ID   PB2_I80A2               Reviewed;         759 AA.
AC   Q2VC93;
DT   06-MAR-2007, integrated into UniProtKB/Swiss-Prot.
DT   10-JAN-2006, sequence version 1.
DT   03-AUG-2022, entry version 75.
DE   RecName: Full=Polymerase basic protein 2 {ECO:0000255|HAMAP-Rule:MF_04062};
DE   AltName: Full=RNA-directed RNA polymerase subunit P3 {ECO:0000255|HAMAP-Rule:MF_04062};
GN   Name=PB2 {ECO:0000255|HAMAP-Rule:MF_04062};
OS   Influenza A virus (strain A/Seal/Massachusetts/1/1980 H7N7).
OC   Viruses; Riboviria; Orthornavirae; Negarnaviricota; Polyploviricotina;
OC   Insthoviricetes; Articulavirales; Orthomyxoviridae; Alphainfluenzavirus.
OX   NCBI_TaxID=384493;
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].
RC   STRAIN=SC35M mouse-adapted;
RX   PubMed=16339318; DOI=10.1073/pnas.0507415102;
RA   Gabriel G., Dauber B., Wolff T., Planz O., Klenk H.D., Stech J.;
RT   "The viral polymerase mediates adaptation of an avian influenza virus to a
RT   mammalian host.";
RL   Proc. Natl. Acad. Sci. U.S.A. 102:18590-18595(2005).
CC   -!- FUNCTION: Plays an essential role in transcription initiation and cap-
CC       stealing mechanism, in which cellular capped pre-mRNAs are used to
CC       generate primers for viral transcription. Recognizes and binds the 7-
CC       methylguanosine-containing cap of the target pre-RNA which is
CC       subsequently cleaved after 10-13 nucleotides by the viral protein PA.
CC       Plays a role in the initiation of the viral genome replication and
CC       modulates the activity of the ribonucleoprotein (RNP) complex.
CC       {ECO:0000255|HAMAP-Rule:MF_04062}.
CC   -!- SUBUNIT: Influenza RNA polymerase is composed of three subunits: PB1,
CC       PB2 and PA. Interacts (via N-terminus) with PB1 (via C-terminus).
CC       Interacts with nucleoprotein NP (via N-terminus). {ECO:0000255|HAMAP-
CC       Rule:MF_04062}.
CC   -!- SUBCELLULAR LOCATION: Virion {ECO:0000255|HAMAP-Rule:MF_04062}. Host
CC       nucleus {ECO:0000255|HAMAP-Rule:MF_04062}.
CC   -!- MISCELLANEOUS: SC35 was derived from A/Seal/Massachussetts/1/80 (H7N7)
CC       by serial passages in chicken embryo cells, thereby acquiring a
CC       multibasic cleavage site in its hemagglutinin (HA) and becoming 100%
CC       lethal for chickens. SC35 was then passaged 11 times in mouse lung,
CC       yielding the mouse-adapted variant SC35M.
CC   -!- SIMILARITY: Belongs to the influenza viruses PB2 family.
CC       {ECO:0000255|HAMAP-Rule:MF_04062}.
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DR   EMBL; DQ266097; ABB90270.1; -; Genomic_RNA.
DR   SMR; Q2VC93; -.
DR   PRO; PR:Q2VC93; -.
DR   Proteomes; UP000008576; Genome.
DR   GO; GO:0042025; C:host cell nucleus; IEA:UniProtKB-SubCell.
DR   GO; GO:0044423; C:virion component; IEA:UniProtKB-UniRule.
DR   GO; GO:0003723; F:RNA binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0003968; F:RNA-directed 5'-3' RNA polymerase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0006370; P:7-methylguanosine mRNA capping; 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; 3.30.30.90; -; 1.
DR   HAMAP; MF_04062; INV_PB2; 1.
DR   InterPro; IPR001591; INV_PB2.
DR   InterPro; IPR037258; PDB2_C.
DR   Pfam; PF00604; Flu_PB2; 1.
DR   SUPFAM; SSF160453; SSF160453; 1.
PE   3: Inferred from homology;
KW   Cap snatching; Eukaryotic host gene expression shutoff by virus;
KW   Eukaryotic host transcription shutoff by virus;
KW   Host gene expression shutoff by virus; Host nucleus;
KW   Host-virus interaction; Inhibition of host RNA polymerase II by virus;
KW   mRNA capping; mRNA processing; Viral transcription; Virion.
FT   CHAIN           1..759
FT                   /note="Polymerase basic protein 2"
FT                   /id="PRO_0000279646"
FT   MOTIF           736..739
FT                   /note="Nuclear localization signal"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04062"
FT   SITE            627
FT                   /note="Avian adaptation"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04062"
SQ   SEQUENCE   759 AA;  86062 MW;  767B74A30E74AEF1 CRC64;
     MERIKELRDL MSQSRTREIL TKTTVDHMAI IKKYTSGRQE KNPALRMKWM MAMKYPITAD
     KRIMEMIPER NEQGQTLWSK TNDAGSDRVM VSPLAVTWWN RNGPTTSTVH YPKVYKTYFE
     KVERMKHGTF GPVHFRNQVK IRRRVDINPG HADLSAKEAQ DVIMEVVFPN EVGARILTSE
     SQLTITKEKK EKLQDCKIAP LMVAYMLERE LVRKTRFLPV AGGTSSVYIE VLHLTQGTCW
     EQMYTPGGEV RNDDIDQSLI IAARNIVRRA TVSADPLASL LEMCHSTQIG GIRMVDILRQ
     NPTEEQAVDI CKAAMGLRIS SSFSFGGFTF KRISGSSVKR EEEVLTGNLQ TLKIRVHEGY
     EEFTMVGRRA TAILRKATRR LIQLIVSGRD EQSIAEAIIV AMVFSQEDCM IKAVRGDLNF
     VNRANQRLNP MHQLLRHFQK DAKVLFQNWG IEPIDNVMGM IGILPDMTPS TEMSLRGIRV
     SKMGVDEYSS TERVVVSIDR FLRVRDQRGN VLLSPEEVSE TQGTEKLTIT YSSSMMWEIN
     GPESVLINTY QWIIRNWETV KIQWSQDPTM LYNKMEFEPF QSLVPKAARG QYSGFVRTLF
     QQMRDVLGTF DTVQIIKLLP FAAAPPEQSR MQFSSLTVNV RGSGMRILIR GNSPVFNYNK
     ATKRLTVLGK DAGALTEDPD EGTAGVESAV LRGFLILGKE NKRYGPALSI NELRNLAKGE
     KANVLIGQGD VVLVMKRKRD SSILTDSQTA TKRIRMAIN