ID A0A075BI22_9INFA Unreviewed; 757 AA. AC A0A075BI22; DT 29-OCT-2014, integrated into UniProtKB/TrEMBL. DT 04-FEB-2015, sequence version 2. DT 09-DEC-2015, entry version 9. DE RecName: Full=RNA-directed RNA polymerase catalytic subunit {ECO:0000256|RuleBase:RU004330, ECO:0000256|SAAS:SAAS00377010}; DE EC=2.7.7.48 {ECO:0000256|RuleBase:RU004330, ECO:0000256|SAAS:SAAS00376969}; GN Name=PB1 {ECO:0000313|EMBL:AGK23693.2}; OS Influenza A virus (A/chicken/Shandong/11/2011(H9N2)). OC Viruses; ssRNA viruses; ssRNA negative-strand viruses; OC Orthomyxoviridae; Influenzavirus A. OX NCBI_TaxID=1309781 {ECO:0000313|EMBL:AGK23693.2}; RN [1] {ECO:0000313|EMBL:AGK23693.2} RP NUCLEOTIDE SEQUENCE. RC STRAIN=A/chicken/Shandong/11/2011 {ECO:0000313|EMBL:AGK23693.2}; RX PubMed=25548189; DOI=10.1073/pnas.1422456112; RA Pu J., Wang S., Yin Y., Zhang G., Carter R.A., Wang J., Xu G., Sun H., RA Wang M., Wen C., Wei Y., Wang D., Zhu B., Lemmon G., Jiao Y., Duan S., RA Wang Q., Du Q., Sun M., Bao J., Sun Y., Zhao J., Zhang H., Wu G., RA Liu J., Webster R.G.; RT "Evolution of the H9N2 influenza genotype that facilitated the genesis RT of the novel H7N9 virus."; RL Proc. Natl. Acad. Sci. U.S.A. 112:548-553(2015). CC -!- FUNCTION: RNA-dependent RNA polymerase which is responsible for CC replication and transcription of virus RNA segments. The CC transcription of viral mRNAs occurs by a unique mechanism called CC cap-snatching. 5' methylated caps of cellular mRNAs are cleaved CC after 10-13 nucleotides by PA. In turn, these short capped RNAs CC are used as primers by PB1 for transcription of viral mRNAs. CC During virus replication, PB1 initiates RNA synthesis and copy CC vRNA into complementary RNA (cRNA) which in turn serves as a CC template for the production of more vRNAs. CC {ECO:0000256|SAAS:SAAS00377137}. CC -!- CATALYTIC ACTIVITY: Nucleoside triphosphate + RNA(n) = diphosphate CC + RNA(n+1). {ECO:0000256|RuleBase:RU004330, CC ECO:0000256|SAAS:SAAS00376950}. CC -!- SUBUNIT: Influenza RNA polymerase is composed of three subunits: CC PB1, PB2 and PA. Interacts (via N-terminus) with PA (via C- CC terminus). Interacts (via C-terminus) with PB2 (via N-terminus); CC this interaction is essential for transcription initiation. CC {ECO:0000256|SAAS:SAAS00377302}. CC -!- SIMILARITY: Contains RdRp catalytic domain. CC {ECO:0000256|SAAS:SAAS00377245}. CC --------------------------------------------------------------------------- CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms CC Distributed under the Creative Commons Attribution (CC BY 4.0) License CC --------------------------------------------------------------------------- DR EMBL; KC821097; AGK23693.2; -; Viral_cRNA. DR GO; GO:0000166; F:nucleotide binding; IEA:UniProtKB-KW. DR GO; GO:0003968; F:RNA-directed RNA polymerase activity; IEA:UniProtKB-KW. DR GO; GO:0039523; P:suppression by virus of host RNA polymerase II activity; IEA:UniProtKB-KW. DR GO; GO:0006351; P:transcription, DNA-templated; IEA:InterPro. DR GO; GO:0039694; P:viral RNA genome replication; IEA:InterPro. DR GO; GO:0019083; P:viral transcription; IEA:UniProtKB-KW. DR InterPro; IPR007099; RNA-dir_pol_NSvirus. DR InterPro; IPR001407; RNA_pol_PB1_influenza. DR Pfam; PF00602; Flu_PB1; 1. DR PIRSF; PIRSF000827; RdRPol_OMV; 1. DR PROSITE; PS50525; RDRP_SSRNA_NEG_SEG; 1. PE 4: Predicted; KW Eukaryotic host gene expression shutoff by virus KW {ECO:0000256|SAAS:SAAS00239605}; KW Eukaryotic host transcription shutoff by virus KW {ECO:0000256|SAAS:SAAS00239775}; KW Host gene expression shutoff by virus {ECO:0000256|SAAS:SAAS00239728}; KW Host-virus interaction {ECO:0000256|SAAS:SAAS00239786}; KW Inhibition of host RNA polymerase II by virus KW {ECO:0000256|SAAS:SAAS00239606}; KW Nucleotide-binding {ECO:0000256|SAAS:SAAS00276578}; KW Nucleotidyltransferase {ECO:0000256|SAAS:SAAS00276602}; KW RNA-directed RNA polymerase {ECO:0000256|RuleBase:RU004330, KW ECO:0000256|SAAS:SAAS00276589}; KW Transferase {ECO:0000256|SAAS:SAAS00276586}; KW Viral RNA replication {ECO:0000256|SAAS:SAAS00276580}; KW Viral transcription {ECO:0000256|SAAS:SAAS00239449}. FT DOMAIN 286 483 RdRp catalytic. {ECO:0000259|PROSITE: FT PS50525}. SQ SEQUENCE 757 AA; 86419 MW; 1A64564C300371F9 CRC64; MDVNPTLLFL KVPVQNAIST TFPYTGDPPY SHGTGTGYTM DTVNRTHKYS EKGKWTTNTE TGAPQLNPID GPLPEDNEPS GYAQTDCVLE AMAFLEESHP GIFENSCLET MEIVQQTRVD KLTQGRQTYD WTLNRNQPAA TALANTIEVF RSNGLTANES GRLIDFLKDV MDSMDKEEME VTTHFQRKRR VRDNMTKKMV TQRTIGKKKQ RLNKRSYLIR ALTLNTMTKD AERGKLKRRA IATPGMQIRG FVYFVEALAR SICEKLEQSG LPVGGNEKKA KLANVVRKMM TNSHDTELSF TITGDNTKWN ENQNPRMFLA MITYITRNQP EWFRNVLSIA PIMFSNKMAR LGKGYMFESK SMKLRTQVPA EMLANIDLKY FNKSTREKIE KIRPLLIDGT ASLSPGMMMG MFNMLSTVLG VSILNLGQKK YTKTTYWWDG LQSSDDFALI VNAPNHEGIQ AGVDRFYRTC KLVGINMSKK KSYINRTGTF EFTSFFYRYG FVANFSMELP SFGVSGINES ADMSIGVTVI KNNMINNDLG PATAQMALQL FIKDYRYTYR CHRGDTQIQT RRAFELKKLW EQTRSKAGLL VSDGGPNLYN IRNLHIPEVC LKWELMDEDY QGRLCNPMNP FVSHKEIDSV NNAVVMPAHG PAKNMEYDAV ATTHSWIPKR NRSILNTSQR GILEDEQMYQ KCCNLFEKFF PSSSYRRPVG ISSMVEAMVS RARIDARIDF ESGRIKKEEF AEIMKICSTI EELRRQK //