FB2024_02 , released April 23, 2024
Gene: Dmel\porin
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General Information
Symbol
Dmel\porin
Species
D. melanogaster
Name
porin
Annotation Symbol
CG6647
Feature Type
FlyBase ID
FBgn0004363
Gene Model Status
Stock Availability
Gene Summary
porin (porin) encodes a beta-barrel channel protein localized in the outer membrane of mitochondria that conducts translocation of various ions and metabolites between cytoplasm and mitochondria. It plays roles in mitochondria dynamics and mitophagy, and is ubiquitinated by the E3 ligases encoded by park and Mul1. [Date last reviewed: 2019-03-14] (FlyBase Gene Snapshot)
Also Known As

VDAC, VDAC1, l(2)k05123, DmVDAC, POR-1

Key Links
Genomic Location
Cytogenetic map
Sequence location
Recombination map
2-43
RefSeq locus
NT_033779 REGION:10847227..10850848
Sequence
Genomic Maps
Other Genome Views
The following external sites may use different assemblies or annotations than FlyBase.
Function
Gene Ontology (GO) Annotations (13 terms)
Molecular Function (1 term)
Terms Based on Experimental Evidence (1 term)
CV Term
Evidence
References
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
inferred from electronic annotation with InterPro:IPR001925
inferred from biological aspect of ancestor with PANTHER:PTN000201897
Biological Process (9 terms)
Terms Based on Experimental Evidence (8 terms)
CV Term
Evidence
References
inferred from direct assay
inferred from mutant phenotype
inferred from direct assay
inferred from mutant phenotype
involved_in phototransduction
inferred from mutant phenotype
inferred from mutant phenotype
inferred from mutant phenotype
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
Cellular Component (3 terms)
Terms Based on Experimental Evidence (3 terms)
CV Term
Evidence
References
inferred from direct assay
located_in mitochondrion
inferred from high throughput direct assay
inferred from direct assay
located_in Nebenkern
inferred from direct assay
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
inferred from biological aspect of ancestor with PANTHER:PTN000201897
Gene Group (FlyBase)
Protein Family (UniProt)
Belongs to the eukaryotic mitochondrial porin family. (Q94920)
Summaries
Gene Snapshot
porin (porin) encodes a beta-barrel channel protein localized in the outer membrane of mitochondria that conducts translocation of various ions and metabolites between cytoplasm and mitochondria. It plays roles in mitochondria dynamics and mitophagy, and is ubiquitinated by the E3 ligases encoded by park and Mul1. [Date last reviewed: 2019-03-14]
Gene Group (FlyBase)
MITOCHONDRIAL PORINS -
Mitochondrial porins or voltage-dependent anion channels (VDAC) are beta-barrel pores located in the outer mitochondrial membrane. Mitochondrial porins allow the passage of ions and small molecule metabolites and may be regulated by voltage.
Protein Function (UniProtKB)
Forms a channel through the mitochondrial outer membrane and also the plasma membrane (By similarity). The channel at the outer mitochondrial membrane allows diffusion of small hydrophilic molecules; in the plasma membrane it is involved in cell volume regulation and apoptosis (By similarity). It adopts an open conformation at low or zero membrane potential and a closed conformation at potentials above 30-40 mV (By similarity). The open state has a weak anion selectivity whereas the closed state is cation-selective (By similarity). In depolarized mitochondria, acts downstream of park to promote mitophagy or prevent apoptosis; polyubiquitination by park promotes mitophagy, while monoubiquitination by park decreases mitochondrial calcium influx which ultimately inhibits apoptosis (PubMed:32047033).
(UniProt, Q94920)
Summary (Interactive Fly)

main pore-forming protein of the outer mitochondrial membrane - multi-functional channel protein that shuttles metabolites between the mitochondria and the cytosol and implicated in cellular life and death decisions

Gene Model and Products
Number of Transcripts
5
Number of Unique Polypeptides
1

Please see the JBrowse view of Dmel\porin 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 Q94920)

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

Annotated transcripts do not represent all supported alternative splices within 5' UTR.

