Two GDP-mannose-dependent mannosyltransferase activities (designated M1MT-I and M2MT-I) from Triton X-100 extracts of Saccharomyces cerevisiae mnn1 microsomes were separated by concanavalin A lectin chromatography and partially purified. The two transferases were distinguished by differences in concanavalin A affinity and in carbohydrate acceptor specificity. Analyses of the reaction products indicate that both enzymes are alpha 1,2-mannosyltransferases. M1MT-I utilizes mannose or methyl-alpha-mannoside as acceptor while M2MT-I catalyzes the transfer of mannose from GDP-mannose to unsubstituted nonreducing alpha 1,6-linked mannose residues in the acceptor molecule. M2MT-I activity correlates with the presence of a single alpha 1,2-linked mannose residue at the nonreducing terminus of mnn2mnn9 and mnn2mnn10 outer chain oligosaccharides, and the enzyme may be involved in regulating outer chain elongation.
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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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