GDP-mannose is the mannosyl donor for the glycosylation reactions and is synthesized by GDP-mannose pyrophosphorylase from GTP and d-mannose-1-phosphate; in Saccharomyces cerevisiae this enzyme is encoded by the PSA1/VIG9/SRB1 gene. We isolated the Kluyveromyces lactis KlPSA1 gene by complementing the osmotic growth defects of S. cerevisiae srb1/psa1 mutants. KlPsa1p displayed a high degree of similarity with other GDP-mannose pyrophosphorylases and was demonstrated to be the functional homologue of S. cerevisiae Psa1p. Phenotypic analysis of a K. lactis strain overexpressing the KlPSA1 gene revealed changes in the cell wall assembly. Increasing the KlPSA1 copy number restored the defects in O-glycosylation, but not those in N-glycosylation, that occur in K. lactis cells depleted for the hexokinase Rag5p. Overexpression of GDP-mannose pyrophosphorylase also enhanced heterologous protein secretion in K. lactis as assayed by using the recombinant human serum albumin and the glucoamylase from Arxula adeninivorans.
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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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