The Hog1 MAP kinase pathway regulates stress adaptation in several fungi. To assess its role in stress adaptation in Aspergillus fumigatus, we constructed mutants in genes encoding the sensor histidine kinase (HK) tcsB as well as sakA, which are homologues of the Saccharomyces cerevisiae sln1 and Hog1, respectively. Compared to the wild type strain (Wt), growth of sakA (sakAtriangle up) mutant was reduced, and growth inhibition was increased when H(2)O(2), menadione, or SDS was added to the media. On the other hand, the tcsB mutant (tcsBtriangle up) was similar to the Wt strain in regard to growth and morphology, although a partial sensitivity to SDS was observed. Western blot analysis of Wt and the tcsBtriangle up strains indicated that when stressed with H(2)O(2), phosphorylation of Hog1p still occurs in the mutant. Since in Candida albicans, Hog1 regulates transcription of at least one histidine kinase, we performed RT-PCR of 6 histidine kinase genes as well as the ssk1 and skn7 response regulator genes of A. fumigatus. No significant differences in transcription were observed with the sakAtriangle up when compared to the Wt, indicating that the sakA does not regulate transcription of these genes. Our studies indicate that the A. fumigatus sakA is required for optimal growth of the organism with or without oxidant stress, while tcsB gene is dispensable.
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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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