A characteristic feature of the co-translational protein translocation into the endoplasmic reticulum (ER) is the tight association of the translating ribosomes with the translocation sites in the membrane. Biochemical analyses identified the Sec61 complex as the main ribosome receptor in the ER of mammalian cells. Similar experiments using purified homologues from the yeast Saccharomyces cerevisiae, the Sec61p complex and the Ssh1p complex, respectively, demonstrated that they bind ribosomes with an affinity similar to that of the mammalian Sec61 complex. However, these studies did not exclude the presence of other proteins that may form abundant ribosome binding sites in the yeast ER. We now show here that similar to the situation found in mammals in the yeast Saccharomyces cerevisiae the two Sec61-homologues Sec61p and Ssh1p are essential for the formation of high-affinity ribosome binding sites in the ER membrane. The number of binding sites formed by Ssh1p under standard growth conditions is at least 4 times less than those formed by Sec61p.
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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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