FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Gene: Dmel\sun
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General Information
Symbol
Dmel\sun
Species
D. melanogaster
Name
stunted
Annotation Symbol
CG9032
Feature Type
FlyBase ID
FBgn0014391
Gene Model Status
Stock Availability
Gene Summary
Activates the G-protein coupled receptor mth in vitro, leading to increased intracellular calcium ion levels. (UniProt, Q9VXN2)
Contribute a Gene Snapshot for this gene.
Also Known As

ATP synthase epsilon chain

Key Links
Genomic Location
Cytogenetic map
Sequence location
Recombination map
1-52
RefSeq locus
NC_004354 REGION:15847859..15849258
Sequence
Genomic Maps
Other Genome Views
The following external sites may use different assemblies or annotations than FlyBase.
Function
Gene Ontology (GO) Annotations (12 terms)
Molecular Function (3 terms)
Terms Based on Experimental Evidence (2 terms)
CV Term
Evidence
References
inferred from physical interaction with FLYBASE:mth; FB:FBgn0023000
inferred from physical interaction with UniProtKB:O97148
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
Biological Process (6 terms)
Terms Based on Experimental Evidence (3 terms)
CV Term
Evidence
References
inferred from mutant phenotype
inferred from mutant phenotype
Terms Based on Predictions or Assertions (3 terms)
CV Term
Evidence
References
inferred from sequence or structural similarity with SGD:S000006192
inferred from electronic annotation with InterPro:IPR006721, InterPro:IPR036742
inferred from sequence or structural similarity with UniProtKB:P56381
Cellular Component (3 terms)
Terms Based on Experimental Evidence (1 term)
CV Term
Evidence
References
inferred from direct assay
Terms Based on Predictions or Assertions (2 terms)
CV Term
Evidence
References
inferred from biological aspect of ancestor with PANTHER:PTN000278562
non-traceable author statement
inferred from electronic annotation with InterPro:IPR006721
non-traceable author statement
inferred from sequence or structural similarity with UniProtKB:P21306
inferred from electronic annotation with InterPro:IPR036742
inferred from sequence or structural similarity with UniProtKB:P56381
Pathway (FlyBase)
Protein Family (UniProt)
Belongs to the eukaryotic ATPase epsilon family. (Q9VXN2)
Catalytic Activity (EC/Rhea)
proton-transporting ATP synthase activity, rotational mechanism
RHEA 57722:
Summaries
Gene Group (FlyBase)
MITOCHONDRIAL COMPLEX V - CENTRAL STALK -
Mitochondrial ATP synthase (Complex V) synthesizes ATP from ADP and inorganic phosphate using the energy provided by the proton electrochemical gradient across the inner mitochondrial membrane. It consists of two structural domains: the F[[1]] sector, a soluble portion situated in the mitochondrial matrix, and the F[[0]] sector, which spans the inner mitochondrial membrane. The F[[1]] sector is composed of three copies each of subunits alpha and beta, which form the catalytic core that synthesizes ATP, and one each of subunits gamma, delta and epsilon, which constitute the central stalk. (Adapted from PMID:21874297.)
MITOCHONDRIAL COMPLEX V -
Mitochondrial ATP synthase (Complex V) synthesizes ATP from ADP and inorganic phosphate using the energy provided by the proton electrochemical gradient (proton-motive force) across the inner mitochondrial membrane generated by electron transport complexes of the respiratory chain. It is an F-type ATPase and consists of two structural domains: the F1 sector, a soluble portion situated in the mitochondrial matrix, and the F0 sector, which spans the inner mitochondrial membrane. Protons pass from the inter membrane space to the matrix through F0, which transfers the energy created by the proton-motive force to F1 where ADP is phosphorylated to ATP using a rotational mechanism. (Adapted from PMID:23356252 and PMID:21874297).
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)
Activates the G-protein coupled receptor mth in vitro, leading to increased intracellular calcium ion levels.
(UniProt, Q9VXN2)
Summary (Interactive Fly)

a circulating insulinotropic peptide produced by fat cells - modulates physiological insulin levels in response to nutrients ε-subunit of mitochondrial ATP synthase - required for normal spindle orientation during embryonic divisions

Gene Model and Products
Number of Transcripts
2
Number of Unique Polypeptides
2

Please see the JBrowse view of Dmel\sun 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 Q9VXN2)

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

Gene model reviewed during 5.50

Transcript Data
Annotated Transcripts
Name
FlyBase ID
RefSeq ID
Length (nt)
Assoc. CDS (aa)
FBtr0074176
400
61
FBtr0074177
450
57
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
FBpp0073963
6.8
61
11.20
FBpp0073964
6.3
57
11.20
Polypeptides with Identical Sequences

None of the polypeptides share 100% sequence identity.

