B6UR69 · B6UR69_9REOV
- ProteinRNA-directed RNA polymerase
- StatusUniProtKB unreviewed (TrEMBL)
- Organism
- Amino acids120 (go to sequence)
- Protein existenceInferred from homology
- Annotation score2/5
Function
function
RNA-directed RNA polymerase that is involved in both transcription and genome replication. Together with VP3 capping enzyme, forms an enzyme 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 extruded through the DLP's channels into the cytoplasm where they function as mRNAs for translation of viral proteins. One copy of each of the viral +RNAs is also recruited during core assembly, together with newly synthesized polymerase complexes and VP2. The polymerase of these novo-formed particles catalyzes the synthesis of complementary minus-strands leading to dsRNA formation. To do so, the polymerase specifically recognizes and binds 4 bases 5'-UGUG-3' in the conserved 3'-sequence of plus-strand RNA templates. VP2 presumably activates the autoinhibited VP1-RNA complex to coordinate packaging and genome replication. Once dsRNA synthesis is complete, the polymerase switches to the transcriptional mode, thus providing secondary transcription.
Catalytic activity
- a ribonucleoside 5'-triphosphate + RNA(n) = diphosphate + RNA(n+1)
Cofactor
GO annotations
Aspect | Term | |
---|---|---|
Cellular Component | virion component | |
Molecular Function | nucleotide binding | |
Molecular Function | RNA binding | |
Molecular Function | RNA-dependent RNA polymerase activity |
Keywords
- Molecular function
- Biological process
- Ligand
Enzyme and pathway databases
Names & Taxonomy
Protein names
- Recommended nameRNA-directed RNA polymerase
- EC number
- Alternative names
Organism names
- Organism
- Strain
- Taxonomic lineageViruses > Riboviria > Orthornavirae > Duplornaviricota > Resentoviricetes > Reovirales > Sedoreoviridae > Rotavirus > Rotavirus A
Accessions
- Primary accessionB6UR69
Subcellular Location
UniProt Annotation
GO Annotation
Note: Attached inside the inner capsid as a minor component. Also found in spherical cytoplasmic structures, called virus factories, that appear early after infection and are the site of viral replication and packaging.
Keywords
- Cellular component
Interaction
Subunit
Interacts with VP3 (Potential). Interacts with VP2; this interaction activates VP1. Interacts with NSP5; this interaction is probably necessary for the formation of functional virus factories. Interacts with NSP2; this interaction is weak.
Structure
Family & Domains
Features
Showing features for domain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Domain | 1-120 | Rotavirus VP1 RNA-directed RNA polymerase C-terminal | ||||
Sequence: QRAFMSLSSQKSGIADEIAASSTFKNYVSRLSEQLLFSKNNIVSKGIALTEKAKLNSYAPISLEKRRAQISALLTMLQKPVTFKSSKITINDILRDIKPFFTVSEAHVPIQYQKFMPTLP |
Sequence similarities
Belongs to the reoviridae RNA-directed RNA polymerase family.
Family and domain databases
Sequence
- Sequence statusFragment
- Length120
- Mass (Da)13,453
- Last updated2008-12-16 v1
- ChecksumCF7A8F7968B78F38
Features
Showing features for non-terminal residue.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Non-terminal residue | 1 | |||||
Sequence: Q | ||||||
Non-terminal residue | 120 | |||||
Sequence: P |