PA_I02A0
ID PA_I02A0 Reviewed; 716 AA.
AC Q0A2K9;
DT 06-MAR-2007, integrated into UniProtKB/Swiss-Prot.
DT 17-OCT-2006, sequence version 1.
DT 03-AUG-2022, entry version 54.
DE RecName: Full=Polymerase acidic protein {ECO:0000255|HAMAP-Rule:MF_04063};
DE EC=3.1.-.- {ECO:0000255|HAMAP-Rule:MF_04063};
DE AltName: Full=RNA-directed RNA polymerase subunit P2 {ECO:0000255|HAMAP-Rule:MF_04063};
GN Name=PA {ECO:0000255|HAMAP-Rule:MF_04063};
OS Influenza A virus (strain A/Chicken/Brescia/1902 H7N7).
OC Viruses; Riboviria; Orthornavirae; Negarnaviricota; Polyploviricotina;
OC Insthoviricetes; Articulavirales; Orthomyxoviridae; Alphainfluenzavirus.
OX NCBI_TaxID=36418;
OH NCBI_TaxID=8782; Aves.
OH NCBI_TaxID=9796; Equus caballus (Horse).
OH NCBI_TaxID=9606; Homo sapiens (Human).
OH NCBI_TaxID=9709; Phocidae (true seals).
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC RNA].
RX PubMed=16439620; DOI=10.1126/science.1121586;
RA Obenauer J.C., Denson J., Mehta P.K., Su X., Mukatira S., Finkelstein D.B.,
RA Xu X., Wang J., Ma J., Fan Y., Rakestraw K.M., Webster R.G., Hoffmann E.,
RA Krauss S., Zheng J., Zhang Z., Naeve C.W.;
RT "Large-scale sequence analysis of avian influenza isolates.";
RL Science 311:1576-1580(2006).
CC -!- FUNCTION: Plays an essential role in viral RNA transcription and
CC replication by forming the heterotrimeric polymerase complex together
CC with PB1 and PB2 subunits. The complex transcribes viral mRNAs by using
CC a unique mechanism called cap-snatching. It consists in the hijacking
CC and cleavage of host capped pre-mRNAs. These short capped RNAs are then
CC used as primers for viral mRNAs. The PB2 subunit is responsible for the
CC binding of the 5' cap of cellular pre-mRNAs which are subsequently
CC cleaved after 10-13 nucleotides by the PA subunit that carries the
CC endonuclease activity. {ECO:0000255|HAMAP-Rule:MF_04063}.
CC -!- COFACTOR:
CC Name=Mn(2+); Xref=ChEBI:CHEBI:29035;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_04063};
CC Note=Binds 2 manganese ions per subunit. {ECO:0000255|HAMAP-
CC Rule:MF_04063};
CC -!- SUBUNIT: Influenza RNA polymerase is composed of three subunits: PB1,
CC PB2 and PA. Interacts (via C-terminus) with PB1 (via N-terminus).
CC {ECO:0000250|UniProtKB:P03433, ECO:0000255|HAMAP-Rule:MF_04063}.
CC -!- SUBCELLULAR LOCATION: Host cytoplasm {ECO:0000255|HAMAP-Rule:MF_04063}.
CC Host nucleus {ECO:0000255|HAMAP-Rule:MF_04063}. Note=PB1 and PA are
CC transported in the host nucleus as a complex.
CC {ECO:0000250|UniProtKB:P03433, ECO:0000255|HAMAP-Rule:MF_04063}.
CC -!- ALTERNATIVE PRODUCTS:
CC Event=Ribosomal frameshifting; Named isoforms=2;
CC Name=PA;
CC IsoId=Q0A2K9-1; Sequence=Displayed;
CC Name=PA-X;
CC IsoId=P0CK69-1; Sequence=External;
CC -!- PTM: Phosphorylated on serines and threonines by host kinases,
CC including human casein kinase II. {ECO:0000250|UniProtKB:P03433,
CC ECO:0000255|HAMAP-Rule:MF_04063}.
CC -!- SIMILARITY: Belongs to the influenza viruses PA family.
CC {ECO:0000255|HAMAP-Rule:MF_04063}.
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DR EMBL; CY015057; ABI85073.1; -; Genomic_RNA.
DR SMR; Q0A2K9; -.
DR PRIDE; Q0A2K9; -.
DR Proteomes; UP000160986; Genome.
DR GO; GO:0030430; C:host cell cytoplasm; IEA:UniProtKB-SubCell.
DR GO; GO:0042025; C:host cell nucleus; IEA:UniProtKB-SubCell.
DR GO; GO:0004519; F:endonuclease activity; IEA:UniProtKB-KW.
DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR GO; GO:0003723; F:RNA binding; IEA:UniProtKB-UniRule.
DR GO; GO:0075526; P:cap snatching; IEA:UniProtKB-UniRule.
DR GO; GO:0039523; P:suppression by virus of host mRNA transcription via inhibition of RNA polymerase II activity; IEA:UniProtKB-UniRule.
DR GO; GO:0006351; P:transcription, DNA-templated; IEA:UniProtKB-UniRule.
DR GO; GO:0039694; P:viral RNA genome replication; IEA:InterPro.
DR Gene3D; 3.40.91.90; -; 1.
DR HAMAP; MF_04063; INFV_PA; 1.
DR InterPro; IPR037534; INFV_PA.
DR InterPro; IPR001009; PA/PA-X.
DR InterPro; IPR038372; PA/PA-X_sf.
DR Pfam; PF00603; Flu_PA; 1.
PE 3: Inferred from homology;
KW Cap snatching; Endonuclease;
KW Eukaryotic host gene expression shutoff by virus;
KW Eukaryotic host transcription shutoff by virus; Host cytoplasm;
KW Host gene expression shutoff by virus; Host nucleus;
KW Host-virus interaction; Hydrolase;
KW Inhibition of host RNA polymerase II by virus; Manganese; Metal-binding;
KW Nuclease; Phosphoprotein; Ribosomal frameshifting.
FT CHAIN 1..716
FT /note="Polymerase acidic protein"
FT /id="PRO_0000279587"
FT MOTIF 124..139
FT /note="Nuclear localization signal 1 (NLS1)"
FT /evidence="ECO:0000250|UniProtKB:P03433, ECO:0000255|HAMAP-
FT Rule:MF_04063"
FT MOTIF 184..247
FT /note="Nuclear localization signal 2 (NLS2)"
FT /evidence="ECO:0000250|UniProtKB:P03433, ECO:0000255|HAMAP-
FT Rule:MF_04063"
FT BINDING 41
FT /ligand="Mn(2+)"
FT /ligand_id="ChEBI:CHEBI:29035"
FT /ligand_label="1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04063"
FT BINDING 80
FT /ligand="Mn(2+)"
FT /ligand_id="ChEBI:CHEBI:29035"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04063"
FT BINDING 108
FT /ligand="Mn(2+)"
FT /ligand_id="ChEBI:CHEBI:29035"
FT /ligand_label="1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04063"
FT BINDING 108
FT /ligand="Mn(2+)"
FT /ligand_id="ChEBI:CHEBI:29035"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04063"
FT BINDING 119
FT /ligand="Mn(2+)"
FT /ligand_id="ChEBI:CHEBI:29035"
FT /ligand_label="1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04063"
FT BINDING 120
FT /ligand="Mn(2+)"
FT /ligand_id="ChEBI:CHEBI:29035"
FT /ligand_label="1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04063"
SQ SEQUENCE 716 AA; 82654 MW; 2430C45E639D7A47 CRC64;
MEDFVRQCFN PMIVELAEKA MKEYGEDPKL ETNKFAAICT HLEVCFMYSD FHFIDERGES
IIVESSDPNA LLKHRFEIIE GRDRTMAWTV VNSICNTTGV EKPKFLPDLY DYKENRFIEV
GVTRREVHIY YLEKANKIKS EKTHIHIFSF TGEEMATKED YTLDEESRAR IKTRLYTIRQ
EMASRGLWDS FRQSERGEET IEERFEITGT MRRLADQSLP PNFSSLENFR AYVDGFEPNG
CIEGKLSQMS KEVNARIEPF LKTTPRPLRL PDGPPCSQRS KFLLMDALKL SIEDPSHEGE
GIPLYDAIKC MKTFFGWKEP NIVKPHEKGI NPNYLLAWKQ VLAELQDIEN EEKIPKTKNM
KKTSQLKWAL GENMAPEKVD FEDCKDVSDL KQYDSDEPER RSPASWIQSE FNKACELTDS
SWIELDEIGE DVAPIEHIAS MRRNYFTAEV SHCRATEYIM KGVYINTALL NASCAAMDDF
QLIPMISKCR TKEGRRKTNL YGFIIKGRSH LRNDTDVVNF VSMEFSLTDP RLEPHKWEKY
CVLEIGDMLL RTAIGQVSRP MFLYVRTNGT SKIKMKWGME MRRCLLQSLQ QIESMIEAES
SVKEKDMTKE FFENKSETWP IGESPKGVEE GSIGKVCRTL LAKSVFNSLY ASPQLEGFSA
ESRKLLLIVQ ALRDNLEPGT FNLGGLYEAI EECLINDPWV LLNASWFNSF LTHALK
