A0A9E7SIV7 · A0A9E7SIV7_9CAUD
- ProteinHolin
- StatusUniProtKB unreviewed (TrEMBL)
- Organism
- Amino acids218 (go to sequence)
- Protein existenceInferred from homology
- Annotation score2/5
Function
function
Accumulates harmlessly in the cytoplasmic membrane until it reaches a critical concentration that triggers the formation of micron-scale pores (holes) causing host cell membrane disruption and endolysin escape into the periplasmic space. Determines the precise timing of host cell lysis. Regulated by specific antiholins that somehow sense superinfections and then delay lysis. Participates with the endolysin and spanin proteins in the sequential events which lead to the programmed host cell lysis releasing the mature viral particles from the host cell.
GO annotations
all annotations | all molecular function | virus receptor activity | dna binding | rna binding | cytoskeletal motor activity | catalytic activity | gtpase activity | structural molecule activity | transporter activity | cytoskeletal protein binding | lipid binding | cyclase activity | antioxidant activity | oxidoreductase activity | transferase activity | hydrolase activity | lyase activity | isomerase activity | ligase activity | protein tag activity | cargo receptor activity | histone binding | protein folding chaperone | translation regulator activity | nutrient reservoir activity | receptor ligand activity | molecular transducer activity | molecular adaptor activity | toxin activity | cell adhesion mediator activity | molecular function regulator activity | virus coreceptor activity | catalytic activity, acting on a protein | catalytic activity, acting on dna | catalytic activity, acting on rna | molecular carrier activity | transcription regulator activity | general transcription initiation factor activity | molecular sensor activity | molecular sequestering activity | atp-dependent activity | other molecular function | all biological process | mitotic cell cycle | cytokinesis | cytoplasmic translation | immune system process | muscle system process | circulatory system process | renal system process | respiratory system process | carbohydrate metabolic process | generation of precursor metabolites and energy | dna replication | dna repair | dna recombination | chromatin organization | dna-templated transcription | regulation of dna-templated transcription | trna metabolic process | protein folding | protein glycosylation | amino acid metabolic process | modified amino acid metabolic process | lipid metabolic process | vitamin metabolic process | sulfur compound metabolic process | intracellular protein transport | nucleocytoplasmic transport | autophagy | inflammatory response | mitochondrion organization | cytoskeleton organization | microtubule-based movement | peroxisome organization | lysosome organization | chromosome segregation | cell adhesion | establishment or maintenance of cell polarity | programmed cell death | photosynthesis | mrna metabolic process | snrna metabolic process | vesicle-mediated transport | reproductive process | digestive system process | signaling | cell differentiation | protein catabolic process | extracellular matrix organization | regulatory ncrna-mediated gene silencing | telomere organization | cell junction organization | wound healing | ribosome biogenesis | cilium organization | anatomical structure development | cell motility | nervous system process | endocrine process | protein maturation | transmembrane transport | nucleobase-containing small molecule metabolic process | hepaticobiliary system process | membrane organization | protein-containing complex assembly | cell wall organization or biogenesis | nitrogen cycle metabolic process | protein localization to plasma membrane | defense response to other organism | detoxification | meiotic nuclear division | mitotic nuclear division | mitochondrial gene expression | carbohydrate derivative metabolic process | other biological process | all cellular component | nuclear chromosome | extracellular region | extracellular space | cell wall | nucleus | nuclear envelope | nucleoplasm | chromosome | nucleolus | mitochondrion | lysosome | endosome | vacuole | peroxisome | endoplasmic reticulum | golgi apparatus | lipid droplet | microtubule organizing center | cytosol | ribosome | cytoskeleton | plasma membrane | cilium | plastid | thylakoid | external encapsulating structure | extracellular matrix | cytoplasmic vesicle | organelle | other cellular component | |||
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Aspect | Term | |
---|---|---|
Cellular Component | host cell plasma membrane | |
Cellular Component | membrane | |
Molecular Function | pore-forming activity | |
Biological Process | viral release from host cell by cytolysis |
Keywords
- Biological process
Names & Taxonomy
Protein names
- Recommended nameHolin
Gene names
Organism names
- Organism
- Taxonomic lineageViruses > Duplodnaviria > Heunggongvirae > Uroviricota > Caudoviricetes > Straboviridae > Tevenvirinae > Tequatrovirus
Accessions
- Primary accessionA0A9E7SIV7
Proteomes
Subcellular Location
UniProt Annotation
GO Annotation
Host cell inner membrane ; Single-pass type II membrane protein
Note: Classified as a class III holin.
Features
Showing features for topological domain, transmembrane.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Topological domain | 1-34 | Cytoplasmic | ||||
Sequence: MAAPRISFSPSDILFGVLDRLFKDNATGKVLASR | ||||||
Transmembrane | 31-49 | Helical | ||||
Sequence: LASRVAVVILLFMMAIVWY | ||||||
Topological domain | 50-218 | Periplasmic | ||||
Sequence: RGDSFFEYYKQSKYETYSEIIEKERNARFESVALEQLQIVHISSEADFSAVYSFRPKNLNYFVDIIAYEGKLPSTISEKSLGGYPVDKTMDEYTVHLNGRHYYSDSKFAFLPTKKPTPEINYMYSCPYFNLDNIYAGTITMYWYRNDHISNDRLESICAQAARILGRAK |
Keywords
- Cellular component
PTM/Processing
Features
Showing features for disulfide bond.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Disulfide bond | 175↔207 | |||||
Sequence: CPYFNLDNIYAGTITMYWYRNDHISNDRLESIC |
Post-translational modification
Disulfide bond is required for functionality.
Keywords
- PTM
Interaction
Subunit
Homomultimer. Heterotetramer composed of 2 holin and 2 antiholin. The holin-antiholin complex binds dsDNA. Interacts (via C-terminus) with antiholin (via C-terminus); this interaction blocks the holin homomultimerization and delays host cell lysis. Interacts (via N-terminus) with the lysis inhibition accessory protein rIII; this interaction stabilizes the holin-antiholin complex thereby resulting in a robust block of the hole formation.
Structure
Family & Domains
Domain
The C-terminus serves, in association with the antiholin, as a DNA sensor for lysis inhibition under superinfection conditions.
Sequence similarities
Belongs to the T4likevirus holin family.
Keywords
- Domain
Family and domain databases
Sequence
- Sequence statusComplete
- Length218
- Mass (Da)25,208
- Last updated2023-05-03 v1
- Checksum2F5A2AD64240ECF6