FB2025_05 , released December 11, 2025
Gene: Dmel\Mon1
Open Close
General Information
Symbol
Dmel\Mon1
Species
D. melanogaster
Name
Monensin sensitivity 1
Annotation Symbol
CG11926
Feature Type
FlyBase ID
FBgn0031640
Gene Model Status
Stock Availability
Gene Summary
Monensin sensitivity 1 (Mon1) encodes a protein that forms a complex with the product of Ccz1 and acts as an exchange factor of the small G-protein encoded by Rab7. It activates and recruits the product of Rab7 to the maturing endosome, inducing the fusion of the matured endosome with the lysosome. Mon1/Ccz1 complex loss of function results in Rab7 phenotypes. [Date last reviewed: 2019-03-14] (FlyBase Gene Snapshot)
Also Known As

Dmon1

Key Links
Genomic Location
Cytogenetic map
Sequence location
Recombination map
2-14
RefSeq locus
NT_033779 REGION:4850641..4852640
Sequence
Genomic Maps
Other Genome Views
The following external sites may use different assemblies or annotations than FlyBase.
Function
Gene Ontology (GO) Annotations (10 terms)
Molecular Function (3 terms)
Terms Based on Experimental Evidence (3 terms)
CV Term
Evidence
References
inferred from direct assay
inferred from physical interaction with UniProtKB:Q9V3I2
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
inferred from biological aspect of ancestor with PANTHER:PTN000315021
inferred from sequence or structural similarity with SGD:S000003092
Biological Process (4 terms)
Terms Based on Experimental Evidence (2 terms)
CV Term
Evidence
References
Terms Based on Predictions or Assertions (3 terms)
CV Term
Evidence
References
Cellular Component (3 terms)
Terms Based on Experimental Evidence (3 terms)
CV Term
Evidence
References
located_in cytosol
inferred from direct assay
inferred from physical interaction with UniProtKB:Q9VRX1, UniProtKB:Q9VZL5
located_in synaptic cleft
inferred from direct assay
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
inferred from sequence or structural similarity with SGD:S000003092
inferred from biological aspect of ancestor with PANTHER:PTN000315023
Gene Group (FlyBase)
Protein Family (UniProt)
Belongs to the MON1/SAND family. (Q9VR38)
Summaries
Gene Snapshot
Monensin sensitivity 1 (Mon1) encodes a protein that forms a complex with the product of Ccz1 and acts as an exchange factor of the small G-protein encoded by Rab7. It activates and recruits the product of Rab7 to the maturing endosome, inducing the fusion of the matured endosome with the lysosome. Mon1/Ccz1 complex loss of function results in Rab7 phenotypes. [Date last reviewed: 2019-03-14]
Gene Group (FlyBase)
MON1-CCZ1 COMPLEX -
As endosomes mature, Rab5 is replaced with Rab7 in a process known as Rab conversion. The Mon1-Ccz1 complex is required for this process. It is recruited to endosomes by the CORVET complex and acts as a guanine nucleotide exchange factor (GEF) for Rab7. (Adapted from PMID:21683469).
Protein Function (UniProtKB)
Part of the Mon1-Ccz1 guanyl-nucleotide exchange factor complex specific for Rab7 that promotes the exchange of GDP to GTP, converting Rab7 from an inactive GDP-bound form into an active GTP-bound form (Probable). Plays an important role in membrane trafficking through the secretory apparatus (By similarity). Required for recruitment of Rab7 to endosomal and autophagosomal membranes to mediate endolysosomal and autolysosomal vesicle maturation (PubMed:23418349, PubMed:27559127, PubMed:37463208). Required for fusion of multivesicular bodies and lysosomes but not their formation or trafficking (PubMed:23418349). Involved in the replacement of Rab5 (and possibly Rab4) with Rab7, also known as Rab conversion or the Rab cascade, during endosomal maturation (PubMed:23418349). The Mon1-Ccz1 complex is recruited to phosphatidylinositol 3-phosphate (PtdIns[3]P) enriched membranes by Rab5, which stimulates recruitment and guanyl-nucleotide exchange of Rab7 (PubMed:32391792). Together with Rab7 required for autolysosome formation in fat cells and autophagic degradation during starvation-induced basal and developmental autophagy (PubMed:27559127). Involved in neuromuscular junction (NMJ) presynaptic bouton function and morphogenesis (PubMed:32658990). Together with Rab7, regulates levels of postsynaptic glutamate receptor GluRIIA in the NMJ presynapse (PubMed:32658990). ACTIVITY REGULATION: The Rab7 guanyl-nucleotide exchange factor (GEF) activity of the Mon1-Ccz1 complex is autoinhibited by the N-terminal disordered region of Mon1 (PubMed:37463208). GEF activity is stimulated by Rab5-mediated recruitment to membranes (PubMed:32391792).
(UniProt, Q9VR38)
Gene Model and Products
Number of Transcripts
1
Number of Unique Polypeptides
1

Please see the JBrowse view of Dmel\Mon1 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 Q9VR38)

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

Gene model reviewed during 5.45

Transcript Data
Annotated Transcripts
Name
FlyBase ID
RefSeq ID
Length (nt)
Assoc. CDS (aa)
FBtr0077387
1882
528
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
FBpp0077079
59.8
528
6.35
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
Subunit Structure (UniProtKB)

Component of the Mon1-Ccz1 guanyl-nucleotide exchange factor complex made up of Mon1, Ccz1 and Bulli; the interaction of Bulli with the Mon1-Ccz1 heterodimer is mediated via the C-terminal Mic1 domain of Bulli (PubMed:27559127, PubMed:32499409, PubMed:37155863, PubMed:37463208). Mon1 and Ccz1 form a stable complex which displays Rab7 GEF activity with or without Bulli; GEF activity is enhanced by Bulli possibly by improving membrane association of the complex (PubMed:32499409, PubMed:37155863). Interacts with Rab5 and Rab7; preferentially binds GTP-bound Rab5 and GDP-bound Rab7 (PubMed:27559127).

