Lung contains an inhibitor for nicotinatemononucleotide pyrophosphorylase (carboxylating) of NAD biosynthesis

Richard L. Seither, Olen R. Brown, B. V. Babu

Research output: Contribution to journalArticlepeer-review


Rat, cow and foal lung extracts contained an inhibitor for the liver NAD biosynthetic-pathway enzyme, nicotinatemononucleotide pyrophosphoryase (carboxylating) [EC]. The inhibitor was not dialyzable, was labile at 100°C, was retained by a 30, 000 dalton pore size Amicon membrane and, when partially purified by precipitation at 40-100% ammonium sulfate, inhibited the enzyme stoichiometrically. Lung reportedly does not contain nicotinatemononucleotide pyrophosphorylase or make NAD de novo. However, the inhibitor would mask detection of the enzyme in lung extracts. We detected a low nicotinatemononucleotide pyrophosphorylase-like activity (0.003 ± 0.001 nanomoles CO2 produced from quinolinic acid per mg of extract protein) in rat lung but none in foal or cow lung.

Original languageEnglish (US)
Pages (from-to)253-259
Number of pages7
JournalLife Sciences
Issue number3
StatePublished - 1991
Externally publishedYes

ASJC Scopus subject areas

  • General Biochemistry, Genetics and Molecular Biology
  • Pharmacology, Toxicology and Pharmaceutics(all)


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