PA_I77AB
ID PA_I77AB Reviewed; 716 AA.
AC Q1WP02;
DT 06-MAR-2007, integrated into UniProtKB/Swiss-Prot.
DT 02-MAY-2006, sequence version 1.
DT 03-AUG-2022, entry version 59.
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/USSR/90/1977 H1N1).
OC Viruses; Riboviria; Orthornavirae; Negarnaviricota; Polyploviricotina;
OC Insthoviricetes; Articulavirales; Orthomyxoviridae; Alphainfluenzavirus.
OX NCBI_TaxID=381516;
OH NCBI_TaxID=8782; Aves.
OH NCBI_TaxID=9606; Homo sapiens (Human).
OH NCBI_TaxID=9823; Sus scrofa (Pig).
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC RNA].
RA Ghedin E., Spiro D., Miller N., Zaborsky J., Feldblyum T., Subbu V.,
RA Shumway M., Sparenborg J., Groveman L., Halpin R., Sitz J., Koo H.,
RA Salzberg S.L., Webster R.G., Hoffmann E., Krauss S., Naeve C., Bao Y.,
RA Bolotov P., Dernovoy D., Kiryutin B., Lipman D.J., Tatusova T.;
RT "The NIAID influenza genome sequencing project.";
RL Submitted (MAR-2006) to the EMBL/GenBank/DDBJ databases.
RN [2]
RP NUCLEOTIDE SEQUENCE [GENOMIC RNA].
RA Mbawuike I.N., Zhang Y., Yamada R.E., Nino D., Bui H.-H., Sette A.,
RA Couch R.B.;
RT "Complete genome sequencing and analysis of selected influenza virus
RT vaccine strains spanning six decades (1933-1999).";
RL Submitted (APR-2006) to the EMBL/GenBank/DDBJ databases.
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=Q1WP02-1; Sequence=Displayed;
CC Name=PA-X;
CC IsoId=P0DJW7-1; 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; CY010377; ABD95357.1; -; Genomic_RNA.
DR EMBL; DQ508896; ABF21263.1; -; Genomic_RNA.
DR SMR; Q1WP02; -.
DR MEROPS; S62.001; -.
DR Proteomes; UP000007793; Genome.
DR Proteomes; UP000121508; 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_0000279267"
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; 82834 MW; A3FE2C274D3D20CB CRC64;
MEDFVRQCFN PMIVELAEKA MKEYGEDLKI ETNKFAAICT HLEVCFMYSD FHFINEQGES
IIVELDDPNA LLKHRFEIIE GRDRTMAWTV VNSICNTTGA EKPKFLPDLY DYKENRFIEI
GVTRREVHIY YLEKANKIKS EKTHIHIFSF TGEEMATKAD YTLDEESRAR IKTRLFTIRQ
EMASRGLWDS FRQSERGEET IEERFEITGT MRRLADQSLP PNFSCLENFR AYVDGFEPNG
YIEGKLSQMS KEVNARIEPF LKTTPRPIRL PDGPPCSQRS KFLLMDALKL SIEDPSHEGE
GIPLYDAIKC MRTFFGWKEP YVVKPHEKGI NPNYLLSWKQ VLAELQDIEN EEKIPRTKNM
KKTSQLKWAL GENMAPEKVD FDDCKDISDL KQYDSDEPEL RSLSSWIQNE FNKACELTDS
IWIELDEIGE DVAPIEHIAS MRRNYFTAEV SHCRATEYIM KGVYINTALL NASCAAMDDF
QLIPMISKCR TKEGRRKTNL YGFIIKGRSH LRNDTDVVNF VSMEFSLTDP RLEPHKWEKY
CVLEIGDMLL RSAIGQVSRP MFLYVRTNGT SKIKMKWGME MRRCLLQSLQ QIESMIEAES
SVKEKDMTKE FFENKSETWP IGESPKGVEE GSIGKVCRTL LAKSVFNSLY ASPQLEGFSA
ESRKLLLVVQ ALRDNLEPGT FDLGGLYEAI EECLINDPWV LLNASWFNSF LTHALR
