The mak7-1 mutant loses the killer toxin-encoding M1 dsRNA. MAK7 is RPL4A, one of two genes encoding ribosomal protein L4. KRB1 is a dominant suppressor of mak7-1 that is tightly centromerelinked, but not linked to centromere markers of chromosomes I-XVI. Our orthogonal field agarose gel electrophoresis analysis of chromosomal DNA from strains with KRB1 shows a novel band of approximately 250 kb. This band hybridizes with an RPL4B-specific probe, but not an RPL4A (MAK7)-specific probe. The RPL4B-specific probe also hybridizes to chromosome XII where the original RPL4B is located. KRB1 is meiotically linked to this extra chromosome. Disruption of either the RPL4B gene on chromosome XII or that on the extra chromosome results in loss of the killer phenotype and a decreased concentration of free 60S subunits. Thus, the RPL4B on the extra chromosome is KRB1 and is active. The extra chromosome contains chromosome XII sequence between Lambda 5345 clone (ATCC70558) and Lambda 6639 clone (ATCC71085) of Olson's Lambda library, indicating that KRB1 represents a chromosomal rearrangement involving chromosome XII and explaining the earlier genetic data.
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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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