A0A6B7MY50 · A0A6B7MY50_9INFA

  • Protein
    RNA-directed RNA polymerase catalytic subunit
  • Gene
    PB1
  • Status
    UniProtKB unreviewed (TrEMBL)
  • Amino acids
  • Protein existence
    Inferred from homology
  • Annotation score
    4/5

Function

function

RNA-dependent RNA polymerase which is responsible for replication and transcription of virus RNA segments. The transcription of viral mRNAs occurs by a unique mechanism called cap-snatching. 5' methylated caps of cellular mRNAs are cleaved after 10-13 nucleotides by PA. In turn, these short capped RNAs are used as primers by PB1 for transcription of viral mRNAs. During virus replication, PB1 initiates RNA synthesis and copies vRNA into complementary RNA (cRNA) which in turn serves as a template for the production of more vRNAs.
RNA-dependent RNA polymerase which is responsible for replication and transcription of virus RNA segments. The transcription of viral mRNAs occurs by a unique mechanism called cap-snatching. 5' methylated caps of cellular mRNAs are cleaved after 10-13 nucleotides by PA. In turn, these short capped RNAs are used as primers by PB1 for transcription of viral mRNAs. During virus replication, PB1 initiates RNA synthesis and copy vRNA into complementary RNA (cRNA) which in turn serves as a template for the production of more vRNAs.

Catalytic activity

GO annotations

AspectTerm
Cellular Componentcytoplasm
Cellular Componenthost cell cytoplasm
Cellular Componenthost cell nucleus
Molecular Functionnucleotide binding
Molecular FunctionRNA binding
Molecular FunctionRNA-dependent RNA polymerase activity
Biological ProcessDNA-templated transcription
Biological Processsymbiont-mediated suppression of host mRNA transcription via inhibition of RNA polymerase II activity
Biological Processviral RNA genome replication
Biological Processviral transcription

Keywords

Enzyme and pathway databases

Names & Taxonomy

Protein names

  • Recommended name
    RNA-directed RNA polymerase catalytic subunit
  • EC number
  • Alternative names
    • Polymerase basic protein 1
      (PB1
      )
    • RNA-directed RNA polymerase subunit P1

Gene names

    • Name
      PB1

Organism names

  • Taxonomic identifier
  • Organism
  • Strain
    • A/Wuhan/378/2018
  • Taxonomic lineage
    Viruses > Riboviria > Orthornavirae > Negarnaviricota > Polyploviricotina > Insthoviricetes > Articulavirales > Orthomyxoviridae > Alphainfluenzavirus > Alphainfluenzavirus influenzae

Accessions

  • Primary accession
    A0A6B7MY50

Proteomes

Subcellular Location

Keywords

PTM/Processing

Post-translational modification

Phosphorylated by host PRKCA.

Keywords

Interaction

Subunit

Influenza RNA polymerase is composed of three subunits: PB1, PB2 and PA. Interacts (via N-terminus) with PA (via C-terminus). Interacts (via C-terminus) with PB2 (via N-terminus); this interaction is essential for transcription initiation.

Family & Domains

Features

Showing features for compositional bias, region, motif, domain.

TypeIDPosition(s)Description
Compositional bias50-65Polar residues
Region50-76Disordered
Motif187-195Nuclear localization signal
Motif203-216Nuclear localization signal
Region249-256Promoter-binding site
Domain286-483RdRp catalytic

Sequence similarities

Belongs to the influenza viruses polymerase PB1 family.

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    757
  • Mass (Da)
    86,469
  • Last updated
    2020-06-17 v1
  • Checksum
    84A6F822D139BCA3
MDVNPTLLFLKIPAQNAISTTFPYTGDPPYSHGTGTGYTMDTVNRTHQYSEKGKWTTNTETGAPQLNPIDGPLPEDNEPSGYAQTDCVLEAMAFLEESHPGIFENSCLETMEVVQQTRVDKLTQGRQTYDWTLNRNQPAATALANTIEVFRSNDLTANESGRLIDFLKDVMESMNKEEIEITTHFQRKRRVRDNMTKKMVTQRTIGKKKQRLNKRGYLIRALTLNTMTKDAERGKLKRRAIATPGMQIRGFVYFVETLARSICEKLEQSGLPVGGNEKKARLADVVRKMMTNSQDTEISFTITGDNTKWNENQNPRMFLAMITYITRNQPEWFRNILSMAPIMFSNKMARLGKGYMFESKRMKIRTQIPAEMLASIDLKYFNESTKKKIEKIRPLLMDGTASLSPGMMMGMFNMLSTVLGVSILNLGQKKYTKTIYWWDGLQSSDDFALIVNAPNHEGIQAGVDRFYRTCKLVGINMSKKKSYINRTGTFEFTSFFYRYGFVANFSMELPSFGVSGVNESADMSIGVTVIKNNMINNDLGPATAQMALQLFIKDYRYTYRCHRGDTQIQTRRSFELKKLWDQTQSKVGLLVSDGGPNLYNIRNLHIPEVCLKWELMDDGYRGRLCNPLNPFVSHKEIDSVNNAVVMPAHGPAKSMEYDAVATTHSWIPKRNRSILNTSQRGILEDEQMYQKCCNLFEKFFPSSSYRRPVGISSMVEAMVSRARIDARVDFESGRIKKEEFSEIMKICSTIEELRRQK

Features

Showing features for compositional bias.

TypeIDPosition(s)Description
Compositional bias50-65Polar residues

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
MN594952
EMBL· GenBank· DDBJ
QFR17327.1
EMBL· GenBank· DDBJ
Viral cRNA

Similar Proteins

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