B3EUR3 · PA_I61A1

Function

function

Plays an essential role in viral RNA transcription and replication by forming the heterotrimeric polymerase complex together with PB1 and PB2 subunits. The complex transcribes viral mRNAs by using a unique mechanism called cap-snatching. It consists in the hijacking and cleavage of host capped pre-mRNAs. These short capped RNAs are then used as primers for viral mRNAs. The PB2 subunit is responsible for the binding of the 5' cap of cellular pre-mRNAs which are subsequently cleaved after 10-13 nucleotides by the PA subunit that carries the endonuclease activity.

Cofactor

Mn2+ (UniProtKB | Rhea| CHEBI:29035 )

Note: Binds 2 manganese ions per subunit.

Features

Showing features for binding site.

1716100200300400500600700
TypeIDPosition(s)Description
Binding site41Mn2+ 1 (UniProtKB | ChEBI)
Binding site80Mn2+ 2 (UniProtKB | ChEBI)
Binding site108Mn2+ 1 (UniProtKB | ChEBI)
Binding site108Mn2+ 2 (UniProtKB | ChEBI)
Binding site119Mn2+ 1 (UniProtKB | ChEBI)
Binding site120Mn2+ 1 (UniProtKB | ChEBI)

GO annotations

all annotationsall molecular functionvirus receptor activitydna bindingrna bindingcytoskeletal motor activitycatalytic activitygtpase activitystructural molecule activitytransporter activitycytoskeletal protein bindinglipid bindingcyclase activityantioxidant activityoxidoreductase activitytransferase activityhydrolase activitylyase activityisomerase activityligase activityprotein tag activitycargo receptor activityhistone bindingprotein folding chaperonetranslation regulator activitynutrient reservoir activityreceptor ligand activitymolecular transducer activitymolecular adaptor activitytoxin activitycell adhesion mediator activitymolecular function regulator activityvirus coreceptor activitycatalytic activity, acting on a proteincatalytic activity, acting on dnacatalytic activity, acting on rnamolecular carrier activitytranscription regulator activitygeneral transcription initiation factor activitymolecular sensor activitymolecular sequestering activityatp-dependent activityother molecular functionall biological processmitotic cell cyclecytokinesiscytoplasmic translationimmune system processmuscle system processcirculatory system processrenal system processrespiratory system processcarbohydrate metabolic processgeneration of precursor metabolites and energydna replicationdna repairdna recombinationchromatin organizationdna-templated transcriptionregulation of dna-templated transcriptiontrna metabolic processprotein foldingprotein glycosylationamino acid metabolic processmodified amino acid metabolic processlipid metabolic processvitamin metabolic processsulfur compound metabolic processintracellular protein transportnucleocytoplasmic transportautophagyinflammatory responsemitochondrion organizationcytoskeleton organizationmicrotubule-based movementperoxisome organizationlysosome organizationchromosome segregationcell adhesionestablishment or maintenance of cell polarityprogrammed cell deathphotosynthesismrna metabolic processsnrna metabolic processvesicle-mediated transportreproductive processdigestive system processsignalingcell differentiationprotein catabolic processextracellular matrix organizationregulatory ncrna-mediated gene silencingtelomere organizationcell junction organizationwound healingribosome biogenesiscilium organizationanatomical structure developmentcell motilitynervous system processendocrine processprotein maturationtransmembrane transportnucleobase-containing small molecule metabolic processhepaticobiliary system processmembrane organizationprotein-containing complex assemblycell wall organization or biogenesisnitrogen cycle metabolic processprotein localization to plasma membranedefense response to other organismdetoxificationmeiotic nuclear divisionmitotic nuclear divisionmitochondrial gene expressioncarbohydrate derivative metabolic processother biological processall cellular componentnuclear chromosomeextracellular regionextracellular spacecell wallnucleusnuclear envelopenucleoplasmchromosomenucleolusmitochondrionlysosomeendosomevacuoleperoxisomeendoplasmic reticulumgolgi apparatuslipid dropletmicrotubule organizing centercytosolribosomecytoskeletonplasma membraneciliumplastidthylakoidexternal encapsulating structureextracellular matrixcytoplasmic vesicleorganelleother cellular component
Cell color indicative of number of GO terms
AspectTerm
Cellular Componenthost cell cytoplasm
Cellular Componenthost cell nucleus
Molecular Functionendonuclease activity
Molecular Functionmetal ion binding
Molecular FunctionRNA binding
Biological Processcap snatching
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 translational frameshifting

