TPK1 and TPK2 encode both isoforms of protein kinase A (PKA) catalytic subunits in Candida albicans. Mutants lacking both TPK1 alleles showed defective hyphal morphogenesis on solid inducing media, whereas in liquid hypha, formation was affected slightly. In contrast, tpk2 mutants were only partially morphogenesis defective on solid media, whereas a strong block was observed in liquid. In addition, the yeast forms of tpk2-- but not tpk1-- mutants were completely deficient in invading agar. Because Tpk1p and Tpk2p differ in their N-terminal domains of approximately 80--90 amino acids, while the catalytic portions are highly homologous, the functions of hybrid Tpk proteins with exchanged N-terminal domains were tested. The results demonstrate that the catalytic portions mediate Tpk protein specificities with regard to filamentation, whereas agar invasion is mediated by the N-terminal domain of Tpk2p. Homozygous tpk1 and tpk2 mutants grew normally; however, a tpk2 mutant strain containing a single regulatable TPK1 allele (PCK1p-TPK1) at low expression levels was severely growth defective. It was completely blocked in hyphal morphogenesis and was stress resistant to high osmolarities or temperatures. Thus, both Tpk isoforms in C. albicans share growth functions but, unlike Saccharomyces cerevisiae isoforms, they have positive, specific roles in filament formation in different environments.
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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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