Genetic studies have identified a number of proteins required for the internalization of biosynthetic and endocytic cargo proteins transported to the multivesicular body (MVB). We have developed a cell-free reaction that recapitulates the internalization of a yeast biosynthetic membrane cargo protein, carboxypeptidase S (CPS), into the interior of an endosome. A recombinant form of CPS containing a biotinylation site from an Escherichia coli protein is accumulated in a vps27 yeast mutant blocked in the MVB internalization event. Endosomes isolated from the vps27 mutant are exposed to E. coli biotin ligase, which acts on only those CPS molecules with a cytosol-exposed N-terminal domain. Internalization of biotin-tagged CPS is measured by the detection of trypsin-inaccessible, membrane-protected species. Biotinylated CPS internalization requires ATP and functional forms of Vps27p and Vps4p and depends on the availability of an exposed lysine residue critical for CPS ubiquitylation.
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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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| Evidence ID | Analyze ID | File | Description |
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