Human SAP 49, a subunit of the multimeric splicing factor 3b (SF3b), contains two RNA recognition motifs (RRMs) and binds another SF3b subunit called SAP 145, whose yeast homologue is CUS1. Here we show that the predicted yeast open reading frame YOR319w (HSH49) encodes an essential yeast splicing factor. Using bacterially expressed proteins, we find that yeast HSH49 binds CUS1. Mutations that alter putative RNA-binding residues of either HSH49 RRM are lethal in vivo, but do not prevent binding to CUS1 in vitro, suggesting that the predicted RNA-binding surfaces of HSH49 are not required for interaction with CUS1. In vivo interaction tests show that HSH49 and CUS1 associate primarily through the N-terminal RRM of HSH49. Recombinant HSH49 protein has a general RNA-binding activity that does not require CUS1. The parallels in structure and interaction between two SF3b subunits from yeast implies that the mechanism of SF3b action is highly conserved.
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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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