Oligosaccharyltransferase has been purified from canine microsomal membranes as a protein complex with three nonidentical subunits of 66, 63/64, and 48 kDa. The 66- and 63/64-kDa subunits were found to be identical to ribophorins I and II, respectively. The ribophorins are integral membrane glycoproteins that were previously shown to be localized exclusively to the rough endoplasmic reticulum. The 48-kDa subunit (OST48) of the oligosaccharyltransferase complex is not a glycoprotein and is not recognized by antibodies to either ribophorin. Here, we describe the characterization of a cDNA clone that encodes OST48. Like ribophorins I and II, OST48 was found to be an integral membrane protein, with the majority of the polypeptide located within the lumen of the endoplasmic reticulum. OST48 does not show significant amino acid sequence homology to either ribophorin I or II. A 45-kDa integral membrane protein, designated WBP1, from the yeast Saccharomyces cerevisiae was found to be 25% identical in sequence to OST48. Recently, WBP1 was shown to be essential for in vivo and in vitro expression of oligosaccharyltransferase activity in yeast. We conclude that OST48 and WBP1 are homologous gene products.
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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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