ID   PETN_NOSS1              Reviewed;          29 AA.
AC   P61048; Q9L3P6;
DT   26-APR-2004, integrated into UniProtKB/Swiss-Prot.
DT   26-APR-2004, sequence version 1.
DT   25-MAY-2022, entry version 90.
DE   RecName: Full=Cytochrome b6-f complex subunit 8;
DE   AltName: Full=Cytochrome b6-f complex subunit PetN;
DE   AltName: Full=Cytochrome b6-f complex subunit VIII;
GN   Name=petN; OrderedLocusNames=asl4263;
OS   Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576).
OC   Bacteria; Cyanobacteria; Nostocales; Nostocaceae; Nostoc.
OX   NCBI_TaxID=103690;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RA   Arnold M.;
RT   "b6f complex of Anabaena sp.";
RL   Submitted (MAY-2001) to the EMBL/GenBank/DDBJ databases.
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PCC 7120 / SAG 25.82 / UTEX 2576;
RX   PubMed=11759840; DOI=10.1093/dnares/8.5.205;
RA   Kaneko T., Nakamura Y., Wolk C.P., Kuritz T., Sasamoto S., Watanabe A.,
RA   Iriguchi M., Ishikawa A., Kawashima K., Kimura T., Kishida Y., Kohara M.,
RA   Matsumoto M., Matsuno A., Muraki A., Nakazaki N., Shimpo S., Sugimoto M.,
RA   Takazawa M., Yamada M., Yasuda M., Tabata S.;
RT   "Complete genomic sequence of the filamentous nitrogen-fixing
RT   cyanobacterium Anabaena sp. strain PCC 7120.";
RL   DNA Res. 8:205-213(2001).
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:0000250}.
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 (By similarity). {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000250};
CC       Single-pass membrane protein {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the PetN family. {ECO:0000305}.
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DR   EMBL; AJ319652; CAC39612.1; -; Genomic_DNA.
DR   EMBL; BA000019; BAB75962.1; -; Genomic_DNA.
DR   PIR; AH2338; AH2338.
DR   RefSeq; WP_010998401.1; NZ_RSCN01000010.1.
DR   PDB; 2ZT9; X-ray; 3.00 A; H=1-29.
DR   PDB; 4H44; X-ray; 2.70 A; H=1-29.
DR   PDB; 4OGQ; X-ray; 2.50 A; H=1-29.
DR   PDBsum; 2ZT9; -.
DR   PDBsum; 4H44; -.
DR   PDBsum; 4OGQ; -.
DR   AlphaFoldDB; P61048; -.
DR   SMR; P61048; -.
DR   DIP; DIP-61007N; -.
DR   IntAct; P61048; 1.
DR   STRING; 103690.17133398; -.
DR   TCDB; 3.D.3.5.6; the proton-translocating quinol:cytochrome c reductase (qcr) superfamily.
DR   EnsemblBacteria; BAB75962; BAB75962; BAB75962.
DR   GeneID; 58723879; -.
DR   KEGG; ana:asl4263; -.
DR   EvolutionaryTrace; P61048; -.
DR   Proteomes; UP000002483; Chromosome.
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   1: Evidence at protein level;
KW   3D-structure; Electron transport; Membrane; Photosynthesis;
KW   Reference proteome; Thylakoid; Transmembrane; Transmembrane helix;
KW   Transport.
FT   CHAIN           1..29
FT                   /note="Cytochrome b6-f complex subunit 8"
FT                   /id="PRO_0000217134"
FT   TRANSMEM        3..23
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   HELIX           2..25
FT                   /evidence="ECO:0007829|PDB:4OGQ"
SQ   SEQUENCE   29 AA;  3234 MW;  1B2F8321392395BD CRC64;
     MAILTLGWVS LLVVFTWSIA MVVWGRNGL