ID   PB1F2_I01A0             Reviewed;          90 AA.
AC   P0C5U6;
DT   13-NOV-2007, integrated into UniProtKB/Swiss-Prot.
DT   13-NOV-2007, sequence version 1.
DT   23-FEB-2022, entry version 51.
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/Silky Chicken/Hong Kong/SF189/2001 H5N1
OS   genotype A).
OC   Viruses; Riboviria; Orthornavirae; Negarnaviricota; Polyploviricotina;
OC   Insthoviricetes; Articulavirales; Orthomyxoviridae; Alphainfluenzavirus.
OX   NCBI_TaxID=196430;
OH   NCBI_TaxID=8782; Aves.
OH   NCBI_TaxID=9685; Felis catus (Cat) (Felis silvestris catus).
OH   NCBI_TaxID=9606; Homo sapiens (Human).
OH   NCBI_TaxID=9691; Panthera pardus (Leopard) (Felis pardus).
OH   NCBI_TaxID=9694; Panthera tigris (Tiger).
OH   NCBI_TaxID=9823; Sus scrofa (Pig).
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC RNA].
RX   PubMed=12077307; DOI=10.1073/pnas.132268999;
RA   Guan Y., Peiris J.S.M., Lipatov A.S., Ellis T.M., Dyrting K.C., Krauss S.,
RA   Zhang L.J., Webster R.G., Shortridge K.F.;
RT   "Emergence of multiple genotypes of H5N1 avian influenza viruses in Hong
RT   Kong SAR.";
RL   Proc. Natl. Acad. Sci. U.S.A. 99:8950-8955(2002).
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; AF509174; -; NOT_ANNOTATED_CDS; Genomic_DNA.
DR   SMR; P0C5U6; -.
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_0000311637"
FT   REGION          1..32
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
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;  10956 MW;  27A2230304F67760 CRC64;
     MEQEQDTPWT QSTEHINIQN RGNGQRTQRL EHPNSIRLMD HCLRIMSRVG MHRQIVYWKQ
     WLSLKSPTQG SLKTRVLKRW KLFSKQEWIN