UniProtKB - P03433 (PA_I34A1)
Protein
Polymerase acidic protein
Gene
PA
Organism
Influenza A virus (strain A/Puerto Rico/8/1934 H1N1)
Status
Functioni
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.UniRule annotation3 Publications
Cofactori
Mn2+UniRule annotation2 PublicationsNote: Binds 2 manganese ions per subunit.UniRule annotation2 Publications
Sites
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Metal bindingi | 41 | Manganese 1; via tele nitrogenUniRule annotationCombined sources2 Publications | 1 | |
Metal bindingi | 80 | Manganese 2UniRule annotationCombined sources1 Publication | 1 | |
Metal bindingi | 108 | Manganese 1UniRule annotationCombined sources1 Publication | 1 | |
Metal bindingi | 108 | Manganese 2UniRule annotationCombined sources1 Publication | 1 | |
Metal bindingi | 119 | Manganese 1UniRule annotationCombined sources1 Publication | 1 | |
Metal bindingi | 120 | Manganese 1; via carbonyl oxygenUniRule annotationCombined sources2 Publications | 1 |
GO - Molecular functioni
- endonuclease activity Source: UniProtKB-KW
- metal ion binding Source: UniProtKB-KW
- RNA binding Source: UniProtKB-UniRule
GO - Biological processi
- cap snatching Source: UniProtKB-UniRule
- fusion of virus membrane with host plasma membrane Source: Reactome
- intracellular transport of virus Source: Reactome
- receptor-mediated endocytosis of virus by host cell Source: Reactome
- suppression by virus of host RNA polymerase II activity Source: UniProtKB-UniRule
- transcription, DNA-templated Source: UniProtKB-UniRule
- uncoating of virus Source: Reactome
- viral budding from plasma membrane Source: Reactome
- viral genome maturation Source: Reactome
- viral genome packaging Source: Reactome
- viral RNA genome replication Source: InterPro
- viral transcription Source: Reactome
- virion attachment to host cell Source: Reactome
Keywordsi
Enzyme and pathway databases
BRENDAi | 2.7.7.48 7479 |
Reactomei | R-HSA-168255 Influenza Life Cycle R-HSA-168271 Transport of Ribonucleoproteins into the Host Nucleus R-HSA-168275 Entry of Influenza Virion into Host Cell via Endocytosis R-HSA-168288 Fusion of the Influenza Virion to the Host Cell Endosome R-HSA-168298 Release R-HSA-168302 Budding R-HSA-168303 Packaging of Eight RNA Segments R-HSA-168325 Viral Messenger RNA Synthesis R-HSA-168330 Viral RNP Complexes in the Host Cell Nucleus R-HSA-168333 NEP/NS2 Interacts with the Cellular Export Machinery R-HSA-168336 Uncoating of the Influenza Virion R-HSA-192814 vRNA Synthesis R-HSA-192823 Viral mRNA Translation R-HSA-192869 cRNA Synthesis R-HSA-192905 vRNP Assembly |
Names & Taxonomyi
Protein namesi | Recommended name: Polymerase acidic proteinUniRule annotation (EC:3.1.-.-UniRule annotation)Alternative name(s): RNA-directed RNA polymerase subunit P2UniRule annotation |
Gene namesi | Name:PAUniRule annotation |
Organismi | Influenza A virus (strain A/Puerto Rico/8/1934 H1N1) |
Taxonomic identifieri | 211044 [NCBI] |
Taxonomic lineagei | Viruses › Riboviria › Negarnaviricota › Polyploviricotina › Insthoviricetes › Articulavirales › Orthomyxoviridae › Alphainfluenzavirus › |
Virus hosti | Aves [TaxID: 8782] Homo sapiens (Human) [TaxID: 9606] Sus scrofa (Pig) [TaxID: 9823] |
Proteomesi |
|
Subcellular locationi
- Host cytoplasm UniRule annotation
- Host nucleus UniRule annotation Note: PB1 and PA are transported in the host nucleus as a complex.UniRule annotation3 Publications
GO - Cellular componenti
- cytosol Source: Reactome
- endosome lumen Source: Reactome
- extracellular region Source: Reactome
- host cell cytoplasm Source: UniProtKB-SubCell
- host cell nucleus Source: UniProtKB-SubCell
- nucleoplasm Source: Reactome
Keywords - Cellular componenti
Host cytoplasm, Host nucleusPTM / Processingi
Molecule processing
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
ChainiPRO_0000078796 | 1 – 716 | Polymerase acidic proteinAdd BLAST | 716 |
Post-translational modificationi
Phosphorylated on serines and threonines by host kinases, including human casein kinase II.UniRule annotation1 Publication
Keywords - PTMi
PhosphoproteinProteomic databases
PRIDEi | P03433 |
Interactioni
Subunit structurei
Influenza RNA polymerase is composed of three subunits: PB1, PB2 and PA.
