The signal recognition particle (SRP) is required for co-translational targeting of polypeptides to the endoplasmic reticulum (ER). Once at the membrane, the precursor interacts with a complex proteinaceous machinery that mediates its translocation across the bilayer. Genetic studies in yeast have identified a number of genes whose products are involved in this complex process. These mutants offer a potentially valuable resource with which to analyze the biochemical role played by each component in the pathway. However, such analyses have been hampered by the failure to reconstitute an efficient in vitro assay for SRP-dependent translocation. We report the construction of two multicopy vectors that allow overexpression of all seven gene products required to make SRP in the yeast Saccharomyces cerevisiae. The overexpressed subunits assemble into intact and functional SRP particles, and we further demonstrate that in vitro reconstitution of co-translational translocation is greatly enhanced using cytosol from the overexpression strain. We use this assay to demonstrate that Sec63p is required for co-translational translocation in vitro and specifically identify the "J-domain" of Sec63p as crucial for this pathway.
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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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