FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Gene: Dmel\mt:ND2
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General Information
Symbol
Dmel\mt:ND2
Species
D. melanogaster
Name
mitochondrial NADH-ubiquinone oxidoreductase chain 2
Annotation Symbol
CG34063
Feature Type
FlyBase ID
FBgn0013680
Gene Model Status
Stock Availability
Enzyme Name (EC)
NADH:ubiquinone reductase (H(+)-translocating) (7.1.1.2)
Gene Summary
Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) that is believed to belong to the minimal assembly required for catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone (By similarity). (UniProt, P03896)
Contribute a Gene Snapshot for this gene.
Also Known As

ND2, dND2, NADH dehydrogenase subunit 2, nad2

Key Links
Genomic Location
Cytogenetic map
Sequence location
Recombination map
RefSeq locus
NC_024511 REGION:240..1263
Sequence
Genomic Maps
Other Genome Views
The following external sites may use different assemblies or annotations than FlyBase.
Function
Gene Ontology (GO) Annotations (4 terms)
Molecular Function (1 term)
Terms Based on Experimental Evidence (0 terms)
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
Biological Process (1 term)
Terms Based on Experimental Evidence (0 terms)
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
inferred from electronic annotation with InterPro:IPR003917, InterPro:IPR010933
inferred from biological aspect of ancestor with PANTHER:PTN001865432
inferred by curator from GO:0045271
Cellular Component (2 terms)
Terms Based on Experimental Evidence (1 term)
CV Term
Evidence
References
inferred from direct assay
inferred from mutant phenotype
Terms Based on Predictions or Assertions (2 terms)
CV Term
Evidence
References
inferred by curator from GO:0045271
inferred from sequence or structural similarity with UniProtKB:P03891
non-traceable author statement
inferred from biological aspect of ancestor with PANTHER:PTN001865432
Pathway (FlyBase)
Protein Family (UniProt)
Belongs to the complex I subunit 2 family. (P03896)
Catalytic Activity (EC/Rhea)
NADH dehydrogenase (ubiquinone) activity
a ubiquinone + NADH + 5 H(+)(in) = a ubiquinol + NAD(+) + 4 H(+)(out) (7.1.1.2)
RHEA 29091:
Summaries
Gene Group (FlyBase)
MITOCHONDRIAL COMPLEX I - CORE SUBUNITS -
Mitochondrial Complex I is the first and largest holoenzyme of the mitochondrial electron transport chain. It oxidizes NADH from the tricarboxylic acid cycle and β oxidation of fatty acids, reduces ubiquinone and transports protons across the inner membrane, contributing to the proton-motive force. It is also involved in the cellular production of reactive oxygen species. Fourteen distinct subunits form the catalytic centers of the enzyme as they are directly involved in transferring electrons from NADH to ubiquinone, or for generation of the membrane potential - they are referred to as the 'core' or 'central' subunits and are conserved from the ancestral enzyme in bacteria to mammals. Seven core subunits are encoded by mtDNA, while the others are encoded the nuclear genome. (Adapted from PMID:23527692 and FBrf0244962.)
MITOCHONDRIAL COMPLEX I - TESTIS-SPECIFIC VARIANT -
Mitochondrial Complex I is the first and largest holoenzyme of the mitochondrial electron transport chain. It oxidizes NADH from the tricarboxylic acid cycle and β oxidation of fatty acids, reduces ubiquinone and transports protons across the inner membrane, contributing to the proton-motive force. It is also involved in the cellular production of reactive oxygen species. Fourteen distinct subunits form the catalytic centers of the enzyme as they are directly involved in transferring electrons from NADH to ubiquinone, or for generation of the membrane potential. (Adapted from PMID:23527692 and FBrf0244962.)
MITOCHONDRIAL COMPLEX I -
Mitochondrial Complex I is the first and largest holoenzyme of the mitochondrial electron transport chain. It oxidizes NADH from the tricarboxylic acid cycle and β oxidation of fatty acids, reduces ubiquinone and transports protons across the inner membrane, contributing to the proton-motive force. It is also involved in the cellular production of reactive oxygen species. Fourteen distinct subunits form the catalytic centers of the enzyme as they are directly involved in transferring electrons from NADH to ubiquinone, or for generation of the membrane potential. (Adapted from PMID:23527692 and FBrf0244962.)
Pathway (FlyBase)
OXIDATIVE PHOSPHORYLATION -
Oxidative phosphorylation (OXPHOS) is the coordinated transfer of electrons and protons leading to the production of ATP. The OXPHOS system is composed of five mitochondrial inner membrane complexes, Complexes I-IV comprise the electron respiratory chain and Complex V the ATP synthase. Complexes I and II oxidize the electron donors NADH and FADH2, respectively, derived from the tricarboxylic acid (TCA) cycle, and the electrons are transferred to the electron carrier ubiquinone which shuttles them to Complex III. Cytochrome c transfers electrons between Complex III and the terminal complex in the respiratory chain, Complex IV. Complex IV catalyzes electron transfer from reduced cytochrome c to oxygen. Complex I, II and IV couple electron transfer to proton transport across the inner mitochondrial membrane into the inner membrane space. This generates a proton electrochemical gradient which is used to drive the synthesis of ATP from ADP and inorganic phosphate by ATP synthase (Complex V). (Adapted from PMID:23356252 and PMID:11331900.)
Protein Function (UniProtKB)
Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) that is believed to belong to the minimal assembly required for catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone (By similarity).
(UniProt, P03896)
Gene Model and Products
Number of Transcripts
1
Number of Unique Polypeptides
1

