SEC63 encodes a protein required for secretory protein translocation into the endoplasmic reticulum (ER) of Saccharomyces cerevisiae (J. A. Rothblatt, R. J. Deshaies, S. L. Sanders, G. Daum, and R. Schekman, J. Cell Biol. 109:2641-2652, 1989). Antibody directed against a recombinant form of the protein detects a 73-kDa polypeptide which, by immunofluorescence microscopy, is localized to the nuclear envelope-ER network. Cell fractionation and protease protection experiments confirm the prediction that Sec63p is an integral membrane protein. A series of SEC63-SUC2 fusion genes was created to assess the topology of Sec63p within the ER membrane. The largest hybrid proteins are unglycosylated, suggesting that the carboxyl terminus of Sec63p faces the cytosol. Invertase fusion to a loop in Sec63p that is flanked by two putative transmembrane domains produces an extensively glycosylated hybrid protein. This loop, which is homologous to the amino terminus of the Escherichia coli heat shock protein, DnaJ, is likely to face the ER lumen. By analogy to the interaction of the DnaJ and Hsp70-like DnaK proteins in E. coli, the DnaJ loop of Sec63p may recruit luminal Hsp70 (BiP/GRP78/Kar2p) to the translocation apparatus. Mutations in two highly conserved positions of the DnaJ loop and short deletions of the carboxyl terminus inactivate Sec63p activity. Sec63p associates with several other proteins, including Sec61p, a 31.5-kDa glycoprotein, and a 23-kDa protein, and together with these proteins may constitute part of the polypeptide translocation apparatus. A nonfunctional DnaJ domain mutant allele does not interfere with the formation of the Sec63p/Sec61p/gp31.5/p23 complex.
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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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