FB2025_05 , released December 11, 2025
Gene: Dmel\Nmnat
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General Information
Symbol
Dmel\Nmnat
Species
D. melanogaster
Name
Nicotinamide mononucleotide adenylyltransferase
Annotation Symbol
CG13645
Feature Type
FlyBase ID
FBgn0039254
Gene Model Status
Stock Availability
Enzyme Name (EC)
nicotinamide-nucleotide adenylyltransferase (2.7.7.1)
nicotinate-nucleotide adenylyltransferase (2.7.7.18)
Gene Summary
Nicotinamide mononucleotide adenylyltransferase (Nmnat) encodes an essential enzyme in the NAD salvage pathway, catalyzing the last step of NAD synthesis. It is also a neuronal maintenance factor that protects neurons from excitotoxicity, environmental stress and protein misfolding induced degeneration. [Date last reviewed: 2019-03-14] (FlyBase Gene Snapshot)
Also Known As

dNmnat

Key Links
Genomic Location
Cytogenetic map
Sequence location
Recombination map
3-86
RefSeq locus
NT_033777 REGION:24945237..24947400
Sequence
Genomic Maps
Other Genome Views
The following external sites may use different assemblies or annotations than FlyBase.
Function
Gene Ontology (GO) Annotations (15 terms)
Molecular Function (5 terms)
Terms Based on Experimental Evidence (3 terms)
CV Term
Evidence
References
Terms Based on Predictions or Assertions (4 terms)
CV Term
Evidence
References
inferred from electronic annotation with InterPro:IPR004821
inferred from electronic annotation with InterPro:IPR045094
inferred from biological aspect of ancestor with PANTHER:PTN000247701
inferred from sequence or structural similarity with UniProtKB:Q9HAN9
Biological Process (5 terms)
Terms Based on Experimental Evidence (4 terms)
CV Term
Evidence
References
inferred from mutant phenotype
inferred from mutant phenotype
Terms Based on Predictions or Assertions (2 terms)
CV Term
Evidence
References
Cellular Component (5 terms)
Terms Based on Experimental Evidence (4 terms)
CV Term
Evidence
References
located_in cytoplasm
inferred from direct assay
inferred from direct assay
inferred from direct assay
inferred from mutant phenotype
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
located_in mitochondrion
inferred from sequence or structural similarity with UniProtKB:Q96T66
Gene Group (FlyBase)
Protein Family (UniProt)
Belongs to the eukaryotic NMN adenylyltransferase family. (Q9VC03)
Catalytic Activity (EC/Rhea)
nicotinamide-nucleotide adenylyltransferase activity
beta-nicotinamide D-ribonucleotide + ATP + H(+) = diphosphate + NAD(+) (2.7.7.1)
RHEA 21360: nicotinate-nucleotide adenylyltransferase activity
nicotinate beta-D-ribonucleotide + ATP + H(+) = deamido-NAD(+) + diphosphate (2.7.7.18)
RHEA 22860:
Summaries
Gene Snapshot
Nicotinamide mononucleotide adenylyltransferase (Nmnat) encodes an essential enzyme in the NAD salvage pathway, catalyzing the last step of NAD synthesis. It is also a neuronal maintenance factor that protects neurons from excitotoxicity, environmental stress and protein misfolding induced degeneration. [Date last reviewed: 2019-03-14]
Gene Group (FlyBase)
UNCLASSIFIED ADENYLYLTRANSFERASES -
This group comprises adenylyltransferases that do not classify under other groups in FlyBase.
Pathway (FlyBase)
NAD(+) BIOSYNTHESIS VIA THE SALVAGE PATHWAY -
In the nicotinamide adenine dinucleotide (NAD(+)) salvage pathway, NAD(+) is synthesized from the vitamin B3 derivatives nicotinate (NA) and nicotinamide (NAM), and from β-nicotinamide D-riboside (NR) or nicotinate riboside (NAR). These compounds can be acquired either from the diet or as a by-product of NAD(+)-consuming enzymes. NAD(+) synthesis occurs predominantly in the cytosol. NAD(+) is then transported to other organelles including the nucleus and the mitochondrion. NAD(+) can also be phosphorylated to form NADP(+). NAD(+) and NADP(+) form NAD(+)/NADH and NADP(+)/NADPH redox couples that are essential for maintaining cellular redox homeostasis and metabolic processes. The NAD(+)/NADH redox couple is involved in catabolic processes such as glycolysis and mitochondrial oxidative phosphorylation, while the NADP(+)/NADPH redox couple is required for anabolic processes such as fatty acid biosynthesis and oxidative-stress defence. NAD(+) is also an essential co-substrate for NAD(+)-consuming enzymes, including NAD(+) glycohydrolases (e.g. Sarm), protein deacetylase sirtuins, and ADP-ribose polymerases (PARPs). (Adapted from PMID:33353981 and PMID:22404877.)
Protein Function (UniProtKB)
Catalyzes the formation of NAD(+) from nicotinamide mononucleotide (NMN) and ATP (PubMed:17132048, PubMed:19403820). Essential for viability (PubMed:17132048). Stress-response chaperone protein that prevents toxic aggregation of proteins and promotes proteasome-mediated degradation of misfolded proteins; this is independent of its NAD(+) synthesis activity (PubMed:18344983). Neuroprotective in response to toxic protein aggregation, for example by overexpressed Atx-1/ataxin-1 (PubMed:18344983). Required for maintenance and integrity of mature neurons, protecting them from neuronal activity-induced neurodegeneration (PubMed:17132048, PubMed:19403820). Required for the maintenance of axonal and dendritic integrity in both central and peripheral neurons (PubMed:21596138, PubMed:22425156). Chaperone function and neuroprotective roles are largely independent of NAD(+) synthesis activity (PubMed:17132048, PubMed:18344983, PubMed:21596138).
(UniProt, Q9VC03)
Summary (Interactive Fly)