Please see the JBrowse view of Dmel\mt:ND2 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 P03896)

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
PDB - An information portal to biological macromolecular structures
Comments on Gene Model
Transcript Data
Annotated Transcripts
Name
FlyBase ID
RefSeq ID
Length (nt)
Assoc. CDS (aa)
FBtr0100857
1024
341
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
FBpp0100175
39.8
341
9.55
Polypeptides with Identical Sequences

There is only one protein coding transcript and one polypeptide associated with this gene

Additional Polypeptide Data and Comments
Reported size (kDa)
Comments
External Data
Crossreferences
PDB - An information portal to biological macromolecular structures
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\mt:ND2 using the Feature Mapper tool.

External Data
Crossreferences
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).

NA

Transcript Expression
Additional Descriptive Data
Marker for
 
Subcellular Localization
CV Term
Polypeptide Expression
mass spectroscopy
Stage
Tissue/Position (including subcellular localization)
Reference
Additional Descriptive Data
Marker for
 
Subcellular Localization
CV Term
Evidence
References
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\mt:ND2 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
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
Images
Alleles, Insertions, Transgenic Constructs, and Aberrations
Classical and Insertion Alleles ( 2 )
For All Classical and Insertion Alleles Show
 
Other relevant insertions
Transgenic Constructs ( 2 )
For All Alleles Carried on Transgenic Constructs Show
Transgenic constructs containing/affecting coding region of mt:ND2
Transgenic constructs containing regulatory region of mt:ND2
Aberrations (Deficiencies and Duplications) ( 0 )
Inferred from experimentation ( 0 )
Inferred from location ( 0 )
    Variants
    Variant Molecular Consequences
    Alleles Representing Disease-Implicated Variants
    Phenotypes
    For more details about a specific phenotype click on the relevant allele symbol.
    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)
    13 of 14
    Yes
    Yes
    2 of 14
    No
    No
    1 of 14
    No
    No
    Model Organism Orthologs (via DIOPT v9.1)
    Species\Gene Symbol
    Score
    Best Score
    Best Reverse Score
    Alignment
    Complementation?
    Transgene?
    Rattus norvegicus (Norway rat) (3)
    13 of 14
    Yes
    Yes
    2 of 14
    No
    No
    1 of 14
    No
    No
    Mus musculus (laboratory mouse) (3)
    12 of 14
    Yes
    Yes
    2 of 14
    No
    No
    1 of 14
    No
    No
    Xenopus tropicalis (Western clawed frog) (2)
    10 of 13
    Yes
    Yes
    1 of 13
    No
    No
    Danio rerio (Zebrafish) (3)
    13 of 14
    Yes
    Yes
    2 of 14
    No
    No
    1 of 14
    No
    No
    Caenorhabditis elegans (Nematode, roundworm) (2)
    4 of 14
    Yes
    Yes
    1 of 14
    No
    No
    Anopheles gambiae (African malaria mosquito) (3)
    10 of 12
    Yes
    Yes
    1 of 12
    No
    No
    Arabidopsis thaliana (thale-cress) (4)
    8 of 13
    Yes
    Yes
    5 of 13
    No
    Yes
    1 of 13
    No
    No
    1 of 13
    No
    No
    Saccharomyces cerevisiae (Brewer's yeast) (0)
    Schizosaccharomyces pombe (Fission yeast) (0)
    Escherichia coli (enterobacterium) (7)
    9 of 11
    Yes
    Yes
    3 of 11
    No
    Yes
    1 of 11
    No
    Yes
    1 of 11
    No
    Yes
    1 of 11
    No
    Yes
    1 of 11
    No
    No
    1 of 11
    No
    No
    Other Organism Orthologs (via OrthoDB)
    Data provided directly from OrthoDB:mt:ND2. 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 ( 0 )
    Human Ortholog
    Disease
    Evidence
    References
    Modifiers Based on Experimental Evidence ( 0 )
    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.
    Homo sapiens (Human)
    Gene name
    Score
    OMIM
    OMIM Phenotype
    DO term
    Complementation?
    Transgene?
    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.
    Interactions
    Summary of Physical Interactions
    Interaction Browsers