Interacts (via C-terminus) with PB1 (via N-terminus).
UniRule annotation1 PublicationBinary interactionsi
Protein-protein interaction databases
DIPi | DIP-43996N |
IntActi | P03433, 57 interactors |
MINTi | P03433 |
Chemistry databases
BindingDBi | P03433 |
Structurei
Secondary structure
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details3D structure databases
SMRi | P03433 |
ModBasei | Search... |
PDBe-KBi | Search... |
Miscellaneous databases
EvolutionaryTracei | P03433 |
Family & Domainsi
Motif
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Motifi | 124 – 139 | Nuclear localization signal 1 (NLS1)UniRule annotation1 PublicationAdd BLAST | 16 | |
Motifi | 184 – 247 | Nuclear localization signal 2 (NLS2)UniRule annotation1 PublicationAdd BLAST | 64 |
Sequence similaritiesi
Belongs to the influenza viruses PA family.UniRule annotation
Phylogenomic databases
KOi | K19390 |
OrthoDBi | 669at10239 |
Family and domain databases
Gene3Di | 3.40.91.90, 1 hit |
HAMAPi | MF_04063 INFV_PA, 1 hit |
InterProi | View protein in InterPro IPR037534 INFV_PA IPR001009 PA/PA-X IPR038372 PA/PA-X_sf |
Pfami | View protein in Pfam PF00603 Flu_PA, 1 hit |
s (2)i Sequence
Sequence statusi: Complete.
This entry describes 2 produced by isoformsiribosomal frameshifting. AlignAdd to basketIsoform PA (identifier: P03433-1) [UniParc]FASTAAdd to basket
This isoform has been chosen as the sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry. canonicali
10 20 30 40 50
MEDFVRQCFN PMIVELAEKT MKEYGEDLKI ETNKFAAICT HLEVCFMYSD
60 70 80 90 100
FHFINEQGES IIVELGDPNA LLKHRFEIIE GRDRTMAWTV VNSICNTTGA
110 120 130 140 150
EKPKFLPDLY DYKENRFIEI GVTRREVHIY YLEKANKIKS EKTHIHIFSF
160 170 180 190 200
TGEEMATKAD YTLDEESRAR IKTRLFTIRQ EMASRGLWDS FRQSERGEET
210 220 230 240 250
IEERFEITGT MRKLADQSLP PNFSSLENFR AYVDGFEPNG YIEGKLSQMS
260 270 280 290 300
KEVNARIEPF LKTTPRPLRL PNGPPCSQRS KFLLMDALKL SIEDPSHEGE
310 320 330 340 350
GIPLYDAIKC MRTFFGWKEP NVVKPHEKGI NPNYLLSWKQ VLAELQDIEN
360 370 380 390 400
EEKIPKTKNM KKTSQLKWAL GENMAPEKVD FDDCKDVGDL KQYDSDEPEL
410 420 430 440 450
RSLASWIQNE FNKACELTDS SWIELDEIGE DVAPIEHIAS MRRNYFTSEV
460 470 480 490 500
SHCRATEYIM KGVYINTALL NASCAAMDDF QLIPMISKCR TKEGRRKTNL
510 520 530 540 550
YGFIIKGRSH LRNDTDVVNF VSMEFSLTDP RLEPHKWEKY CVLEIGDMLI
560 570 580 590 600
RSAIGQVSRP MFLYVRTNGT SKIKMKWGME MRRCLLQSLQ QIESMIEAES
610 620 630 640 650
SVKEKDMTKE FFENKSETWP IGESPKGVEE SSIGKVCRTL LAKSVFNSLY
660 670 680 690 700
ASPQLEGFSA ESRKLLLIVQ ALRDNLEPGT FDLGGLYEAI EECLINDPWV
710
LLNASWFNSF LTHALS
Isoform PA-X (identifier: P0CK64-1) [UniParc]FASTAAdd to basket
The sequence of this isoform can be found in the external entry P0CK64.
Isoforms of the same protein are often annotated in two different entries if their sequences differ significantly.
Isoforms of the same protein are often annotated in two different entries if their sequences differ significantly.
