S-adenosyl-l-methionine (AdoMet) is a molecule central to general metabolism, serving as a principal methyl donor for methylation of various cellular constituents. The alteration in the availability of AdoMet has profound effect on cell growth. A mutant allele of Saccharomyces cerevisiae gene SAH1 encoding S-adenosyl-l-homocysteine (AdoHcy) hydrolase, was isolated as a mutation that suppressed the Ca(2+)-sensitive phenotypes of the zds1Delta strain, such as the Ca(2+)-induced, Swe1p- and Cln2p-mediated G(2) cell-cycle arrest, and polarized bud growth. The mutation (sah1-1) led the cells to accumulate AdoMet besides AdoHcy, the substrate of Sah1p. The cells treated with exogenous AdoMet and AdoHcy had markedly decreased levels of SWE1 and CLN2 mRNA, providing the basis for the suppression of the Ca(2+) sensitivity by the sah1-1 mutation. Exogenous AdoMet transiently led the cells to G(1) cell-cycle delay whereas AdoHcy caused growth inhibition irrelevant to the cell cycle. The effect of AdoMet in inducing the cell-cycle delay was exerted in a manner independent of Met4p, an overall transcriptional activator for MET genes. Our observation provides an insight into the role played by AdoMet in cell cycle regulation.
|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|