NAD salvage pathway - catalyzing the last step of NAD synthesis - stress response protein - required for thermotolerance and mitigation of oxidative stress-induced shortened lifespan - protects against axonal degeneration through chaperone activity - protects against neurodegeneration through a proteasome-mediated pathway - required for maintaining active zone structural integrity by interacting Bruchpilot - regulated post-transcriptionally by Highwire function

Gene Model and Products
Number of Transcripts
4
Number of Unique Polypeptides
4

Please see the JBrowse view of Dmel\Nmnat for information on other features

To submit a correction to a gene model please use the Contact FlyBase form

Protein Domains (via Pfam)
Isoform displayed:
Pfam protein domains
InterPro name
classification
start
end
Protein Domains (via SMART)
Isoform displayed:
SMART protein domains
InterPro name
classification
start
end
Structure
Protein 3D structure   (Predicted by AlphaFold)   (AlphaFold entry Q9VC03)

If you don't see a structure in the viewer, refresh your browser.
Model Confidence:
  • Very high (pLDDT > 90)
  • Confident (90 > pLDDT > 70)
  • Low (70 > pLDDT > 50)
  • Very low (pLDDT < 50)

AlphaFold produces a per-residue confidence score (pLDDT) between 0 and 100. Some regions with low pLDDT may be unstructured in isolation.

Experimentally Determined Structures
Crossreferences
Comments on Gene Model

Low-frequency RNA-Seq exon junction(s) not annotated.

Gene model reviewed during 5.48

Gene model reviewed during 6.19

Transcript Data
Annotated Transcripts
Name
FlyBase ID
RefSeq ID
Length (nt)
Assoc. CDS (aa)
FBtr0084749
1287
389
FBtr0084750
1236
297
FBtr0337012
1251
358
FBtr0473366
1200
266
Additional Transcript Data and Comments
Reported size (kB)
Comments
External Data
Crossreferences
Polypeptide Data
Annotated Polypeptides
Name
FlyBase ID
Predicted MW (kDa)
Length (aa)
Theoretical pI
UniProt
RefSeq ID
GenBank
FBpp0084124
43.8
389
8.83
FBpp0084125
33.5
297
9.03
FBpp0422970
29.7
266
6.95
Polypeptides with Identical Sequences

None of the polypeptides share 100% sequence identity.

Additional Polypeptide Data and Comments
Reported size (kDa)
Comments
External Data
Domain

The N-terminal region, which includes the putative catalytic motif, is not required for chaperone activity.

The C-terminal region, which includes a putative ATP binding motif, is required for efficient chaperone activity.