Gene model reviewed during 5.45

Sequence Ontology: Class of Gene
Transcript Data
Annotated Transcripts
Name
FlyBase ID
RefSeq ID
Length (nt)
Assoc. CDS (aa)
FBtr0080182
1097
282
FBtr0080183
1614
282
FBtr0100584
2625
282
FBtr0305260
1525
282
FBtr0332029
1387
282
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
FBpp0079771
30.5
282
6.97
FBpp0079772
30.5
282
6.97
Polypeptides with Identical Sequences

The group(s) of polypeptides indicated below share identical sequence to each other.

Additional Polypeptide Data and Comments
Reported size (kDa)
Comments
External Data
Subunit Structure (UniProtKB)

Interacts with hexokinases.

(UniProt, Q94920)
Post Translational Modification

Ubiquitinated (PubMed:32047033). Undergoes monoubiquitination and polyubiquitination by park; monoubiquitination at Lys-273 inhibits apoptosis, whereas polyubiquitination at Lys-11, Lys-19, Lys-52 and Lys-109 may promote mitophagy (PubMed:32047033).

(UniProt, Q94920)
Domain

Consists mainly of membrane-spanning sided beta-sheets.

(UniProt, Q94920)
Crossreferences
InterPro - A database of protein families, domains and functional sites
Linkouts
Sequences Consistent with the Gene Model
Nucleotide / Polypeptide Records
 
Mapped Features

Click to get a list of regulatory features (enhancers, TFBS, etc.) and gene disruptions (point mutations, indels, etc.) within or overlapping Dmel\porin 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).

0.20

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

Comment: maternally deposited

RT-PCR
Stage
Tissue/Position (including subcellular localization)
Reference
Additional Descriptive Data

porin transcripts are abundant in both testis and ovary

Three transcript sizes observed on Northern Blot. Sizes were not reported.

Marker for
 
Subcellular Localization
CV Term
Polypeptide Expression
immunolocalization
Stage
Tissue/Position (including subcellular localization)
Reference
mass spectroscopy
Stage
Tissue/Position (including subcellular localization)
Reference
western blot
Stage
Tissue/Position (including subcellular localization)
Reference
Additional Descriptive Data

porin protein is abundant in both testis and ovary. In ovary it is observed in the follicle cells.

Expression of porin is exclusively concentrated in the Nebenkern bodies of spermatids.

Marker for
Subcellular Localization
CV Term
Evidence
References
inferred from direct assay
located_in mitochondrion
inferred from high throughput direct assay
inferred from direct assay
located_in Nebenkern
inferred from direct assay
Expression Deduced from Reporters
High-Throughput Expression Data
Associated Tools

JBrowse - Visual display of RNA-Seq signals

View Dmel\porin 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
FlyExpress - Embryonic expression images (BDGP data)
  • Stages(s) 4-6
  • Stages(s) 7-8
  • Stages(s) 9-10
  • Stages(s) 11-12
  • Stages(s) 13-16
Alleles, Insertions, Transgenic Constructs, and Aberrations
Classical and Insertion Alleles ( 31 )
For All Classical and Insertion Alleles Show
 
Other relevant insertions
Transgenic Constructs ( 16 )
For All Alleles Carried on Transgenic Constructs Show
Transgenic constructs containing/affecting coding region of porin
Transgenic constructs containing regulatory region of porin
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
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) (5)
13 of 14
Yes
Yes
12 of 14
No
Yes
3  
11 of 14
No
Yes
1  
1 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) (5)
13 of 14
Yes
Yes
12 of 14
No
Yes
10 of 14
No
Yes
1 of 14
No
No
1 of 14
No
No
Mus musculus (laboratory mouse) (5)
13 of 14
Yes
Yes
12 of 14
No
Yes
9 of 14
No
Yes
1 of 14
No
No
1 of 14
No
No
Xenopus tropicalis (Western clawed frog) (6)
8 of 13
Yes
Yes
7 of 13
No
Yes
6 of 13
No
Yes
6 of 13
No
Yes
1 of 13
No
No
1 of 13
No
No
Danio rerio (Zebrafish) (6)
13 of 14
Yes
Yes
12 of 14
No
Yes
12 of 14
No
Yes
11 of 14
No
Yes
1 of 14
No
No
1 of 14
No
No
Caenorhabditis elegans (Nematode, roundworm) (2)
14 of 14
Yes
Yes
1 of 14
No
No
Anopheles gambiae (African malaria mosquito) (2)
12 of 12
Yes
Yes
Arabidopsis thaliana (thale-cress) (7)
9 of 13
Yes
Yes
8 of 13
No
Yes
7 of 13
No
Yes
7 of 13
No
Yes
6 of 13
No
Yes
3 of 13
No
Yes
1 of 13
No
No
Saccharomyces cerevisiae (Brewer's yeast) (2)
12 of 13
Yes
Yes
11 of 13
No
Yes
Schizosaccharomyces pombe (Fission yeast) (2)
11 of 12
Yes
Yes
1 of 12
No
No
Escherichia coli (enterobacterium) (0)
Other Organism Orthologs (via OrthoDB)
Data provided directly from OrthoDB:porin. Refer to their site for version information.
Paralogs
Paralogs (via DIOPT v9.1)
Drosophila melanogaster (Fruit fly) (5)
10 of 13
4 of 13
4 of 13
1 of 13
1 of 13
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 ( 3 )
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
esyN Network Diagram
Show neighbor-neighbor interactions:
Show/hide secondary interactors 
(data from AllianceMine provided by esyN)
Select Layout:
Legend:
Protein
RNA
Selected Interactor(s)
Interactions Browser

