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J Bacteriol. 1994 October; 176(20): 6407-6409

research-article

The presence of an active S-adenosylmethionine decarboxylase gene increases the growth defect observed in Saccharomyces cerevisiae mutants unable to synthesize putrescine, spermidine, and spermine.

Laboratory of Biochemical Pharmacology, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892.

ABSTRACT

Saccharomyces cerevisiae spe1 delta SPE2 mutants (lacking ornithine decarboxylase) and spe1 delta spe2 delta mutants (lacking both ornithine decarboxylase and S-adenosylmethionine decarboxylase) are equally unable to synthesize putrescine, spermidine, and spermine and require spermidine or spermine for growth in amine-free media. The cessation of growth, however, occurs more rapidly in spe1 delta SPE2 cells than in SPE1 spe2 delta or spe1 delta spe2 delta cells. Since spe1 delta SPE2 cells can synthesize decarboxylated adenosylmethionine (dcAdoMet), these data indicate that dcAdoMet may be toxic to amine-deficient cells.

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