(UniProt, Q9VC03)
Linkouts
Sequences Consistent with the Gene Model
Mapped Features

Click to get a list of regulatory features (enhancers, TFBS, etc.) and gene disruptions (point mutations, indels, etc.) within or overlapping Dmel\Nmnat using the Feature Mapper tool.

External Data
Crossreferences
Eukaryotic Promoter Database - A collection of databases of experimentally validated promoters for selected model organisms.
Linkouts
Expression Data
Testis-specificity index

The testis specificity index was calculated from modENCODE tissue expression data by Vedelek et al., 2018 to indicate the degree of testis enrichment compared to other tissues. Scores range from -2.52 (underrepresented) to 5.2 (very high testis bias).

0.84

Transcript Expression
in situ
Stage
Tissue/Position (including subcellular localization)
Reference
organism

Comment: maternally deposited

Additional Descriptive Data
Marker for
 
Subcellular Localization
CV Term
Polypeptide Expression
Additional Descriptive Data
Marker for
 
Subcellular Localization
CV Term
Evidence
References
located_in cytoplasm
inferred from direct assay
inferred from direct assay
inferred from direct assay
inferred from mutant phenotype
Expression Deduced from Reporters
High-Throughput Expression Data
Associated Tools

JBrowse - Visual display of RNA-Seq signals

View Dmel\Nmnat in JBrowse
RNA-Seq by Region - Search RNA-Seq expression levels by exon or genomic region
Reference
See Gelbart and Emmert, 2013 for analysis details and data files for all genes.
Developmental Proteome: Life Cycle
Developmental Proteome: Embryogenesis
External Data and Images
Linkouts
BDGP expression data - Patterns of gene expression in Drosophila embryogenesis
DRscDB - A single-cell RNA-seq resource for data mining and data comparison across species
EMBL-EBI Single Cell Expression Atlas - Single cell expression across species
FlyAtlas - Adult expression by tissue, using Affymetrix Dros2 array
FlyAtlas2 - A Drosophila melanogaster expression atlas with RNA-Seq, miRNA-Seq and sex-specific data
Fly-FISH - A database of Drosophila embryo and larvae mRNA localization patterns
Flygut - An atlas of the Drosophila adult midgut
Images
Alleles, Insertions, Transgenic Constructs, and Aberrations
Classical and Insertion Alleles ( 14 )
For All Classical and Insertion Alleles Show
 
Other relevant insertions
Transgenic Constructs ( 25 )
For All Alleles Carried on Transgenic Constructs Show
Transgenic constructs containing/affecting coding region of Nmnat
Transgenic constructs containing regulatory region of Nmnat
Aberrations (Deficiencies and Duplications) ( 0 )
Inferred from experimentation ( 0 )
Inferred from location ( 5 )
Variants
Variant Molecular Consequences
Alleles Representing Disease-Implicated Variants
Phenotypes
For more details about a specific phenotype click on the relevant allele symbol.
Lethality
Allele
Other Phenotypes
Allele
Phenotype manifest in
Allele
Orthologs
Human Orthologs (via DIOPT v9.1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
Homo sapiens (Human) (3)
12 of 14
Yes
Yes
2  
12 of 14
Yes
Yes
1  
8 of 14
No
Yes
6  
Model Organism Orthologs (via DIOPT v9.1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
Rattus norvegicus (Norway rat) (3)
12 of 14
Yes
Yes
12 of 14
Yes
Yes
8 of 14
No
Yes
Mus musculus (laboratory mouse) (3)
13 of 14
Yes
Yes
 
