NMNAT1

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NMNAT1
Protein NMNAT1 PDB 1gzu.png
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesNMNAT1, LCA9, NMNAT, PNAT1, nicotinamide nucleotide adenylyltransferase 1, SHILCA
External IDsOMIM: 608700 MGI: 1913704 HomoloGene: 39074 GeneCards: NMNAT1
Orthologs
SpeciesHumanMouse
Entrez
Ensembl
UniProt
RefSeq (mRNA)

NM_001297778
NM_001297779
NM_022787

NM_133435
NM_001356357

RefSeq (protein)

NP_001284707
NP_001284708
NP_073624

NP_597679
NP_001343286

Location (UCSC)Chr 1: 9.94 – 9.99 Mbn/a
PubMed search[2][3]
Wikidata
View/Edit HumanView/Edit Mouse

Nicotinamide mononucleotide adenylyltransferase 1 (NMNAT1) is an enzyme that in humans is encoded by the NMNAT1 gene.[4][5][6] It is a member of the nicotinamide-nucleotide adenylyltransferases (NMNATs) which catalyze nicotinamide adenine dinucleotide (NAD) synthesis.[7]

Function[edit]

The coenzyme NAD and its derivatives are involved in hundreds of metabolic redox reactions and are utilized in protein ADP-ribosylation, histone deacetylation, and in some Ca2+ signaling pathways. NMNAT (EC 2.7.7.1) is a central enzyme in NAD biosynthesis, catalyzing the condensation of nicotinamide mononucleotide (NMN) or nicotinic acid mononucleotide (NaMN) with the AMP moiety of ATP to form NAD or NaAD.[6]

NMNAT1 is the most widely expressed of three orthologous genes with nicotinamide-nucleotide adenylyltransferase (NMNAT) activity. Genetically engineered mice lacking NMNAT1 die during early embryogenesis, indicating a critical role of this gene in organismal viability.[8] In contrast, mice lacking NMNAT2, which is expressed predominantly in neural tissues, complete development but die shortly after birth. However, NMNAT1 is dispensable for cell viability, as homozygous deletion of this gene occurs in glioblastoma tumors and cell lines. NMNAT enzymatic activity is probably essential at the cellular level, as complete ablation of NMNAT activity in model organisms leads to cellular inviability.[9]

NMNAT1 enhancement opposes the actions of SARM1 which would lead to axon degeneration,[10] but this effect is not due to preventing SARM1 depletion of NAD+.[7]

Clinical relevance[edit]

Mutations in this gene have been shown associated to the LCA9 form of the retinal degeneration pathology Leber's congenital amaurosis.[11][7][12]

Aging[edit]

Aged mice show a significant reduction of NMNAT1 gene products in the liver (which is the main site of de novo synthesis of NAD+).[13] All NMNAT gene isoform products also decline with age in mice in kidneys, oocytes, and colons.[13]

References[edit]

  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000173614 - Ensembl, May 2017
  2. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  3. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ Schweiger M, Hennig K, Lerner F, Niere M, Hirsch-Kauffmann M, Specht T, Weise C, Oei SL, Ziegler M (Mar 2001). "Characterization of recombinant human nicotinamide mononucleotide adenylyl transferase (NMNAT), a nuclear enzyme essential for NAD synthesis". FEBS Lett. 492 (1–2): 95–100. doi:10.1016/S0014-5793(01)02180-9. PMID 11248244.
  5. ^ Emanuelli M, Carnevali F, Saccucci F, Pierella F, Amici A, Raffaelli N, Magni G (Feb 2001). "Molecular cloning, chromosomal localization, tissue mRNA levels, bacterial expression, and enzymatic properties of human NMN adenylyltransferase". J Biol Chem. 276 (1): 406–12. doi:10.1074/jbc.M008700200. PMID 11027696.
  6. ^ a b "Entrez Gene: NMNAT1 nicotinamide nucleotide adenylyltransferase 1".
  7. ^ a b c Brazill JM, Li C, Zhu Y, Zhai RG (2017). "NMNAT: It's an NAD + Synthase… It's a Chaperone… It's a Neuroprotector". Current Opinion in Genetics & Development. 44: 156–162. doi:10.1016/j.gde.2017.03.014. PMC 5515290. PMID 28445802.
  8. ^ Fletcher RS, Lavery GG (2018). "The emergence of the nicotinamide riboside kinases in the regulation of NAD+ metabolism". Journal of Molecular Endocrinology. 61 (3): R107–R121. doi:10.1530/JME-18-0085. PMC 6145238. PMID 30307159.
  9. ^ Muller FL, Colla S, Aquilanti E, et al. (August 2012). "Passenger deletions generate therapeutic vulnerabilities in cancer". Nature. 488 (7411): 337–42. Bibcode:2012Natur.488..337M. doi:10.1038/nature11331. PMC 3712624. PMID 22895339.
  10. ^ Sasaki Y, Nakagawa T, Mao X, DiAntonio A, Milbrandt J (October 2016). "+ depletion". eLife. 5. doi:10.7554/eLife.19749. PMC 5063586. PMID 27735788.
  11. ^ Koenekoop RK, Wang H, Majewski J, Wang X, Lopez I, Ren H, Chen Y, Li Y, Fishman GA, Genead M, Schwartzentruber J, Solanki N, Traboulsi EI, Cheng J, Logan CV, McKibbin M, Hayward BE, Parry DA, Johnson CA, Nageeb M, Poulter JA, Mohamed MD, Jafri H, Rashid Y, Taylor GR, Keser V, Mardon G, Xu H, Inglehearn CF, Fu Q, Toomes C, Chen R (September 2012). Finding of Rare Disease Genes (FORGE) Canada Consortium. "Mutations in NMNAT1 cause Leber congenital amaurosis and identify a new disease pathway for retinal degeneration". Nat. Genet. 44 (9): 1035–9. doi:10.1038/ng.2356. PMC 3657614. PMID 22842230.
  12. ^ Jadeja RN, Thounaojam MC, Martin PM (2020). "Implications of NAD + Metabolism in the Aging Retina and Retinal Degeneration". Oxidative Medicine and Cellular Longevity. 2020: 2692794. doi:10.1155/2020/2692794. PMC 7238357. PMID 32454935.
  13. ^ a b McReynolds MR, Chellappa K, Baur JA (2020). "Age-related NAD + decline". Experimental Gerontology. 134: 110888. doi:10.1016/j.exger.2020.110888. PMC 7442590. PMID 32097708.

Further reading[edit]