A0A5Q2V3U5 · A0A5Q2V3U5_9REOV
- ProteinProtein VP3
- StatusUniProtKB unreviewed (TrEMBL)
- Organism
- Amino acids693 (go to sequence)
- Protein existenceInferred from homology
- Annotation score3/5
Function
function
Multifunctional enzyme involved in mRNA capping. Catalyzes the formation of the 5' cap structure on the viral plus-strand transcripts. Specifically binds to GTP and displays guanylyltransferase and methyltransferase activities. Has affinity for ssRNA but not for dsRNA. Capping activity is non-specific and caps RNAs that initiate with either a G or an A residue. Together with VP1 polymerase, forms a VP1-VP3 complex positioned near the channels situated at each of the five-fold vertices of the core. Following infection, the outermost layer of the virus is lost, leaving a double-layered particle (DLP) made up of the core and VP6 shell. VP1 then catalyzes the transcription of fully conservative plus-strand genomic RNAs that are capped by VP3 and extruded through the DLP's channels into the cytoplasm where they function as mRNAs for translation of viral proteins. DLPs probably have an RNA triphosphatase activity as well, whereas open cores do not.
Catalytic activity
- a 5'-end (5'-triphosphoguanosine)-ribonucleoside in mRNA + S-adenosyl-L-methionine = a 5'-end (N7-methyl 5'-triphosphoguanosine)-ribonucleoside in mRNA + S-adenosyl-L-homocysteine
GO annotations
Aspect | Term | |
---|---|---|
Cellular Component | viral nucleocapsid | |
Molecular Function | GTP binding | |
Molecular Function | mRNA 5'-cap (guanine-N7-)-methyltransferase activity | |
Molecular Function | mRNA guanylyltransferase activity | |
Molecular Function | RNA binding | |
Biological Process | virus-mediated perturbation of host defense response |
Keywords
- Molecular function
- Biological process
- Ligand
Names & Taxonomy
Protein names
- Recommended nameProtein VP3
Including 2 domains:
- Recommended namemRNA guanylyltransferase
- EC number
- Recommended namemRNA (guanine-N(7))-methyltransferase
- EC number
Organism names
- Organism
- Strain
- Taxonomic lineageViruses > Riboviria > Orthornavirae > Duplornaviricota > Resentoviricetes > Reovirales > Sedoreoviridae > Rotavirus
Accessions
- Primary accessionA0A5Q2V3U5
Subcellular Location
UniProt Annotation
GO Annotation
Note: Attached inside the inner capsid as a minor component. There are about 11 to 12 copies per virion.
Keywords
- Cellular component
Interaction
Subunit
Interacts with VP1. Interacts with VP2.
Structure
Family & Domains
Features
Showing features for region.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Region | 433-559 | N7-methyltransferase activity | ||||
Sequence: LMYNAINTIYSDNVFVSGKYTLRGKTEGVVALYYLSNTINPKDKVIQYANSFSGTCMTVRLNNTYEVNKIIDFKTNADYTFLPSDFACSPKTVLTSYRGYAGVFGYAITKDLKSDGNNHIYIIPNAR | ||||||
Region | 560-693 | GTase/RTPase activity | ||||
Sequence: DESNFDTFASHLGLSRYSHSKRFSESATTMSGYLFRDMVSGKEDMEDTDKANCASGHVFNAIAHYRFDYTYDIVGWLRLHKTKHFKVKSDIYEEHTDDEVRNAIEAAYTYYLLDGDKVGKEYAKKIMEIWEAQV |
Sequence similarities
Belongs to the rotavirus VP3 family.
Family and domain databases
Sequence
- Sequence statusComplete
- Length693
- Mass (Da)81,611
- Last updated2020-02-26 v1
- Checksum77FB2E75027A5059