2  
12 of 14
No
Yes
 
5  
7 of 14
No
Yes
2  
Xenopus tropicalis (Western clawed frog) (3)
8 of 13
Yes
Yes
5 of 13
No
Yes
2 of 13
No
No
Danio rerio (Zebrafish) (3)
13 of 14
Yes
Yes
11 of 14
No
Yes
8 of 14
No
Yes
Caenorhabditis elegans (Nematode, roundworm) (2)
13 of 14
Yes
Yes
13 of 14
Yes
Yes
Anopheles gambiae (African malaria mosquito) (2)
11 of 12
Yes
Yes
Arabidopsis thaliana (thale-cress) (1)
11 of 13
Yes
Yes
Saccharomyces cerevisiae (Brewer's yeast) (2)
12 of 13
Yes
Yes
12 of 13
Yes
Yes
Schizosaccharomyces pombe (Fission yeast) (1)
11 of 12
Yes
Yes
Escherichia coli (enterobacterium) (1)
4 of 11
Yes
Yes
Other Organism Orthologs (via OrthoDB)
Data provided directly from OrthoDB:Nmnat. Refer to their site for version information.
Paralogs
Paralogs (via DIOPT v9.1)
Human Disease Associations
FlyBase Human Disease Model Reports
Disease Ontology (DO) Annotations
Models Based on Experimental Evidence ( 1 )
Allele
Disease
Evidence
References
Potential Models Based on Orthology ( 2 )
Modifiers Based on Experimental Evidence ( 8 )
Allele
Disease
Interaction
References
Disease Associations of Human Orthologs (via DIOPT v9.1 and OMIM)
Note that ortholog calls supported by only 1 or 2 algorithms (DIOPT score < 3) are not shown.
Functional Complementation Data
Functional complementation data is computed by FlyBase using a combination of the orthology data obtained from DIOPT and OrthoDB and the allele-level genetic interaction data curated from the literature.
Dmel gene
Ortholog showing functional complementation
Supporting References
Interactions
Summary of Physical Interactions
Summary of Genetic Interactions
Interaction Browsers

Please look at the allele data for full details of the genetic interactions
Starting gene(s)
Interaction type
Interacting gene(s)
Reference
Starting gene(s)
Interaction type
Interacting gene(s)
Reference
External Data
Linkouts
BioGRID - A database of protein and genetic interactions.
DroID - A comprehensive database of gene and protein interactions.
MIST (protein-protein) - An integrated Molecular Interaction Database
Pathways
Signaling Pathways (FlyBase)
Metabolic Pathways
External Links
KEGG Metabolic Pathways - A collection of manually drawn metabolic pathway maps representing knowledge of molecular interaction, reaction and relation networks.
Reactome Metabolic Pathways - An open-source, open access, manually curated and peer-reviewed metabolic pathway database.
External Data
Linkouts
KEGG Pathways - A collection of manually drawn pathway maps representing knowledge of molecular interaction, reaction and relation networks.
Reactome - An open-source, open access, manually curated and peer-reviewed pathway database.
Class of Gene
Genomic Location and Detailed Mapping Data
Chromosome (arm)
3R
Recombination map
3-86
Cytogenetic map
Sequence location
FlyBase Computed Cytological Location
Cytogenetic map
Evidence for location
96B11-96B11
Limits computationally determined from genome sequence between P{PZ}ssh01207 and P{lacW}OstStt3j2D9
Experimentally Determined Cytological Location
Cytogenetic map
Notes
References
Experimentally Determined Recombination Data
Location
Left of (cM)
Right of (cM)
Notes
Stocks and Reagents
Stocks (21)
Genomic Clones (11)
 

Please Note FlyBase no longer curates genomic clone accessions so this list may not be complete

cDNA Clones (19)
 

Please Note This section lists cDNAs and ESTs that fall within the genomic extent of the gene model, which may include cDNAs and ESTs of genes within introns, or of overlapping genes. Please see JBrowse for alignment of the cDNAs and ESTs to the gene model.

cDNA clones, fully sequenced
BDGP DGC clones
Other clones
    Drosophila Genomics Resource Center cDNA clones

    For each fully sequenced cDNA the DGRC maintains various forms of the cDNA (e.g tagged or untagged) in several different host vectors for subsequent cloning and expression in Drosophila and Drosophila cell lines.

    cDNA Clones, End Sequenced (ESTs)
    BDGP DGC clones
    RNAi and Array Information
    Linkouts
    DRSC - Results frm RNAi screens
    Antibody Information
    Laboratory Generated Antibodies
     

    monoclonal

    Commercially Available Antibodies
     
    Cell Line Information
    Publicly Available Cell Lines
     
      Other Stable Cell Lines
       
        Other Comments

        Nmnat is cell-autonomously required for maintaining type-specific dendritic coverage of dendritic arborization (da) sensory neurons.