    Please see the Physical Interaction reports below for full details
    RNA-protein
    Physical Interaction
    Assay
    References
    protein-protein
    Physical Interaction
    Assay
    References
    Summary of Genetic Interactions
    Interaction Browsers
    Starting gene(s)
    Interaction type
    Interacting gene(s)
    Reference
    Starting gene(s)
    Interaction type
    Interacting gene(s)
    Reference
    External Data
    Linkouts
    Pathways
    Signaling Pathways (FlyBase)
    Metabolic Pathways
    External Links
    FlyCyc Pathways - Pathways from a BioCyc PGDB for Dmel
    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)
    mitochondrion_genome
    Recombination map
    Cytogenetic map
    Sequence location
    FlyBase Computed Cytological Location
    Cytogenetic map
    Evidence for location
    Experimentally Determined Cytological Location
    Cytogenetic map
    Notes
    References
    Experimentally Determined Recombination Data
    Location
    Left of (cM)
    Right of (cM)
    Notes
    Stocks and Reagents
    Stocks (3)
    Genomic Clones (0)
     
      cDNA Clones (0)
       

      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
              Other clones
                RNAi and Array Information
                Linkouts
                DRSC - Results frm RNAi screens
                Antibody Information
                Laboratory Generated Antibodies
                 
                Commercially Available Antibodies
                 
                Cell Line Information
                Publicly Available Cell Lines
                 
                  Other Stable Cell Lines
                   
                    Other Comments

                    New annotation (CG34063) in release 4.3 of the genome annotation.

                    mt:ND2 has been cloned and sequenced, and compared to Dsim\mt:ND2, Dsec\mt:ND2 and Dmau\mt:ND2.

                    During oogenesis RNA from mt:srRNA, mt:lrRNA, mt:ND2, mt:CoI, mt:CoII, mt:CoIII, mt:ND4, mt:ND5 and mt:Cyt-b shows fluctuations in RNA density after stage 9 in follicle and nurse cells.There is a correlation between the mtRNA level and the cell volume and/or the nuclear DNA content suggesting a global extra-mitochondrial, transcriptional control mechanism.

                    Relationship to Other Genes
                    Source for database merge of
                    Additional comments
                    Nomenclature History
                    Source for database identify of
                    Nomenclature comments
                    Etymology
                    Synonyms and Secondary IDs (12)
                    Reported As
                    Symbol Synonym
                    Name Synonyms
                    Mitochondrial NADH-ubiquinone
                    NADH dehydrogenase subunit 2
                    mitochondrial NADH-ubiquinone oxidoreductase chain 2
                    oxidoreductase chain 2
                    Secondary FlyBase IDs
                    • FBgn0002867
                    Datasets (0)
                    Study focus (0)
                    Experimental Role
                    Project
                    Project Type
                    Title
                    Study result (0)
                    Result
                    Result Type
                    Title
                    External Crossreferences and Linkouts ( 45 )
                    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
                    UniProt/TrEMBL - Automatically annotated and unreviewed 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.
                    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)
                    PDB - An information portal to biological macromolecular structures
                    Linkouts
                    DRSC - Results frm RNAi screens
                    FlyCyc Genes - Genes from a BioCyc PGDB for Dmel
                    FlyCyc Pathways - Pathways from a BioCyc PGDB for Dmel
                    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.
                    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 (130)