A0A097IWC5 · A0A097IWC5_9ADEN
- ProteinPre-protein VI
- GeneL3
- StatusUniProtKB unreviewed (TrEMBL)
- Organism
- Amino acids234 (go to sequence)
- Protein existenceEvidence at transcript level
- Annotation score4/5
Function
function
Endosome lysis protein: Structural component of the virion that provides increased stability to the particle shell through its interaction with the core-capsid bridging protein and the hexon-linking protein VIII. Fibers shedding during virus entry into host cell allows the endosome lysis protein to be exposed as a membrane-lytic peptide. Exhibits pH-independent membrane fragmentation activity and probably mediates viral rapid escape from host endosome via organellar membrane lysis. It is not clear if it then remains partially associated with the capsid and involved in the intracellular microtubule-dependent transport of capsid to the nucleus, or if it is lost during endosomal penetration.
Pre-protein VI: During virus assembly, promotes hexon trimers nuclear import through nuclear pore complexes via an importin alpha/beta-dependent mechanism. By analogy to herpesviruses capsid assembly, might act as a chaperone to promote the formation of the icosahedral capsid.
Protease cofactor: Cofactor that activates the viral protease. Binds to viral protease in a 1:1 ratio.
Miscellaneous
All late proteins expressed from the major late promoter are produced by alternative splicing and alternative polyadenylation of the same gene giving rise to non-overlapping ORFs. A leader sequence is present in the N-terminus of all these mRNAs and is recognized by the viral shutoff protein to provide expression although conventional translation via ribosome scanning from the cap has been shut off in the host cell.
Features
Showing features for site.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Site | 33-34 | Cleavage; by viral protease | ||||
Sequence: GA | ||||||
Site | 222-223 | Cleavage; by viral protease | ||||
Sequence: LG |
GO annotations
Aspect | Term | |
---|---|---|
Cellular Component | host cell | |
Cellular Component | host cell cytoplasm | |
Cellular Component | host cell nucleus | |
Cellular Component | viral capsid | |
Cellular Component | viral procapsid | |
Biological Process | lysis of host organelle involved in viral entry into host cell | |
Biological Process | microtubule-dependent intracellular transport of viral material towards nucleus | |
Biological Process | viral release from host cell |
Keywords
- Biological process
Names & Taxonomy
Protein names
- Recommended namePre-protein VI
- Short namespVI
- Cleaved into 2 chains
Gene names
Organism names
- Organism
- Strain
- Taxonomic lineageViruses > Varidnaviria > Bamfordvirae > Preplasmiviricota > Tectiliviricetes > Rowavirales > Adenoviridae > Mastadenovirus > Simian mastadenovirus H > simian adenovirus 54
Accessions
- Primary accessionA0A097IWC5
Proteomes
Subcellular Location
UniProt Annotation
GO Annotation
Pre-protein VI
Note: Shuttles between host cytoplasm and nucleus.
Endosome lysis protein
Note: Associates with the base of each peripentonal hexon on the capsid interior. Present in around 360 copies per virion.
Keywords
- Cellular component
PTM/Processing
Features
Showing features for propeptide, chain, modified residue, disulfide bond.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Propeptide | PRO_5011800735 | 1-33 | ||||
Sequence: MEDVNFSSLAPRHGTRPYLGTWNDIGTSQLNGG | ||||||
Chain | PRO_5023286567 | 1-234 | Pre-protein VI | |||
Sequence: MEDVNFSSLAPRHGTRPYLGTWNDIGTSQLNGGAFNWSSIWSGLKNFGSAVKTYGNRAWNSSTGQLLRDKLKEQNFQQKVVDGLAAGINGVVDIANQAVQREINNRLDPRPVEEKLPELEKEPQGEKRPRPDLEETLVTKTEEPPSYEEAVKNVPSVSLKPVTYPLTKPILSMATPVGDVPVTSVPIAPPVSRPAIRPVAVATPRYSRSNNWQSTLNSIVGLGVKTLKRRRCYY | ||||||
Modified residue | 139 | Phosphothreonine; by host | ||||
Sequence: T | ||||||
Chain | PRO_5023286569 | 223-233 | Protease cofactor | |||
Sequence: GVKTLKRRRCY | ||||||
Disulfide bond | 232 | Interchain (with Adenovirus protease) | ||||
Sequence: C |
Post-translational modification
Protease cofactor: Contains the major nuclear import and export signals. Proteolytically removed during virion maturation. The processing of the C-terminus turns the precursor into a mature viral structural protein and abrogates its ability to promote hexon import and act as a potential chaperone protein.