        Loss of Nmnat affects the axons of all classes of da neurons demonstrating its function in maintaining axonal integrity is not restricted to distinct neuronal subtypes.

        Relationship to Other Genes
        Source for database merge of
        Additional comments
        Nomenclature History
        Source for database identify of

        Source for identity of: Nmnat CG13645

        Nomenclature comments
        Etymology
        Synonyms and Secondary IDs (20)
        Reported As
        Symbol Synonym
        Name Synonyms
        Nicotinamide mononucleotide
        Nicotinamide mononucleotide adenylyltransferase
        Nicotinamide mononucleotide adenylytransferase
        adenylyltransferase
        nicotinamide mononucleotide adenyltransferase
        nicotinamide mononucleotide adenylyl transferase 1
        nicotinamide mononucleotide adenylyltransferase
        nicotinamide mononucleotide adenylyltransferase 1
        Secondary FlyBase IDs
          Datasets (0)
          Study focus (0)
          Experimental Role
          Project
          Project Type
          Title
          Study result (0)
          Result
          Result Type
          Title
          External Crossreferences and Linkouts ( 59 )
          Sequence Crossreferences
          NCBI Gene - Gene integrates information from a wide range of species. A record may include nomenclature, Reference Sequences (RefSeqs), maps, pathways, variations, phenotypes, and links to genome-, phenotype-, and locus-specific resources worldwide.
          GenBank Nucleotide - A collection of sequences from several sources, including GenBank, RefSeq, TPA, and PDB.
          GenBank Protein - A collection of sequences from several sources, including translations from annotated coding regions in GenBank, RefSeq and TPA, as well as records from SwissProt, PIR, PRF, and PDB.
          RefSeq - A comprehensive, integrated, non-redundant, well-annotated set of reference sequences including genomic, transcript, and protein.
          UniProt/GCRP - The gene-centric reference proteome (GCRP) provides a 1:1 mapping between genes and UniProt accessions in which a single 'canonical' isoform represents the product(s) of each protein-coding gene.
          UniProt/Swiss-Prot - Manually annotated and reviewed records of protein sequence and functional information
          Other crossreferences
          AlphaFold DB - AlphaFold provides open access to protein structure predictions for the human proteome and other key proteins of interest, to accelerate scientific research.
          BDGP expression data - Patterns of gene expression in Drosophila embryogenesis
          DRscDB - A single-cell RNA-seq resource for data mining and data comparison across species
          EMBL-EBI Single Cell Expression Atlas - Single cell expression across species
          FlyAtlas2 - A Drosophila melanogaster expression atlas with RNA-Seq, miRNA-Seq and sex-specific data
          FlyMine - An integrated database for Drosophila genomics
          KEGG Genes - Molecular building blocks of life in the genomic space.
          MARRVEL_MODEL - MARRVEL (model organism gene)
          Linkouts
          BioGRID - A database of protein and genetic interactions.
          Drosophila Genomics Resource Center - Drosophila Genomics Resource Center (DGRC) cDNA clones
          DroID - A comprehensive database of gene and protein interactions.
          DRSC - Results frm RNAi screens
          Eukaryotic Promoter Database - A collection of databases of experimentally validated promoters for selected model organisms.
          FlyAtlas - Adult expression by tissue, using Affymetrix Dros2 array
          FlyCyc Genes - Genes from a BioCyc PGDB for Dmel
          Fly-FISH - A database of Drosophila embryo and larvae mRNA localization patterns
          Flygut - An atlas of the Drosophila adult midgut
          FlyMet - A comprehensive tissue-specific metabolomics resource for Drosophila.
          iBeetle-Base - RNAi phenotypes in the red flour beetle (Tribolium castaneum)
          Interactive Fly - A cyberspace guide to Drosophila development and metazoan evolution
          KEGG Metabolic Pathways - A collection of manually drawn metabolic pathway maps representing knowledge of molecular interaction, reaction and relation networks.
          KEGG Pathways - A collection of manually drawn pathway maps representing knowledge of molecular interaction, reaction and relation networks.
          MIST (protein-protein) - An integrated Molecular Interaction Database
          Reactome - An open-source, open access, manually curated and peer-reviewed pathway database.
          Reactome Metabolic Pathways - An open-source, open access, manually curated and peer-reviewed metabolic pathway database.
          References (108)