The SEC61, SEC62 and SEC63 yeast gene products are membrane components of the apparatus that catalyses protein translocation into the endoplasmic reticulum (ER). In the hope of uncovering additional components of the translocation apparatus, we sought yeast genes whose overexpression would restore partial thermoresistance in a sec61 translocation-deficient mutant. The first extragenic Sec sixty-one suppressor, SSS1, is an essential single copy gene whose overexpression restores translocation in the sec61 mutant. Another extragenic suppressor was identified as TDH3, which encodes the major isozyme of the most abundant yeast protein, glyceraldehyde-3-phosphate dehydrogenase. TDH3 overexpression could exert an indirect effect by competitively inhibiting protein synthesis, thereby allowing the impaired translocation apparatus to cope with a reduced flow of newly synthesized secretory proteins. Depletion of the Sss1 protein rapidly results in accumulation of multiple secretory or membrane proteins devoid of post-translational modifications; the normally secreted alpha-factor accumulates on the cytosolic side of ER membranes. Thus, the SSS1 gene is required for continued translocation of secretory preproteins beyond their early association to ER membranes. Consistent with its essential role in protein translocation, the Sss1 protein localizes to the ER and homologues were detected in higher eukaryotes.
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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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