Please see the Physical Interaction reports below for full details
MIST Molecular Interaction Search Tool

Please see the Physical Interaction reports below for full details
protein-protein
Physical Interaction
Assay
References
Summary of Genetic Interactions
esyN Network Diagram
Show/hide secondary interactors 
(data from AllianceMine provided by esyN)
esyN Network Key:
Suppression
Enhancement

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)
Interacts with hexokinases.
(UniProt, Q94920 )
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
Reactome Metabolic Pathways - An open-source, open access, manually curated and peer-reviewed metabolic pathway database.
External Data
Linkouts
Reactome - An open-source, open access, manually curated and peer-reviewed pathway database.
Genomic Location and Detailed Mapping Data
Chromosome (arm)
2L
Recombination map
2-43
Cytogenetic map
Sequence location
FlyBase Computed Cytological Location
Cytogenetic map
Evidence for location
32B1-32B1
Limits computationally determined from genome sequence between P{PZ}dbf1 and P{lacW}SCARk03107
Experimentally Determined Cytological Location
Cytogenetic map
Notes
References
32B1-32B2
(determined by in situ hybridisation)
32B3-32B4
(determined by in situ hybridisation)
32B-32B
(determined by in situ hybridisation)
79D-79D
(determined by in situ hybridisation)
In situ hybridisation reveals a strong signal at 79D and a weaker signal at 31E.
A cDNA clone also showed hybridization to 31E, but less strongly than at 79B. This may indicate the presence of two porin genes.
Experimentally Determined Recombination Data
Location
Left of (cM)
Right of (cM)
Notes
Stocks and Reagents
Stocks (13)
Genomic Clones (15)
 

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

cDNA Clones (403)
 

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)
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

      porin encodes a voltage-dependent and anion-selective channel.

      porin has been cloned and sequenced. It has been isolated from an expression library using an antibody against tobacco hornworm VDAC protein as a probe. Comparison of DNA sequence with that from FBrf0087605 reveals there is one porin gene, and two isolated cDNAs.

      porin cDNA is isolated and characterised. Present results suggest porin may be a member of a multigene family.

      porin has been characterised and compared to other mitochondrial porins.

      Relationship to Other Genes
      Source for database merge of

      Source for merge of: porin l(2)k05123

      Source for merge of: porin anon-WO02059370.56

      Additional comments

      Source for merge of porin anon-WO02059370.56 was sequence comparison ( date:051113 ).

      Nomenclature History
      Source for database identify of

      Source for identity of: porin CG6647

      Nomenclature comments
      Etymology
      Synonyms and Secondary IDs (21)
      Reported As
      Symbol Synonym
      Vdac
      anon-WO02059370.56
      Secondary FlyBase IDs
      • FBgn0016759
      • FBgn0022189
      • FBgn0024919
      • FBgn0066003
      Datasets (0)
      Study focus (0)
      Experimental Role
      Project
      Project Type
      Title
      Study result (0)
      Result
      Result Type
      Title
      External Crossreferences and Linkouts ( 71 )
      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.
      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
      InterPro - A database of protein families, domains and functional sites
      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
      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 (163)