Additional Polypeptide Data and Comments
Reported size (kDa)
Comments
External Data
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\sun 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).

0.24

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
Expression Deduced from Reporters
High-Throughput Expression Data
Associated Tools

JBrowse - Visual display of RNA-Seq signals

View Dmel\sun 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
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 ( 9 )
For All Classical and Insertion Alleles Show
 
Other relevant insertions
Transgenic Constructs ( 7 )
For All Alleles Carried on Transgenic Constructs Show
Transgenic constructs containing/affecting coding region of sun
Transgenic constructs containing regulatory region of sun
Aberrations (Deficiencies and Duplications) ( 8 )
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
Sterility
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) (2)
10 of 14
Yes
Yes
7 of 14
No
Yes
Model Organism Orthologs (via DIOPT v9.1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
Rattus norvegicus (Norway rat) (2)
10 of 14
Yes
Yes
8 of 14
No
Yes
Mus musculus (laboratory mouse) (1)
9 of 14
Yes
Yes
Xenopus tropicalis (Western clawed frog) (0)
Danio rerio (Zebrafish) (1)
10 of 14
Yes
Yes
Caenorhabditis elegans (Nematode, roundworm) (3)
11 of 14
Yes
Yes
11 of 14
Yes
Yes
11 of 14
Yes
Yes
Anopheles gambiae (African malaria mosquito) (3)
11 of 12
Yes
Yes
11 of 12
Yes
Yes
10 of 12
No
Yes
Arabidopsis thaliana (thale-cress) (1)
10 of 13
Yes
Yes
Saccharomyces cerevisiae (Brewer's yeast) (1)
8 of 13
Yes
Yes
Schizosaccharomyces pombe (Fission yeast) (1)
5 of 12
Yes
Yes
Escherichia coli (enterobacterium) (0)
Other Organism Orthologs (via OrthoDB)
Data provided directly from OrthoDB:sun. Refer to their site for version information.
Paralogs
Paralogs (via DIOPT v9.1)
Drosophila melanogaster (Fruit fly) (1)
12 of 13
Human Disease Associations
FlyBase Human Disease Model Reports
    Disease Ontology (DO) Annotations
    Models Based on Experimental Evidence ( 0 )
    Allele
    Disease
    Evidence
    References
    Potential Models Based on Orthology ( 1 )
    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.
    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
    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
    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)
    X
    Recombination map
    1-52
    Cytogenetic map
    Sequence location
    FlyBase Computed Cytological Location
    Cytogenetic map
    Evidence for location
    13F12-13F12
    Limits computationally determined from genome sequence between P{EP}BEST:RE35685EP1581&P{EP}sdEP1088 and P{EP}Gβ13FEP1071
    Experimentally Determined Cytological Location
    Cytogenetic map
    Notes
    References
    13F-13F
    (determined by in situ hybridisation)
    Experimentally Determined Recombination Data
    Location
    Left of (cM)
    Right of (cM)
    Notes
    Stocks and Reagents
    Stocks (4)
    Genomic Clones (21)
    cDNA Clones (38)
     

    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)
    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

        The maternal effect of the sun mutation leads to abnormalities that are most apparent in the cortical embryonic divisions. First instar larvae that are zygotically mutant for sun grow very slowly and survive for a number of days before dying.

        The sun locus is required for cellularisation and larval growth.

        One of 16 complementation groups identified in a screen for mutations that fail to complement Df(1)sd72b for viability.

        Relationship to Other Genes
        Source for database merge of

        Source for merge of: sun CG9032

        Source for merge of: sun BcDNA:RH48911

        Source for merge of: sun BcDNA:RE19513

        Additional comments

        The CG31477 gene may have been derived from the sun gene by retroposition.

        Source for merge of sun BcDNA:RE19513 was TrEMBL update ( date:020807 ).

        Source for merge of sun BcDNA:RH48911 was TrEMBL update ( date:020807 ).

        Nomenclature History
        Source for database identify of
        Nomenclature comments
        Etymology
        Synonyms and Secondary IDs (16)
        Reported As
        Secondary FlyBase IDs
        • FBgn0014975
        • FBgn0040875
        • FBgn0047007
        • FBgn0047155
        Datasets (0)
        Study focus (0)
        Experimental Role
        Project
        Project Type
        Title
        Study result (0)
        Result
        Result Type
        Title
        External Crossreferences and Linkouts ( 44 )
        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.
        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 (92)