Total cell mannoprotein was isolated from Saccharomyces cerevisiae X2180 mutants that have defects in elongation of the outer chain attached to the N-linked core oligosaccharides (mnn7, mnn8, mnn9, and mnn10) (Ballou, L., Cohen, R. E., and Ballou, C. E. (1980) J. Biol. Chem. 255, 5986-5991). Comparison of the oligosaccharides released by endoglucosaminidase H digestion confirmed that the mnn9 mutation eliminates all but two mannoses of the outer chain, whereas the mnn8 and mnn10 strains produce outer chains of variable but similar lengths. The isolate designated mnn7 was found to be allelic with mnn8. Haploid mutants of the type mnn8 mnn9 or mnn9 mnn10 had the mnn9 phenotype, which established that the mnn9 defect is dominant and presumably acts at a processing step prior to the steps affected by mnn8 and mnn10. Analysis of the mnn1 mnn2 mnn10 oligosaccharides revealed that the heterogeneous outer chain contained 6-16 alpha 1----6-linked mannose units and each was terminated by a single alpha 1----2-linked mannose unit, whereas the core lacked one such unit that was present in the mnn9 oligosaccharide. The results are consistent with and support the hypothesis (Gopal, P. K., and Ballou, C. E. (1988) Proc. Natl. Acad. Sci. U.S.A. 84, 8824-8828) that addition of such a side-chain mannose unit is associated with termination of outer chain elongation in these mutants and may serve as a stop signal that regulates outer chain synthesis in the parent wild-type strain.
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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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