Cited by 509Sirtuins and Resveratrol in MedicineBiochemical and Molecular ResearchCalcium signaling and nucleotide metabolism

Subcellular compartmentation and differential catalytic properties of the three human nicotinamide mononucleotide adenylyltransferase isoforms

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Berger, Felicitas, Lau, Corinna, Dahlmann, Mathias, Ziegler, Mathias·2005·Journal of Biological Chemistry

Abstract

Nicotinamide mononucleotide adenylyltransferase (NMNAT) is the central enzyme of the NAD biosynthetic pathway. Three human NMNAT isoforms have recently been identified, but isoform-specific functions are presently unknown, although a tissue-specific role has been suggested. Analyses of the subcellular localization confirmed NMNAT1 to be a nuclear protein, whereas NMNAT2 and -3 were localized to the Golgi complex and the mitochondria, respectively. This differential subcellular localization points to an organelle-specific, nonredundant function of each of the three proteins. Comparison of the kinetic properties showed that particularly NMNAT3 exhibits a high tolerance toward substrate modifications. Moreover, as opposed to preferred NAD+ synthesis by NMNAT1, the other two isoforms could also form NADH directly from the reduced nicotinamide mononucleotide, supporting a hitherto unknown pathway of NAD generation. A variety of physiological intermediates was tested and exerted only minor influence on the catalytic activities of the NMNATs. However, gallotannin was found to be a potent inhibitor, thereby compromising its use as a specific inhibitor of poly-ADP-ribose glycohydrolase. The presence of substrate-specific and independent nuclear, mitochondrial, and Golgi-specific NAD biosynthetic pathways is opposed to the assumption of a general cellular NAD pool. Their existence appears to be consistent with important compartment-specific functions rather than to reflect simple functional redundance.

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Crossref · 10.1074/jbc.m508660200

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Authors
Berger, F., Lau, C., Dahlmann, M., & Ziegler, M.
Affiliations
  • Freie Universität Berlin (DE)
  • University of Bergen (NO)
Corresponding author
Ziegler, Mathias
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2005-10
Volume
280
Issue
43
Pages
36334-36341
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2068128334
Cited by
508
References
52
Citations by year
2026: 14 · 2025: 30 · 2024: 36 · 2023: 23 · 2022: 29 · 2021: 40 · 2020: 39 · 2019: 35 · 2018: 39 · 2017: 21 · 2016: 22 · 2015: 23 · 2014: 16 · 2013: 23 · 2012: 20
FWCI
4.24
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Geriatrics and Gerontology › Sirtuins and Resveratrol in Medicine
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biochemical and Molecular Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Calcium signaling and nucleotide metabolism
Keywords
nicotinamide mononucleotide adenylyltransferase, NAD biosynthesis, subcellular compartmentalization, Golgi apparatus, mitochondria, nuclear localization, enzyme kinetics, substrate tolerance, NADH production, gallotannins, functional redundancy
MeSH terms
Adenosine Triphosphate, Catalysis, Cell Line, Cell Nucleus, Cloning, Molecular, Glycoside Hydrolases, Golgi Apparatus, HeLa Cells, Humans, Kinetics, Nicotinamide-Nucleotide Adenylyltransferase, Poly(ADP-ribose) Polymerases, Protein Conformation, Substrate Specificity, Time Factors, Tissue Distribution, DNA, Complementary, Protein Isoforms, Catalytic Domain, Hydrolyzable Tannins

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