Protein families are generated by successive rounds of gene duplication and subsequent diversification. However, the paths by which duplicated genes acquire distinct functions are not well characterized. We focused on a pair of duplicated deacetylases from Saccharomyces cerevisiae, Sir2 and Hst1, that subfunctionalized after duplication. As a proxy for the ancestral, nonduplicated deacetylase, we studied Sir2 from another yeast, Kluyveromyces lactis. We compared the interaction domains of these deacetylases for the Sir transcriptional silencing complex, which acts with ScSir2, and the Sum1 repressor, which acts with ScHst1, and found that these interaction domains have been retained over the course of evolution and can be disrupted by simple amino acid substitutions. Therefore, Sir2 and Hst1 subfunctionalized by acquiring complementary inactivating mutations in these interaction domains.
|Evidence ID||Analyze ID||Interactor||Interactor Systematic Name||Interactor||Interactor Systematic Name||Type||Assay||Annotation||Action||Modification||Phenotype||Source||Reference||Note|
|Evidence ID||Analyze ID||Gene||Gene Systematic Name||Gene Ontology Term||Gene Ontology Term ID||Qualifier||Aspect||Method||Evidence||Source||Assigned On||Annotation Extension||Reference|
|Evidence ID||Analyze ID||Gene||Gene Systematic Name||Phenotype||Experiment Type||Experiment Type Category||Mutant Information||Strain Background||Chemical||Details||Reference|
|Evidence ID||Analyze ID||Regulator||Regulator Systematic Name||Target||Target Systematic Name||Experiment||Assay||Construct||Conditions||Strain Background||Reference|