cells are defective in the delivery of cargo proteins to late endosomal compartments. One consequence of this endosomal trafficking defect is the delayed down-regulation/degradation of activated cell surface receptors, resulting in prolonged signaling. This may contribute to the tumorigenic phenotype exhibited by the tsg101 mutant fibroblasts.
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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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