FB2025_01 , released February 20, 2025
Gene: Dmel\CSN8
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General Information
Symbol
Dmel\CSN8
Species
D. melanogaster
Name
COP9 signalosome subunit 8
Annotation Symbol
CG42522
Feature Type
FlyBase ID
FBgn0261437
Gene Model Status
Stock Availability
Gene Summary
COP9 signalosome subunit 8 (CSN8) encodes the subunit 8 of the COP9 signalosome (CSN) and is essential for the stability of the complex. The CSN plays a central role in the regulation of E3-cullin RING ubiquitin ligases. [Date last reviewed: 2019-03-07] (FlyBase Gene Snapshot)
Key Links
Genomic Location
Cytogenetic map
Sequence location
Recombination map
2-31
RefSeq locus
NT_033779 REGION:8364855..8365663
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 (0 terms)
Terms Based on Experimental Evidence (0 terms)
Terms Based on Predictions or Assertions (0 terms)
Biological Process (9 terms)
Terms Based on Experimental Evidence (9 terms)
CV Term
Evidence
References
inferred from mutant phenotype
inferred from mutant phenotype
inferred from mutant phenotype
inferred from mutant phenotype
involved_in oogenesis
inferred from mutant phenotype
inferred from mutant phenotype
inferred from mutant phenotype
inferred from mutant phenotype
inferred from mutant phenotype
Terms Based on Predictions or Assertions (2 terms)
CV Term
Evidence
References
inferred from electronic annotation with InterPro:IPR033205
inferred from electronic annotation with InterPro:IPR033205
Cellular Component (1 term)
Terms Based on Experimental Evidence (1 term)
CV Term
Evidence
References
inferred from direct assay
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
inferred from electronic annotation with InterPro:IPR033205
inferred from biological aspect of ancestor with PANTHER:PTN000330924
Protein Family (UniProt)
Belongs to the CSN8 family. (Q7KTH8)
Summaries
Gene Snapshot
COP9 signalosome subunit 8 (CSN8) encodes the subunit 8 of the COP9 signalosome (CSN) and is essential for the stability of the complex. The CSN plays a central role in the regulation of E3-cullin RING ubiquitin ligases. [Date last reviewed: 2019-03-07]
Gene Group (FlyBase)
COP9 SIGNALOSOME -
The COP9 signalosome is an eight-subunit complex that is structurally and evolutionarily related to the 19S lid of the 26S proteasome. The COP9 signalosome plays a central role in the regulation of the E3-cullin RING ubiquitin ligases, deNEDDylating the cullin subunit via the isopeptidase activity of the CNS5 subunit. (Adapted from FBrf0225508 and FBrf0225509).
COP9 SIGNALOSOME COMPLEX - TESTIS-SPECIFIC VARIANT -
The COP9 signalosome is an eight-subunit complex that is structurally and evolutionarily related to the 19S lid of the 26S proteasome. The COP9 signalosome plays a central role in the regulation of the E3-cullin RING ubiquitin ligases, deNEDDylating the cullin subunit via the isopeptidase activity of the CNS5 subunit. (Adapted from FBrf0225508 and FBrf0225509).
Protein Function (UniProtKB)
Probable component of the COP9 signalosome complex (CSN), a complex involved in various cellular and developmental processes. The CSN complex is an essential regulator of the ubiquitin (Ubl) conjugation pathway by mediating the deneddylation of the cullin subunits of the SCF-type E3 ligase complexes, leading to decrease the Ubl ligase activity of SCF. The CSN complex plays an essential role in oogenesis and embryogenesis and is required for proper photoreceptor R cell differentiation and promote lamina glial cell migration or axon targeting. It also promotes Ubl-dependent degradation of cyclin E (CycE) during early oogenesis.
(UniProt, Q7KTH8)
Gene Model and Products
Number of Transcripts
1
Number of Unique Polypeptides
1

Please see the JBrowse view of Dmel\CSN8 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 Q7KTH8)

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 5.50

Transcript Data
Annotated Transcripts
Name
FlyBase ID
RefSeq ID
Length (nt)
Assoc. CDS (aa)
FBtr0079646
641
182
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
FBpp0079262
21.4
182
4.52
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)

Essential component of the CSN complex, probably composed of CSN1b, alien/CSN2, CSN3, CSN4, CSN5, CSN6, CSN7 and CSN8.

(UniProt, Q7KTH8)
Domain

The PCI domain is necessary and sufficient for interactions with other CSN subunits of the complex.

(UniProt, Q7KTH8)
Crossreferences
InterPro - A database of protein families, domains and functional sites
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\CSN8 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).

-0.40

Transcript Expression
Polypeptide Expression
mass spectroscopy
Stage
Tissue/Position (including subcellular localization)
Reference
western blot
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\CSN8 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
Images
Alleles, Insertions, Transgenic Constructs, and Aberrations
Classical and Insertion Alleles ( 5 )
For All Classical and Insertion Alleles Show
 
