ID   PB1F2_I66A0             Reviewed;          90 AA.
AC   Q0A2D8;
DT   20-FEB-2007, integrated into UniProtKB/Swiss-Prot.
DT   17-OCT-2006, sequence version 1.
DT   23-FEB-2022, entry version 53.
DE   RecName: Full=Protein PB1-F2 {ECO:0000255|HAMAP-Rule:MF_04064};
GN   Name=PB1 {ECO:0000255|HAMAP-Rule:MF_04064};
OS   Influenza A virus (strain A/Turkey/Ontario/7732/1966 H5N9).
OC   Viruses; Riboviria; Orthornavirae; Negarnaviricota; Polyploviricotina;
OC   Insthoviricetes; Articulavirales; Orthomyxoviridae; Alphainfluenzavirus.
OX   NCBI_TaxID=380301;
OH   NCBI_TaxID=8782; Aves.
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC RNA].
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: Plays an important role in promoting lung pathology in both
CC       primary viral infection and secondary bacterial infection. Promotes
CC       alteration of mitochondrial morphology, dissipation of mitochondrial
CC       membrane potential, and cell death. Alternatively, inhibits the
CC       production of interferon in the infected cell at the level of host
CC       mitochondrial antiviral signaling MAVS. Its level of expression differs
CC       greatly depending on which cell type is infected, in a manner that is
CC       independent of the levels of expression of other viral proteins.
CC       Monocytic cells are more affected than epithelial cells. Seems to
CC       disable virus-infected monocytes or other host innate immune cells.
CC       During early stage of infection, predisposes the mitochondria to
CC       permeability transition through interaction with host SLC25A6/ANT3 and
CC       VDAC1. These proteins participate in the formation of the permeability
CC       transition pore complex (PTPC) responsible of the release of
CC       mitochondrial products that triggers apoptosis. {ECO:0000255|HAMAP-
CC       Rule:MF_04064}.
CC   -!- SUBUNIT: Oligomer. Interacts with human SLC25A6/ANT3 and VDAC1.
CC       Interacts with host MAVS. {ECO:0000255|HAMAP-Rule:MF_04064}.
CC   -!- SUBCELLULAR LOCATION: Host mitochondrion inner membrane
CC       {ECO:0000255|HAMAP-Rule:MF_04064}. Host nucleus {ECO:0000255|HAMAP-
CC       Rule:MF_04064}. Host cytoplasm, host cytosol {ECO:0000255|HAMAP-
CC       Rule:MF_04064}. Note=Inner mitochondrial membrane in most cells types.
CC       Otherwise is detected in the nucleus and cytosol. {ECO:0000255|HAMAP-
CC       Rule:MF_04064}.
CC   -!- MISCELLANEOUS: Is not encoded in all strains, and seems to be
CC       dispensable for replication.
CC   -!- SIMILARITY: Belongs to the influenza viruses PB1-F2 family.
CC       {ECO:0000255|HAMAP-Rule:MF_04064}.
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DR   EMBL; CY015107; ABI85144.1; -; Genomic_RNA.
DR   SMR; Q0A2D8; -.
DR   GO; GO:0044164; C:host cell cytosol; IEA:UniProtKB-SubCell.
DR   GO; GO:0044192; C:host cell mitochondrial inner membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0042025; C:host cell nucleus; IEA:UniProtKB-SubCell.
DR   GO; GO:0016020; C:membrane; IEA:UniProtKB-UniRule.
DR   GO; GO:0039526; P:modulation by virus of host apoptotic process; IEA:UniProtKB-KW.
DR   GO; GO:0039545; P:suppression by virus of host viral-induced cytoplasmic pattern recognition receptor signaling pathway via inhibition of MAVS activity; IEA:UniProtKB-KW.
DR   HAMAP; MF_04064; INFV_PB1F2; 1.
DR   InterPro; IPR021045; Flu_proapoptotic_PB1-F2.
DR   Pfam; PF11986; PB1-F2; 1.
PE   3: Inferred from homology;
KW   Apoptosis; Host cytoplasm; Host membrane; Host mitochondrion;
KW   Host mitochondrion inner membrane; Host nucleus; Host-virus interaction;
KW   Inhibition of host innate immune response by virus;
KW   Inhibition of host MAVS by virus; Inhibition of host RLR pathway by virus;
KW   Membrane; Modulation of host cell apoptosis by virus; Viral immunoevasion.
FT   CHAIN           1..90
FT                   /note="Protein PB1-F2"
FT                   /id="PRO_0000278725"
FT   REGION          65..87
FT                   /note="Mitochondrial targeting sequence"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04064"
FT   SITE            66
FT                   /note="High pathogenicity"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04064"
SQ   SEQUENCE   90 AA;  10818 MW;  4A0AD8D49A2AD727 CRC64;
     MEQEQDTPWI QSTGHINIQK RENGQQTLKL EHHNSIQLMD HCPKTMNRAV MLKQTVCWRQ
     WLFLRSPTPV SLKTHVLRRW KSFSKHGWTN