Abstract
The fission yeast Schizosaccharomyces pombe has a unique organization of sulfur amino acid metabolism: it has two distinct O-acetylhomoserine sulfhydrylases (homocysteine synthases). Similar to Enterobacteriaceae, S. pombe lacks cystathionine beta-synthase and cystathionine gamma-lyase-the enzymes of the reverse transsulfuration pathway, by which methionine is readily metabolized to cysteine-a likely effector in the sulfur metabolite repression system. Consequently no repression of sulfate assimilation is observed when methionine is added to the growth medium.
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