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Database: UniProt
Entry: Q20V33_9INFA
LinkDB: Q20V33_9INFA
Original site: Q20V33_9INFA 
ID   Q20V33_9INFA            Unreviewed;       757 AA.
AC   Q20V33;
DT   18-APR-2006, integrated into UniProtKB/TrEMBL.
DT   18-APR-2006, sequence version 1.
DT   24-JAN-2024, entry version 79.
DE   RecName: Full=RNA-directed RNA polymerase catalytic subunit {ECO:0000256|HAMAP-Rule:MF_04065};
DE            EC=2.7.7.48 {ECO:0000256|HAMAP-Rule:MF_04065};
DE   AltName: Full=Polymerase basic protein 1 {ECO:0000256|HAMAP-Rule:MF_04065};
DE            Short=PB1 {ECO:0000256|HAMAP-Rule:MF_04065};
DE   AltName: Full=RNA-directed RNA polymerase subunit P1 {ECO:0000256|HAMAP-Rule:MF_04065};
GN   Name=PB1 {ECO:0000256|HAMAP-Rule:MF_04065,
GN   ECO:0000313|EMBL:ABB19225.1};
OS   Influenza A virus (A/mallard duck/ALB/155/1990(H6N3)).
OC   Viruses; Riboviria; Orthornavirae; Negarnaviricota; Polyploviricotina;
OC   Insthoviricetes; Articulavirales; Orthomyxoviridae; Alphainfluenzavirus;
OC   Alphainfluenzavirus influenzae; Influenza A virus.
OX   NCBI_TaxID=352726 {ECO:0000313|EMBL:ABB19225.1, ECO:0000313|Proteomes:UP000117224};
RN   [1] {ECO:0000313|EMBL:ABB19225.1, ECO:0000313|Proteomes:UP000117224}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=A/mallard duck/ALB/155/1990 {ECO:0000313|EMBL:ABB19225.1};
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: RNA-dependent RNA polymerase which is responsible for
CC       replication and transcription of virus RNA segments. The transcription
CC       of viral mRNAs occurs by a unique mechanism called cap-snatching. 5'
CC       methylated caps of cellular mRNAs are cleaved after 10-13 nucleotides
CC       by PA. In turn, these short capped RNAs are used as primers by PB1 for
CC       transcription of viral mRNAs. During virus replication, PB1 initiates
CC       RNA synthesis and copies vRNA into complementary RNA (cRNA) which in
CC       turn serves as a template for the production of more vRNAs.
CC       {ECO:0000256|HAMAP-Rule:MF_04065}.
CC   -!- FUNCTION: RNA-dependent RNA polymerase which is responsible for
CC       replication and transcription of virus RNA segments. The transcription
CC       of viral mRNAs occurs by a unique mechanism called cap-snatching. 5'
CC       methylated caps of cellular mRNAs are cleaved after 10-13 nucleotides
CC       by PA. In turn, these short capped RNAs are used as primers by PB1 for
CC       transcription of viral mRNAs. During virus replication, PB1 initiates
CC       RNA synthesis and copy vRNA into complementary RNA (cRNA) which in turn
CC       serves as a template for the production of more vRNAs.
CC       {ECO:0000256|ARBA:ARBA00002148}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=a ribonucleoside 5'-triphosphate + RNA(n) = diphosphate +
CC         RNA(n+1); Xref=Rhea:RHEA:21248, Rhea:RHEA-COMP:14527, Rhea:RHEA-
CC         COMP:17342, ChEBI:CHEBI:33019, ChEBI:CHEBI:61557, ChEBI:CHEBI:140395;
CC         EC=2.7.7.48; Evidence={ECO:0000256|HAMAP-Rule:MF_04065,
CC         ECO:0000256|RuleBase:RU004330};
CC   -!- SUBUNIT: Influenza RNA polymerase is composed of three subunits: PB1,
CC       PB2 and PA. Interacts (via N-terminus) with PA (via C-terminus).
CC       Interacts (via C-terminus) with PB2 (via N-terminus); this interaction
CC       is essential for transcription initiation. {ECO:0000256|HAMAP-
CC       Rule:MF_04065}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000256|ARBA:ARBA00004496}. Host
CC       nucleus {ECO:0000256|HAMAP-Rule:MF_04065}. Host cytoplasm
CC       {ECO:0000256|HAMAP-Rule:MF_04065}. Nucleus
CC       {ECO:0000256|ARBA:ARBA00004123}.
CC   -!- PTM: Phosphorylated by host PRKCA. {ECO:0000256|HAMAP-Rule:MF_04065}.
CC   -!- SIMILARITY: Belongs to the influenza viruses polymerase PB1 family.
CC       {ECO:0000256|HAMAP-Rule:MF_04065}.
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DR   EMBL; CY004232; ABB19225.1; -; Viral_cRNA.
DR   Proteomes; UP000117224; Genome.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
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:0000166; F:nucleotide binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0003723; F:RNA binding; IEA:InterPro.
