J. Bacteriol., 03 1996, 1476-1479, Vol 178, No. 5
Copyright © 1996, American Society for Microbiology

Involvement of the oxidative pentose phosphate pathway in thiamine biosynthesis in Salmonella typhimurium

JL Enos-Berlage and DM Downs
Department of Bacteriology, University of Wisconsin--Madison 53706, USA.

purF mutants of Salmonella typhimurium are known to require a source of both purine and thiamine; however, exogenous pantothenate may be substituted for the thiamine requirement. We show here that the effect of pantothenate is prevented by blocks in the oxidative pentose phosphate pathway, gnd (encoding gluconate 6-phosphate [6-P] dehydrogenase) or zwf (encoding glucose 6-P dehydrogenase). We further show that the defects caused by these mutations can be overcome by increasing ribose 5-P, suggesting that ribose 5-P may play a role in the ability of pantothenate to substitute for thiamine.

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