The Saccharomyces cerevisiae OCH1 gene encodes an alpha-1,6-mannosyltransferase that initiates the polymannose outer chain elongation of N-linked glycans. Transcription of OCH1 is regulated by two transcription factors, Swi4 and Skn7. To learn more about the signals that feed into the Swi4 regulation, we isolated a mutant, bon1-1 (bypass of Skn7), that activates OCH1-HIS3 and OCH1-lacZ reporters in a strain deleted for SKN7. bon1-1 is an allele of CDC4 (cdc4(bon)) and leads to the additional phenotypes of temperature sensitivity and abnormal cell morphology. The cdc4(bon) mutant is partially suppressed by CLB5 overexpression and accumulates Sic1 protein, indicating that OCH1 transcription is controlled by the ubiquitin-dependent degradation pathway through the Skp1-Cdc53-F box(Cdc4) protein complex. We suggest that transcriptional control of OCH1 by cdc4(bon) is through Swi4, because cdc4(bon) cannot activate the OCH1-lacZ reporter in a strain deleted for SWI4. Interestingly, cdc4(bon) and Delta swi4 show a synthetic growth defect when combined.
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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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