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. 1981 Feb;145(2):1002–1009. doi: 10.1128/jb.145.2.1002-1009.1981

Pyridine nucleotide cycle of Salmonella typhimurium: in vitro demonstration of nicotinamide adenine dinucleotide glycohydrolase, nicotinamide mononucleotide glycohydrolase, and nicotinamide adenine dinucleotide pyrophosphatase activities.

J W Foster
PMCID: PMC217210  PMID: 6109709

Abstract

Extracts of Salmonella typhimurium were chromatographed by using Sephadex G-150 to separate the various enzymes involved with pyridine nucleotide cycle metabolism. This procedure revealed a previously unsuspected nicotinamide adenine dinucleotide (NAD) glycohydrolase (EC 3.2.2.5) activity, which was not observed in crude extracts. In contrast to NAd glycohydrolase, NAD pyrophosphatase (EC 3.6.1.22) was readily measured in crude extracts. This enzyme possessed a native molecular weight of 120,000. Other enzymes examined included nicotinamide mononucleotide (NMN) deamidase (EC 3.5.1.00), molecular weight of 43,000; NMN glycohydrolase (EC 3.2.2.14), molecular weight of 67,000; nicotinic acid phosphoribosyl transferase (EC 2.4.2.11), molecular weight of 47,000; and nicotinamide deamidase (EC 3.5.1.19), molecular weight of 35,000. NMN deamidase and NMN glycohydrolase activities were both examined for end product repression by measuring their activities in crude extracts prepared from cells grown with and without 10(-5) M nicotinic acid. No repression was observed with either activity. Both activities were also examined for feedback inhibition by NAD, reduced NAD, and NADP. NMN deamidase was unaffected by any of the compounds tested. NMN glycohydrolase was greatly inhibited by NAD and reduced NAD, whereas NADP was much less effective. Inhibition of NMN glycohydrolase was found to level off at an NAD concentration of ca. 1 mN, the approximate intracellular concentration of NAD.

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Selected References

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