(UniProt, Q9VR38)
Domain

The disordered N-terminal is involved in autoinhibition of the Mon1-Ccz1 complex guanyl-nucleotide exchange factor activity.

(UniProt, Q9VR38)
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\Mon1 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).

2.06

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
located_in cytosol
inferred from direct assay
inferred from physical interaction with UniProtKB:Q9VRX1, UniProtKB:Q9VZL5
located_in synaptic cleft
inferred from direct assay
Expression Deduced from Reporters
High-Throughput Expression Data
Associated Tools

JBrowse - Visual display of RNA-Seq signals

View Dmel\Mon1 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 ( 7 )
For All Classical and Insertion Alleles Show
 
Other relevant insertions
Transgenic Constructs ( 10 )
For All Alleles Carried on Transgenic Constructs Show
Transgenic constructs containing/affecting coding region of Mon1
Transgenic constructs containing regulatory region of Mon1
Aberrations (Deficiencies and Duplications) ( 4 )
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) (2)
14 of 14
Yes
Yes
13 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)
14 of 14
Yes
Yes
10 of 14
No
Yes
Mus musculus (laboratory mouse) (2)
14 of 14
Yes
Yes
12 of 14
No
Yes
Xenopus tropicalis (Western clawed frog) (2)
11 of 13
Yes
Yes
5 of 13
No
Yes
Danio rerio (Zebrafish) (3)
14 of 14
Yes
Yes
13 of 14
No
Yes
9 of 14
No
Yes
Caenorhabditis elegans (Nematode, roundworm) (1)
14 of 14
Yes
Yes
Anopheles gambiae (African malaria mosquito) (1)
12 of 12
Yes
Yes
Arabidopsis thaliana (thale-cress) (1)
12 of 13
Yes
Yes
Saccharomyces cerevisiae (Brewer's yeast) (1)
13 of 13
Yes
Yes
Schizosaccharomyces pombe (Fission yeast) (1)
11 of 12
Yes
Yes
Escherichia coli (enterobacterium) (0)
Other Organism Orthologs (via OrthoDB)
Data provided directly from OrthoDB:Mon1. 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 ( 0 )
    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
    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
    Subunit Structure (UniProtKB)
    Component of the Mon1-Ccz1 guanyl-nucleotide exchange factor complex made up of Mon1, Ccz1 and Bulli; the interaction of Bulli with the Mon1-Ccz1 heterodimer is mediated via the C-terminal Mic1 domain of Bulli (PubMed:27559127, PubMed:32499409, PubMed:37155863, PubMed:37463208). Mon1 and Ccz1 form a stable complex which displays Rab7 GEF activity with or without Bulli; GEF activity is enhanced by Bulli possibly by improving membrane association of the complex (PubMed:32499409, PubMed:37155863). Interacts with Rab5 and Rab7; preferentially binds GTP-bound Rab5 and GDP-bound Rab7 (PubMed:27559127).
    (UniProt, Q9VR38 )
    Linkouts
    DroID - A comprehensive database of gene and protein interactions.
    MIST (protein-protein) - An integrated Molecular Interaction Database
    Pathways
    Signaling Pathways (FlyBase)
    Metabolic Pathways
    FlyBase
    External Links
    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)
    2L
    Recombination map
    2-14
    Cytogenetic map
    Sequence location
    FlyBase Computed Cytological Location
    Cytogenetic map
    Evidence for location
    25B1-25B1
    Limits computationally determined from genome sequence between P{lacW}Tps1k08903&P{EP}morgueEP1184 and P{lacW}l(2)k10004k10004&P{EP}CG3036EP963
    Experimentally Determined Cytological Location
    Cytogenetic map
    Notes
    References
    Experimentally Determined Recombination Data
    Location
    Left of (cM)
    Right of (cM)
    Notes
    Stocks and Reagents
    Stocks (9)
    Genomic Clones (18)
     

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

    cDNA Clones (119)
     

    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
     
    Commercially Available Antibodies
     
    Cell Line Information
    Publicly Available Cell Lines
     
      Other Stable Cell Lines
       
        Other Comments
        Relationship to Other Genes
        Source for database merge of
        Additional comments
        Nomenclature History
        Source for database identify of

        Source for identity of: Mon1 CG11926

        Nomenclature comments
        Etymology
        Synonyms and Secondary IDs (9)
        Datasets (0)
        Study focus (0)
        Experimental Role
        Project
        Project Type
        Title
        Study result (0)
        Result
        Result Type
        Title
        External Crossreferences and Linkouts ( 36 )
        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
        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)
        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.
        References (47)