Other relevant insertions
Transgenic Constructs ( 8 )
For All Alleles Carried on Transgenic Constructs Show
Transgenic constructs containing/affecting coding region of CSN8
Transgenic constructs containing regulatory region of CSN8
Aberrations (Deficiencies and Duplications) ( 0 )
Inferred from experimentation ( 0 )
Inferred from location ( 3 )
Variants
Variant Molecular Consequences
Alleles Representing Disease-Implicated Variants
Phenotypes
Orthologs
Human Orthologs (via DIOPT v9.1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
Homo sapiens (Human) (1)
13 of 14
Yes
Yes
Model Organism Orthologs (via DIOPT v9.1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
Rattus norvegicus (Norway rat) (1)
13 of 14
Yes
Yes
Mus musculus (laboratory mouse) (1)
12 of 14
Yes
Yes
Xenopus tropicalis (Western clawed frog) (1)
11 of 13
Yes
Yes
Danio rerio (Zebrafish) (1)
13 of 14
Yes
Yes
Caenorhabditis elegans (Nematode, roundworm) (0)
Anopheles gambiae (African malaria mosquito) (1)
12 of 12
Yes
Yes
Arabidopsis thaliana (thale-cress) (1)
13 of 13
Yes
Yes
Saccharomyces cerevisiae (Brewer's yeast) (0)
Schizosaccharomyces pombe (Fission yeast) (0)
Escherichia coli (enterobacterium) (0)
Other Organism Orthologs (via OrthoDB)
Data provided directly from OrthoDB:CSN8. 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
    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)
    Other Interaction Browsers

    Please see the Physical Interaction reports below for full details
    protein-protein
    Physical Interaction
    Assay
    References
    Summary of Genetic Interactions
    esyN Network Diagram
    Other Interaction Browsers
    Starting gene(s)
    Interaction type
    Interacting gene(s)
    Reference
    Starting gene(s)
    Interaction type
    Interacting gene(s)
    Reference
    External Data
    Subunit Structure (UniProtKB)
    Essential component of the CSN complex, probably composed of CSN1b, alien/CSN2, CSN3, CSN4, CSN5, CSN6, CSN7 and CSN8.
    (UniProt, Q7KTH8 )
    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
    Class of Gene
    Genomic Location and Detailed Mapping Data
    Chromosome (arm)
    2L
    Recombination map
    2-31
    Cytogenetic map
    Sequence location
    FlyBase Computed Cytological Location
    Cytogenetic map
    Evidence for location
    29B2-29B2
    Limits computationally determined from genome sequence between P{EP}EP646EP646&P{lacW}RpS13k09614 and P{lacW}l(2)k12914k12914&P{lacW}Akap200k07118a
    Experimentally Determined Cytological Location
    Cytogenetic map
    Notes
    References
    29A1-29A2
    Experimentally Determined Recombination Data
    Location
    Left of (cM)
    Right of (cM)
    Notes
    Stocks and Reagents
    Stocks (9)
    Genomic Clones (14)
     

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

    cDNA Clones (4)
     

    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

            3 alleles of l(2)SH1829 recovered in a P-insertion screen.

            Identification: On the basis of sequence similarity to COP9 signalosome units.

            No distinct cDNA has been detected for CSN8, but a sequence putatively encoding CSN8 is found in the 5' untranslated region of the Pp2A-29B gene.

            COP9 signalosome is essential for development.

            Relationship to Other Genes
            Source for database merge of

            Source for merge of: CSN8 l(2)SH1829

            Additional comments

            The symbol "CG13383" has been used erroneously in FlyBase to name 2 adjacent annotations in different releases of the genome annotation. The two annotations represent the CSN8 and Pp2A-29B genes. In release 2 of the genome annotation, the "CG13383" annotation corresponded to the CSN8 open reading frame (ORF), and the annotation corresponding to Pp2A-29B was labelled "CG17291". In release 3.1 of the genome annotation, the "CG13383" annotation corresponded to the Pp2A-29B open reading frame (ORF). In release 3.2 of the genome annotation, the two genes were annotated as part of a dicistronic transcript represented by the "CG33297" annotation. In release 5.1 of the genome annotation, the two genes were annotated as monocistronic transcripts, as there was no longer sufficient evidence to support a processed dicistronic transcript, with the annotation representing the Pp2A-29B gene being labelled "CG17291" and the annotation representing the CSN8 gene being labelled "CG13383". Since the "CG13383" symbol has been used for two different annotations, the annotation for the CSN8 gene has been renamed to "CG42522" in release 5.13 of the genome annotation to avoid confusion.

            RT-PCR analysis of CSN8 and Pp2A-29B transcription provides no evidence that a dicistronic transcript containing both open reading frames is produced. Thus it is concluded that CSN8 is transcribed independently of Pp2A-29B and that a dicistronic transcript is unlikely or is present at undetectable levels.

            CSN8 and Pp2A-29B were annotated as being non-overlapping open reading frames derived from a processed dicistronic transcript in release 3.2 of the genome based on the LD10247 cDNA. However, this clone appears to be problematic and there is no longer sufficient evidence to support a processed dicistronic transcript, thus CSN8 and Pp2A-29B have been annotated as genes encoded by monocistronic transcripts in release 5.1 of the genome annotation.

            Nomenclature History
            Source for database identify of
            Nomenclature comments
            Etymology
            Synonyms and Secondary IDs (15)
            Datasets (0)
            Study focus (0)
            Experimental Role
            Project
            Project Type
            Title
            Study result (0)
            Result
            Result Type
            Title
            External Crossreferences and Linkouts ( 37 )
            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
            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
            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
            FlyMet - A comprehensive tissue-specific metabolomics resource for Drosophila.
            iBeetle-Base - RNAi phenotypes in the red flour beetle (Tribolium castaneum)
            MIST (protein-protein) - An integrated Molecular Interaction Database
            References (57)