We identified a nonpathogenic strain of Ustilago maydis by tagging mutagenesis. The affected gene, glucosidase1 (gas1), displays similarity to catalytic alpha-subunits of endoplasmic reticulum (ER) glucosidase II. We have shown that Gas1 localizes to the ER and complements the temperature-sensitive phenotype of a Saccharomyces cerevisiae mutant lacking ER glucosidase II. gas1 deletion mutants were normal in growth and mating but were more sensitive to calcofluor and tunicamycin. Mutant infection hyphae displayed significant alterations in the distribution of cell wall material and were able to form appressoria and penetrate the plant surface but arrested growth in the epidermal cell layer. Electron microscopy analysis revealed that the plant-fungal interface between mutant hyphae and the plant plasma membrane was altered compared with the interface of penetrating wild-type hyphae. This may indicate that gas1 mutants provoke a plant response.
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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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| Evidence ID | Analyze ID | File | Description |
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