PA_I02A3
ID PA_I02A3 Reviewed; 693 AA.
AC Q6DNX8;
DT 13-NOV-2007, integrated into UniProtKB/Swiss-Prot.
DT 16-AUG-2004, sequence version 1.
DT 03-AUG-2022, entry version 49.
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};
DE Flags: Fragment;
GN Name=PA {ECO:0000255|HAMAP-Rule:MF_04063};
OS Influenza A virus (strain A/Chicken/Hong Kong/37.4/2002 H5N1 genotype X2).
OC Viruses; Riboviria; Orthornavirae; Negarnaviricota; Polyploviricotina;
OC Insthoviricetes; Articulavirales; Orthomyxoviridae; Alphainfluenzavirus.
OX NCBI_TaxID=284172;
OH NCBI_TaxID=8782; Aves.
OH NCBI_TaxID=9685; Felis catus (Cat) (Felis silvestris catus).
OH NCBI_TaxID=9606; Homo sapiens (Human).
OH NCBI_TaxID=9691; Panthera pardus (Leopard) (Felis pardus).
OH NCBI_TaxID=9694; Panthera tigris (Tiger).
OH NCBI_TaxID=9823; Sus scrofa (Pig).
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC RNA].
RX PubMed=15241415; DOI=10.1038/nature02746;
RA Li K.S., Guan Y., Wang J., Smith G.J.D., Xu K.M., Duan L., Rahardjo A.P.,
RA Puthavathana P., Buranathai C., Nguyen T.D., Estoepangestie A.T.S.,
RA Chaisingh A., Auewarakul P., Long H.T., Hanh N.T.H., Webby R.J.,
RA Poon L.L.M., Chen H., Shortridge K.F., Yuen K.Y., Webster R.G.,
RA Peiris J.S.M.;
RT "Genesis of a highly pathogenic and potentially pandemic H5N1 influenza
RT virus in eastern Asia.";
RL Nature 430:209-213(2004).
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: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. {ECO:0000255|HAMAP-
CC Rule:MF_04063}.
CC -!- ALTERNATIVE PRODUCTS:
CC Event=Ribosomal frameshifting; Named isoforms=2;
CC Name=PA;
CC IsoId=Q6DNX8-1; Sequence=Displayed;
CC Name=PA-X;
CC IsoId=Q6DNX8-2; Sequence=Not described;
CC -!- PTM: Phosphorylated on serines and threonines by host kinases,
CC including human casein kinase II. {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; AY651624; AAT74500.1; -; Genomic_RNA.
DR SMR; Q6DNX8; -.
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:InterPro.
DR GO; GO:0075526; P:cap snatching; IEA:UniProtKB-KW.
DR GO; GO:0039523; P:suppression by virus of host mRNA transcription via inhibition of RNA polymerase II activity; IEA:UniProtKB-KW.
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..693
FT /note="Polymerase acidic protein"
FT /id="PRO_0000311135"
FT MOTIF 101..116
FT /note="Nuclear localization signal 1 (NLS1)"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04063"
FT MOTIF 161..224
FT /note="Nuclear localization signal 2 (NLS2)"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04063"
FT BINDING 18
FT /ligand="Mn(2+)"
FT /ligand_id="ChEBI:CHEBI:29035"
FT /ligand_label="1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04063"
FT BINDING 57
FT /ligand="Mn(2+)"
FT /ligand_id="ChEBI:CHEBI:29035"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04063"
FT BINDING 85
FT /ligand="Mn(2+)"
FT /ligand_id="ChEBI:CHEBI:29035"
FT /ligand_label="1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04063"
FT BINDING 85
FT /ligand="Mn(2+)"
FT /ligand_id="ChEBI:CHEBI:29035"
FT /ligand_label="2"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04063"
FT BINDING 96
FT /ligand="Mn(2+)"
FT /ligand_id="ChEBI:CHEBI:29035"
FT /ligand_label="1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04063"
FT BINDING 97
FT /ligand="Mn(2+)"
FT /ligand_id="ChEBI:CHEBI:29035"
FT /ligand_label="1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_04063"
FT NON_TER 1
SQ SEQUENCE 693 AA; 79766 MW; C05B1E8FBF9BB5AB CRC64;
YGEDPKVETN KFAAICTHLE VCFMYSDFHF IDERNESIIV ESGDPNALLK HRFEIIEGRD
RTMAWTVVNS ICNTTGVEKP KFLPDLYDYK ENRFIEIGVT RREVHIYYLE KANKIKSEKT
HIHIFSFTGE EMATKADYIL DEESRARIKT RLFTIRQEMA SRGLWDSFRQ SERGEETIEE
RFEINGTMRR LADQSLPPNF SSLENFRAYV DGFEPNGCIE GKLSQMSKEV NARIEPFLKT
TPRPLRLPDG PPCSQRSKFL LMDALKLSIE DPSHEGEGIP LYDAIKCMKT FFGWKEPNIV
KPHEKGINPN YLLAWKQVLA EIQDIENEEK IPKTKNMKKT GQLKWALGEN MAPEKVDFED
CKDVSDLRQY NSDEPESRSL ASWIQSEFNK ACELTDSSWI ELDEIGEDVA PIEHIASMRR
NYFTAEVSHC RATEYIMKGV YINTALLNAS CAAMDDFQLI PMISKCRTKE GRRKTNLYGF
IIKGRSHLRN DTDVVNFVSM EFSLTDPRLE PHKWEKYCVL EIGDMLLRTA IGQVSRPMFL
YVRTNGTSKI KMKWGMEMRR CLLQSLQQIE SMIEAESSVK EKDMTKEFFE SKSETWPIGE
SPKGVEEGSI GKVCRTLLAK SVFNSLYASP QLEGFSAESR RLLLIVQALG DNLEPGTFDL
GGLYEAIEEC LINDPWVLLN ASWFNSFLTH ALR
