The MPT5/HTR1/UTH4/PUF5 gene encodes an RNA-binding Puf-family protein in Saccharomyces cerevisiae. The Deltampt5 cells exhibit pleiotropic phenotypes, including the G2/M arrest of the cell cycle and weakened cell wall at high temperatures. The Deltampt5 disruptant was also hydroxyurea (HU) sensitive. In this study we screened deletion suppressors to rescue the temperature sensitivity of Deltampt5, and identified dsf1 (YEL070W), dsf2 (YBR007C), sir2, sir3, sir4 and swe1. Multicopy suppressors identified were PKC1 and its upstream genes, but not the downstream MAPK cascade genes. The overexpression of PKC1, however, did not suppress the HU sensitivity of Deltampt5. In contrast, both the HU- and temperature-sensitivities of a-type Deltampt5 cells were suppressed by each sir deletion or a multicopy of MATalpha2, suggesting that a diploid-type expression is involved. We found that a diploid-specific IME4 gene encoding an RNA-modifying protein was responsible for the suppression of the temperature sensitivity, but not of the HU sensitivity. Furthermore, the suppression of the HU sensitivity depended on PUF4, another Puf-family gene, and overexpression of PUF4 suppressed only the HU sensitivity of Deltampt5. The protein level of Puf4 was not affected by the sir mutation. Thus, these Ime4 and Puf4 proteins play complementary roles to rescue the defects in Deltampt5 Deltasir cells.
|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||Reference||Annotation Extension|
|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||Conditions||Strain||Source||Reference|