Ubiquitinated by Nedd4 following partial capsid disassembly; which might play a role in intracellular virus movement during entry.
Keywords
- PTM
Expression
Induction
Expressed in the late phase of the viral replicative cycle.
Keywords
- Developmental stage
Interaction
Subunit
Endosome lysis protein
Interacts (via PPxY motif) with host NEDD4 ubiquitine ligase; this interaction might play a role in virus intracellular transport during entry. Part of a complex composed of the core-capsid bridging protein, the endosome lysis protein VI and the hexon-linking protein VIII; these interactions bridge the virus core to the capsid. Interacts with peripentonal hexons; this interaction stabilizes the capsid by gluing two peripentonal hexons together and joining them with an adjacent group-of-nine hexon.
Pre-protein VI
Interacts with hexon protein; this interaction allows nuclear import of hexon trimers and possibly pre-capsid assembly. Interacts (via C-terminal NLS) with importin alpha/beta.
Protease cofactor
Heterodimer with the viral protease; disulfide-linked. Interacts with the viral protease.
Structure
Family & Domains
Features
Showing features for region, motif, compositional bias.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Region | 34-54 | Amphipathic alpha-helix essential for membrane lytic activity | ||||
Sequence: AFNWSSIWSGLKNFGSAVKTY | ||||||
Region | 36-53 | Involved in endosomal membrane lysis | ||||
Sequence: NWSSIWSGLKNFGSAVKT | ||||||
Region | 48-74 | Interaction with hexon protein | ||||
Sequence: GSAVKTYGNRAWNSSTGQLLRDKLKEQ | ||||||
Motif | 67-76 | Nuclear export signal | ||||
Sequence: LRDKLKEQNF | ||||||
Region | 105-145 | Disordered | ||||
Sequence: NRLDPRPVEEKLPELEKEPQGEKRPRPDLEETLVTKTEEPP | ||||||
Compositional bias | 106-145 | Basic and acidic residues | ||||
Sequence: RLDPRPVEEKLPELEKEPQGEKRPRPDLEETLVTKTEEPP | ||||||
Motif | 144-147 | PPXY motif | ||||
Sequence: PPSY | ||||||
Motif | 214-225 | Nuclear export signal | ||||
Sequence: STLNSIVGLGVK | ||||||
Region | 216-222 | Interaction with hexon protein | ||||
Sequence: LNSIVGL | ||||||
Region | 223-233 | Binds to importin alpha/beta, involved in hexon nuclear import | ||||
Sequence: GVKTLKRRRCY | ||||||
Motif | 228-231 | Nuclear localization signal | ||||
Sequence: KRRR |
Domain
Late-budding domains (L domains) are short sequence motifs essential for viral particle release. They can occur individually or in close proximity within structural proteins. They interacts with sorting cellular proteins of the multivesicular body (MVB) pathway. Most of these proteins are class E vacuolar protein sorting factors belonging to ESCRT-I, ESCRT-II or ESCRT-III complexes. Minor capsid protein 6 contains one L domain: a PPXY motif which binds to the WW domains of HECT (homologous to E6-AP C-terminus) E3 ubiquitin ligases, like NEDD4. In adenoviruses, this motif seems to play a role in microtubule-dependent intracellular trafficking toward the nucleus during virus entry into host cell and in suppression of DAXX-mediated repression of the immediate early E1A promoter.
N-terminal amphipathic alpha-helix domain is essential for the membrane lytic activity.
Sequence similarities
Belongs to the adenoviridae protein VI family.
Phylogenomic databases
Family and domain databases
Sequence
- Sequence statusComplete
- Length234
- Mass (Da)25,877
- Last updated2015-01-07 v1
- Checksum061AF2626982F6A6
Computationally mapped potential isoform sequences
There are 2 potential isoforms mapped to this entry
Entry | Entry name | Gene name | Length | ||
---|---|---|---|---|---|
A0A097IWC4 | A0A097IWC4_9ADEN | L3 | 936 | ||
A0A097IWB8 | A0A097IWB8_9ADEN | L3 | 204 |
Features
Showing features for compositional bias.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Compositional bias | 106-145 | Basic and acidic residues | ||||
Sequence: RLDPRPVEEKLPELEKEPQGEKRPRPDLEETLVTKTEEPP |
Keywords
- Technical term
Sequence databases
Nucleotide Sequence | Protein Sequence | Molecule Type | Status | |
---|---|---|---|---|
KM190146 EMBL· GenBank· DDBJ | AIT70981.1 EMBL· GenBank· DDBJ | Genomic DNA |