Experimental Info
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Sequence conflicti | 550 | I → L in CAA24295 (PubMed:7060132). | 1 |
Sequence databases
Select the link destinations: EMBLi GenBanki DDBJi Links Updated | V01106 Genomic RNA Translation: CAA24295.1 AF389117 Genomic RNA Translation: AAM75157.1 EF467820 Genomic RNA Translation: ABO21708.1 CY009449 Genomic RNA Translation: ABD77682.1 |
RefSeqi | NP_040986.1, NC_002022.1 |
Genome annotation databases
GeneIDi | 956535 |
KEGGi | vg:956535 |
Keywords - Coding sequence diversityi
Ribosomal frameshiftingSimilar proteinsi
Cross-referencesi
Sequence databases
Select the link destinations: EMBLi GenBanki DDBJi Links Updated | V01106 Genomic RNA Translation: CAA24295.1 AF389117 Genomic RNA Translation: AAM75157.1 EF467820 Genomic RNA Translation: ABO21708.1 CY009449 Genomic RNA Translation: ABD77682.1 |
RefSeqi | NP_040986.1, NC_002022.1 |
3D structure databases
Select the link destinations: PDBei RCSB PDBi PDBji Links Updated | PDB entry | Method | Resolution (Å) | Chain | Positions | PDBsum |
2ZNL | X-ray | 2.30 | A | 239-716 | [»] | |
4YYL | X-ray | 1.91 | A | 1-50 | [»] | |
A | 73-197 | [»] | ||||
4ZHZ | X-ray | 2.50 | A | 1-50 | [»] | |
A | 73-197 | [»] | ||||
4ZI0 | X-ray | 1.80 | A | 1-50 | [»] | |
A | 73-197 | [»] | ||||
4ZQQ | X-ray | 1.80 | A | 1-50 | [»] | |
A | 73-197 | [»] | ||||
5FDD | X-ray | 2.51 | A | 1-50 | [»] | |
A | 73-197 | [»] | ||||
5FDG | X-ray | 2.10 | A | 1-50 | [»] | |
A | 73-197 | [»] | ||||
5I13 | X-ray | 2.15 | A | 1-50 | [»] | |
A | 73-197 | [»] | ||||
5JHT | X-ray | 1.75 | A | 1-50 | [»] | |
A | 73-197 | [»] | ||||
5JHV | X-ray | 2.75 | A/B | 1-50 | [»] | |
A/B | 73-197 | [»] | ||||
SMRi | P03433 | |||||
ModBasei | Search... | |||||
PDBe-KBi | Search... |
Protein-protein interaction databases
DIPi | DIP-43996N |
IntActi | P03433, 57 interactors |
MINTi | P03433 |
Chemistry databases
BindingDBi | P03433 |
ChEMBLi | CHEMBL1169598 |
Proteomic databases
PRIDEi | P03433 |
Genome annotation databases
GeneIDi | 956535 |
KEGGi | vg:956535 |
Phylogenomic databases
KOi | K19390 |
OrthoDBi | 669at10239 |
Enzyme and pathway databases
BRENDAi | 2.7.7.48 7479 |
Reactomei | R-HSA-168255 Influenza Life Cycle R-HSA-168271 Transport of Ribonucleoproteins into the Host Nucleus R-HSA-168275 Entry of Influenza Virion into Host Cell via Endocytosis R-HSA-168288 Fusion of the Influenza Virion to the Host Cell Endosome R-HSA-168298 Release R-HSA-168302 Budding R-HSA-168303 Packaging of Eight RNA Segments R-HSA-168325 Viral Messenger RNA Synthesis R-HSA-168330 Viral RNP Complexes in the Host Cell Nucleus R-HSA-168333 NEP/NS2 Interacts with the Cellular Export Machinery R-HSA-168336 Uncoating of the Influenza Virion R-HSA-192814 vRNA Synthesis R-HSA-192823 Viral mRNA Translation R-HSA-192869 cRNA Synthesis R-HSA-192905 vRNP Assembly |
Miscellaneous databases
EvolutionaryTracei | P03433 |
Family and domain databases
Gene3Di | 3.40.91.90, 1 hit |
HAMAPi | MF_04063 INFV_PA, 1 hit |
InterProi | View protein in InterPro IPR037534 INFV_PA IPR001009 PA/PA-X IPR038372 PA/PA-X_sf |
Pfami | View protein in Pfam PF00603 Flu_PA, 1 hit |
ProtoNeti | Search... |
MobiDBi | Search... |
Entry informationi
Entry namei | PA_I34A1 | |
Accessioni | P03433Primary (citable) accession number: P03433 Secondary accession number(s): A4GXH3, Q20N31, Q8JUU6 | |
Entry historyi | Integrated into UniProtKB/Swiss-Prot: | July 21, 1986 |
Last sequence update: | October 2, 2007 | |
Last modified: | September 18, 2019 | |
This is version 122 of the entry and version 2 of the sequence. See complete history. | ||
Entry statusi | Reviewed (UniProtKB/Swiss-Prot) | |
Annotation program | Viral Protein Annotation Program |
Miscellaneousi
Keywords - Technical termi
3D-structure, Complete proteome, Reference proteomeDocuments
- SIMILARITY comments
Index of protein domains and families - PDB cross-references
Index of Protein Data Bank (PDB) cross-references