The PNM2- mutation of Saccharomyces cerevisiae eliminates the extrachromosomal element psi. PNM2 is closely linked to the omnipotent suppressor gene SUP35 (also previously identified as SUP2, SUF12, SAL3 and GST1). We cloned PNM2- and showed that PNM2 and SUP35 are the same gene. We sequenced the PNM2- mutant allele and found a single G-->A transition within the N-terminal domain of the protein. We tested the effects of various constructs of SUP35 and PNM2- on psi inheritance and on allosuppressor and antisuppressor functions of the gene. We found that the C-terminal domain of SUP35 protein (SUP35p) could be independently expressed; expression produced dominant antisuppression. Disruption of the N-terminal domain of PNM2- destroyed the ability to eliminate psi. These results imply that the domains of SUP35p act in an antagonistic manner: the N-terminal domain decreases chain-termination fidelity, while the C-terminal domain imposes fidelity. Two transcripts were observed for SUP35, a major band at 2.4 kb and a minor band at 1.3 kb; the minor band corresponds to 3' sequences only. We propose a model for the function of SUP35, in which comparative levels of N- and C-terminal domains of SUP35p at the ribosome modulate translation fidelity.
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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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