The Saccharomyces cerevisiae MNN4 gene, which is involved in mannosylphosphate transfer from GDP-mannose to N-linked oligosaccharide, has been cloned from a lambda phage containing a yeast chromosome XI DNA fragment. The MNN4 ORF encodes a protein of 1178 amino acids. The deduced amino acid sequence shows a topology of type II membrane proteins and has a unique repeated sequence of lysine and glutamic acid at the C-terminus. Disruption and overexpression of MNN4 led to a decrease and increase, respectively, of the mannosylphosphate content in cell wall mannans prepared from both mnn4 and wild type strains. A dramatic decrease of mannosylphosphate occurs in delta mnn4 mutans. The results from genetic and biochemical experiments combine to suggest that Mnn4p is required to mediate mannosylphosphate transfer in both the core and outer chain portions of N-linked oligosaccharides.
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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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