Keywords

Enzyme and pathway databases

Protein family/group databases

Names & Taxonomy

Protein names

  • Recommended name
    Polymerase acidic protein
  • EC number
  • Alternative names
    • RNA-directed RNA polymerase subunit P2

Gene names

    • Name
      PA

Organism names

Accessions

  • Primary accession
    B3EUR3

Proteomes

Subcellular Location

Host cytoplasm
Host nucleus
Note: PB1 and PA are transported in the host nucleus as a complex.

Keywords

PTM/Processing

Features

Showing features for chain.

TypeIDPosition(s)Description
ChainPRO_00003730031-716Polymerase acidic protein

Post-translational modification

Phosphorylated on serines and threonines by host kinases, including human casein kinase II.

Keywords

Interaction

Subunit

Influenza RNA polymerase is composed of three subunits: PB1, PB2 and PA. Interacts (via C-terminus) with PB1 (via N-terminus).

Structure

3D structure databases

Family & Domains

Features

Showing features for motif.

TypeIDPosition(s)Description
Motif124-139Nuclear localization signal 1 (NLS1)
Motif184-247Nuclear localization signal 2 (NLS2)

Sequence similarities

Belongs to the influenza viruses PA family.

Family and domain databases

Sequence & Isoform

Align isoforms (2)
  • Sequence status
    Complete

This entry describes 2 isoforms produced by Ribosomal frameshifting.

B3EUR3-1

This isoform has been chosen as the canonical sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry.

  • Length
    716
  • Mass (Da)
    82,736
  • Last updated
    2008-07-22 v1
  • Checksum
    BC4FCAA631FBD620
MEDFVRQCFNPMIVELAEKTMKEYGENPKIETNKFAAICTHMEVCFMYSDFHFINERGESIIVEPGDSNALLKHRFEIIEGRDRNVAWTVVNSICNTTGVGKPKFLPDLYDYKEDRFIEIGVTRREVHVYYLEKANKIKSEETHIHIFSFTGEEMATKADYTLDEESRARIKTRLFTIRQEMASRGLWDSFRQSERGEETIEERFEITGTMRRLADQSLPPNFSSLENFRAYVDGFEPNGYIEGKLSQMSREVNARIEPFLKTTPRPLRLPCGPPCFQRSKFLLMDALKLNIEDPSHEGEGIPLYDAVRCMKTFFGWKEPTIVKPHEKGINSNYLLAWKQVLAEIQDIEDEKKIPRIKNMKKTSPLKWALGENMAPEKVDFDDCKDVSDLKQYDSDEPEFRSLASWIQNEFNKACELTDSSWLELDEIGEDVAPIEHIASMRRNYFTAEVSHCRATEYIMKGVYINTALLNASCAAMDDFQLIPMISKCRTKEGRRKTNLYGFIIKGRSHLRNDTDVVNFVSMEFSLTDPRLEPHKWEKYCILEIGDMVLRTAIGQVARPMFLYVRTNGTSKIKMKWGMEMRRCLLQSLQQIESMIEAESSVKEKDMTKEFFENKSETWPIGESPKGVEEGSIGKVCRTLLAKSVFNCLYASPQLEGFSAESRKLLLIVQALRDNLEPGTFDLGGLYESIEECLINDPWVLLNASWFNSFLTHALR

P0DJV2-1

The sequence of this isoform can be found in the external entry linked below. Isoforms of the same protein are often annotated in two different entries if their sequences differ significantly.

View isoform
  • Name
    PA-X
  • See also
    sequence in UniParc or sequence clusters in UniRef

Keywords

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
CY032218
EMBL· GenBank· DDBJ
ACD85161.1
EMBL· GenBank· DDBJ
Viral cRNA

Similar Proteins

Disclaimer

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