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The relative contribution of the two known pyridine nucleotide cycles of Salmonella typhimurium towards the intracellular recycling of nicotinamide adenine dinucleotide was determined. The results indicate that intracellular nicotinamide adenine dinucleotide is recycled by both the four-membered pyridine nucleotide cycle (PNC IV) and the six-membered pyridine nucleotide cycle (PNC VI) with a relative contribution of 60 to 69% and 31 to 40%, respectively. These studies also revealed a nicotinic acid mononucleotide-degradative activity which converts nicotinic acid mononucleotide to nicotinic acid. This represents the first demonstration of a functional PNC IV pathway in S. typhimurium.

Pyridine nucleotide cycle of Salmonella typhimurium: in vivo recycling of nicotinamide adenine dinucleotide