Previous genetic evidence led to the conclusion that proteinase B of yeast was not involved in the function of chitin synthetase 1 (Chs1), based on the demonstration of normal septum formation, cell division and chitin deposition in mutants devoid of the proteinase (Zubenko, G.S., Mitchell, A.P., and Jones, E.W. (1979) Proc. Natl. Acad. Sci. USA 76, 2395-2399). Later, however, it was found that the essential enzyme for septum formation is chitin synthetase 2, whereas Chs1 acts as an auxiliary enzyme, whose absence results in daughter cell lysis under acidic conditions (Cabib, E., Sburlati, A., Bowers, B. and Silverman, S.J. (1989) J. Cell Biol. 108, 1665-1672). By using the lytic behavior as a criterion, we have now found that prb1 strains are not defective in Chs1 function. Certain strains contain a recessive suppressor of lysis which could mask the Chs1 defect. However, appropriate crosses and transformation experiments showed that the prb1 mutants do not harbor the suppressor. It may now be concluded with confidence that proteinase B is not required for chitin synthetase 1 function.
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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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