Abstract
Glyoxalase I is a ubiquitous enzyme that catalyzes the conversion of methylglyoxal, a toxic 2-oxoaldehyde derived from glycolysis, to S-D-lactoylglutathione. The activity of glyoxalase I in the fission yeast Schizosaccharomyces pombe was increased by osmotic stress induced by sorbitol. However, neither the mRNA levels of its structural gene nor its protein levels increased under the same conditions. Cycloheximide blocked the induction of glyoxalase I activity in cells exposed to osmotic stress. In addition, glyoxalase I activity was increased in stress-activated protein kinase-deficient mutants (wis1 and spc1). We present evidence for the post-translational regulation of glyoxalase I by osmotic stress in the fission yeast.
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