DR   GO; GO:0003968; F:RNA-dependent RNA polymerase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0006351; P:DNA-templated transcription; 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:0039694; P:viral RNA genome replication; IEA:UniProtKB-UniRule.
DR   GO; GO:0019083; P:viral transcription; IEA:UniProtKB-KW.
DR   Gene3D; 6.10.140.720; -; 1.
DR   HAMAP; MF_04065; INFV_RDRP; 1.
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   3: Inferred from homology;
KW   Eukaryotic host gene expression shutoff by virus
KW   {ECO:0000256|ARBA:ARBA00023247, ECO:0000256|HAMAP-Rule:MF_04065};
KW   Eukaryotic host transcription shutoff by virus
KW   {ECO:0000256|ARBA:ARBA00022731, ECO:0000256|HAMAP-Rule:MF_04065};
KW   Host cytoplasm {ECO:0000256|ARBA:ARBA00023200, ECO:0000256|HAMAP-
KW   Rule:MF_04065};
KW   Host gene expression shutoff by virus {ECO:0000256|ARBA:ARBA00022995,
KW   ECO:0000256|HAMAP-Rule:MF_04065};
KW   Host nucleus {ECO:0000256|ARBA:ARBA00022562, ECO:0000256|HAMAP-
KW   Rule:MF_04065};
KW   Host-virus interaction {ECO:0000256|ARBA:ARBA00022581, ECO:0000256|HAMAP-
KW   Rule:MF_04065};
KW   Inhibition of host RNA polymerase II by virus
KW   {ECO:0000256|ARBA:ARBA00023103, ECO:0000256|HAMAP-Rule:MF_04065};
KW   Nucleotide-binding {ECO:0000256|ARBA:ARBA00022741, ECO:0000256|HAMAP-
KW   Rule:MF_04065};
KW   Nucleotidyltransferase {ECO:0000256|ARBA:ARBA00022695, ECO:0000256|HAMAP-
KW   Rule:MF_04065};
KW   Phosphoprotein {ECO:0000256|ARBA:ARBA00022553, ECO:0000256|HAMAP-
KW   Rule:MF_04065};
KW   RNA-directed RNA polymerase {ECO:0000256|ARBA:ARBA00022484,
KW   ECO:0000256|HAMAP-Rule:MF_04065};
KW   Transferase {ECO:0000256|HAMAP-Rule:MF_04065};
KW   Viral RNA replication {ECO:0000256|ARBA:ARBA00022953, ECO:0000256|HAMAP-
KW   Rule:MF_04065};
KW   Viral transcription {ECO:0000256|ARBA:ARBA00023314, ECO:0000256|HAMAP-
KW   Rule:MF_04065}.
FT   DOMAIN          286..483
FT                   /note="RdRp catalytic"
FT                   /evidence="ECO:0000259|PROSITE:PS50525"
FT   REGION          52..82
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          249..256
FT                   /note="Promoter-binding site"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_04065"
FT   MOTIF           187..195
FT                   /note="Nuclear localization signal"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_04065"
FT   MOTIF           203..216
FT                   /note="Nuclear localization signal"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_04065"
SQ   SEQUENCE   757 AA;  86468 MW;  017D5FF90FFF5BA4 CRC64;
     MDVNPTLLFL KVPAQNAIST TFPYTGDPPY SHGTGTGYTM DTVNRTHQYS EKGKWTTNTE
     TGAPQLNPID GPLPDDNEPS GYAQTDCVLE AMAFLEESHP GIFENSCLET MEVVQQTRVD
     KLTQGRQTYD WTLNRNQPAA TALANTIEVF RSNGLMANES GRLIDFLKDV MESMDKKEME
     ITTHFQRKRR VRDNMTKKMI TQRTIGKKKQ RLNKRSYLIR ALTLNTMTKD AERGKLKRRA
     IATPGMQIRG FVYFVETLAR SICEKLEQSG LPVGGNEKKA KLANVVRKMM TNSQDTELSF
     TITGDNTKWN ENQNPRMFLA MITYITRNQP EWFRNVLSIA PIMFSNKMAR LGKGYMFESK
     SMKLRTQIPA EMLANIDLKY FNESTRKKIE KIRPLLIDGT ASLSPGMMMG MFNMLSTVLG
     VSILNIGQKK YTKTTYWWDG LQSSDDFALI VNAPNHEGIQ AGVDRFYRTC KLVGINMSKK
     KSYINRTGTF EFTSFFYRYG FVANFSMELP SFGVSGINES ADMSIGVTVI KNNMINNDLG
     PATAQMALQL FIKDYRYTYR CHRGDTQIQT RRSFELKKLW EQTRSKAGLL VSDGGPNLYN
     IRNLHIPEVC LKWELMDEEY QGRLCNPLNP FVSHKEIESV NNAVVMPAHG PAKSMEYDAV
     ATTHSWIPKR NRSILNTSQR GILEDEQMYQ KCCNLFEKFF PSSSYRRPVG ISSMVEAMVS
     RARIDARIDF ESGRIKKEEF AEIMKICSTI EELRRQK
//
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