ID   PETN_CYAP4              Reviewed;          29 AA.
AC   B8HSK6;
DT   28-JUL-2009, integrated into UniProtKB/Swiss-Prot.
DT   03-MAR-2009, sequence version 1.
DT   25-MAY-2022, entry version 49.
DE   RecName: Full=Cytochrome b6-f complex subunit 8 {ECO:0000255|HAMAP-Rule:MF_00395};
DE   AltName: Full=Cytochrome b6-f complex subunit PetN {ECO:0000255|HAMAP-Rule:MF_00395};
DE   AltName: Full=Cytochrome b6-f complex subunit VIII {ECO:0000255|HAMAP-Rule:MF_00395};
GN   Name=petN {ECO:0000255|HAMAP-Rule:MF_00395};
GN   OrderedLocusNames=Cyan7425_3669;
OS   Cyanothece sp. (strain PCC 7425 / ATCC 29141).
OC   Bacteria; Cyanobacteria; Oscillatoriophycideae; Oscillatoriales;
OC   Cyanothecaceae; Cyanothece; unclassified Cyanothece.
OX   NCBI_TaxID=395961;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PCC 7425 / ATCC 29141;
RX   PubMed=21972240; DOI=10.1128/mbio.00214-11;
RA   Bandyopadhyay A., Elvitigala T., Welsh E., Stockel J., Liberton M., Min H.,
RA   Sherman L.A., Pakrasi H.B.;
RT   "Novel metabolic attributes of the genus Cyanothece, comprising a group of
RT   unicellular nitrogen-fixing Cyanobacteria.";
RL   MBio 2:E214-E214(2011).
CC   -!- FUNCTION: Component of the cytochrome b6-f complex, which mediates
CC       electron transfer between photosystem II (PSII) and photosystem I
CC       (PSI), cyclic electron flow around PSI, and state transitions.
CC       {ECO:0000255|HAMAP-Rule:MF_00395}.
CC   -!- SUBUNIT: The 4 large subunits of the cytochrome b6-f complex are
CC       cytochrome b6, subunit IV (17 kDa polypeptide, PetD), cytochrome f and
CC       the Rieske protein, while the 4 small subunits are PetG, PetL, PetM and
CC       PetN. The complex functions as a dimer. {ECO:0000255|HAMAP-
CC       Rule:MF_00395}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP-
CC       Rule:MF_00395}; Single-pass membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_00395}.
CC   -!- SIMILARITY: Belongs to the PetN family. {ECO:0000255|HAMAP-
CC       Rule:MF_00395}.
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DR   EMBL; CP001344; ACL45989.1; -; Genomic_DNA.
DR   RefSeq; WP_012629047.1; NC_011884.1.
DR   AlphaFoldDB; B8HSK6; -.
DR   SMR; B8HSK6; -.
DR   STRING; 395961.Cyan7425_3669; -.
DR   EnsemblBacteria; ACL45989; ACL45989; Cyan7425_3669.
DR   KEGG; cyn:Cyan7425_3669; -.
DR   HOGENOM; CLU_215774_1_0_3; -.
DR   GO; GO:0009512; C:cytochrome b6f complex; IEA:InterPro.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0031676; C:plasma membrane-derived thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0045158; F:electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity; IEA:InterPro.
DR   GO; GO:0017004; P:cytochrome complex assembly; IEA:UniProtKB-UniRule.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-KW.
DR   HAMAP; MF_00395; Cytb6_f_PetN; 1.
DR   InterPro; IPR036143; Cytochr_b6-f_cplx_su8_sf.
DR   InterPro; IPR005497; Cytochrome_b6-f_cplx_su8.
DR   Pfam; PF03742; PetN; 1.
DR   SUPFAM; SSF103451; SSF103451; 1.
PE   3: Inferred from homology;
KW   Electron transport; Membrane; Photosynthesis; Thylakoid; Transmembrane;
KW   Transmembrane helix; Transport.
FT   CHAIN           1..29
FT                   /note="Cytochrome b6-f complex subunit 8"
FT                   /id="PRO_1000192356"
FT   TRANSMEM        3..23
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00395"
SQ   SEQUENCE   29 AA;  3238 MW;  9C93F69EBE0095A1 CRC64;
     MDILTLGWVG LLGLFTYSIA MVVWGRHGM