The yeast Saccharomyces cerevisiae temperature-sensitive lethal mutant alg1-1, has been previously shown to lack the activity necessary for the addition of the first mannose residue in the synthesis of lipid-linked precursor oligosaccharide. The gene ALG1 has been cloned by complementation of the temperature-sensitive mutation alg1-1 with a total genomic DNA library. The original DNA fragment isolated was 11,300 base pairs and has been subcloned to a 1,500-base pair fragment which is still capable of complementing alg1-1. The gene ALG1 has been mapped on chromosome II at a distance of 2.1 map units from LYS2. The ALG1 gene product has been shown to catalyze the transfer of a mannosyl residue from GDP-mannose to the lipid-linked acceptor GlcNAc2, yielding Man beta 1-4GlcNAc2-lipid, in lysates from Escherichia coli transformants. This result proves that ALG1 is the structural gene for the first mannosyltransferase in lipid-linked oligosaccharide assembly.
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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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