Cited by 137Biochemical and Molecular ResearchSirtuins and Resveratrol in MedicineEnzyme Structure and Function

Structural characterization of a human cytosolic NMN/NaMN adenylyltransferase and implication in human NAD biosynthesis

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Zhang, Xuejun, Kurnasov, Oleg V., Karthikeyan, Subramanian, Grishin, Nick V., Osterman, Andrei L., Zhang, Hong·2003·Journal of Biological Chemistry

Abstract

Pyridine dinucleotides (NAD and NADP) are ubiquitous cofactors involved in hundreds of redox reactions essential for the energy transduction and metabolism in all living cells. In addition, NAD also serves as a substrate for ADP-ribosylation of a number of nuclear proteins, for silent information regulator 2 (Sir2)-like histone deacetylase that is involved in gene silencing regulation, and for cyclic ADP ribose (cADPR)-dependent Ca(2+) signaling. Pyridine nucleotide adenylyltransferase (PNAT) is an indispensable central enzyme in the NAD biosynthesis pathways catalyzing the condensation of pyridine mononucleotide (NMN or NaMN) with the AMP moiety of ATP to form NAD (or NaAD). Here we report the identification and structural characterization of a novel human PNAT (hsPNAT-3) that is located in the cytoplasm and mitochondria. Its subcellular localization and tissue distribution are distinct from the previously identified human nuclear PNAT-1 and PNAT-2. Detailed structural analysis of PNAT-3 in its apo form and in complex with its substrate(s) or product revealed the catalytic mechanism of the enzyme. The characterization of the cytosolic human PNAT-3 provided compelling evidence that the final steps of NAD biosynthesis pathways may exist in mammalian cytoplasm and mitochondria, potentially contributing to their NAD/NADP pool.

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  1. Conforti, L., Tarlton, A., Mack, T. G., Mi, W., Buckmaster, E. A., Wagner, D., Perry, V. H., and Coleman, M. P. (2000) Proc. Natl. Acad. Sci. U. S. A. 97, 11377-11382

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Authors
Zhang, X., Kurnasov, O. V., Karthikeyan, S., Grishin, N. V., Osterman, A. L., & Zhang, H.
Affiliations
  • Howard Hughes Medical Institute (US)
  • Igenbio (United States) (US)
Corresponding author
Zhang, Hong
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2003-04
Volume
278
Issue
15
Pages
13503-13511
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2048878532
Cited by
136
References
55
Citations by year
2026: 2 · 2025: 6 · 2024: 3 · 2023: 5 · 2022: 7 · 2021: 4 · 2020: 10 · 2019: 5 · 2018: 8 · 2017: 4 · 2016: 4 · 2015: 6 · 2014: 4 · 2013: 8 · 2012: 2
FWCI
2.19
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • Welch Foundation
  • McKnight Foundation
  • National Institutes of Health
  • National Institute of General Medical Sciences (R01GM065243, GM65243)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biochemical and Molecular Research
  • Health Sciences › Medicine › Geriatrics and Gerontology › Sirtuins and Resveratrol in Medicine
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
Keywords
NAD biosynthesis, NADPH, nicotinamide mononucleotide, enzyme structure, catalytic mechanism, subcellular localization, mitochondrial enzymes, cytosolic enzyme, ADP-ribosylation, cofactors
MeSH terms
Cell Line, Cytosol, HeLa Cells, Humans, Models, Molecular, NAD, Nicotinamide-Nucleotide Adenylyltransferase, Protein Conformation, Recombinant Proteins, Subcellular Fractions, Transfection, Tumor Cells, Cultured, Protein Structure, Secondary, Crystallography, X-Ray

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