ID   PETN_SPIOL              Reviewed;          29 AA.
AC   P61045; P12178; P56789;
DT   26-APR-2004, integrated into UniProtKB/Swiss-Prot.
DT   26-APR-2004, sequence version 1.
DT   25-MAY-2022, entry version 68.
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; Synonyms=ycf6;
OS   Spinacia oleracea (Spinach).
OG   Plastid; Chloroplast.
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   Caryophyllales; Chenopodiaceae; Chenopodioideae; Anserineae; Spinacia.
OX   NCBI_TaxID=3562;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=cv. Geant d'hiver, and cv. Monatol;
RX   PubMed=11292076; DOI=10.1023/a:1006478403810;
RA   Schmitz-Linneweber C., Maier R.M., Alcaraz J.-P., Cottet A., Herrmann R.G.,
RA   Mache R.;
RT   "The plastid chromosome of spinach (Spinacia oleracea): complete nucleotide
RT   sequence and gene organization.";
RL   Plant Mol. Biol. 45:307-315(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: Plastid, chloroplast thylakoid membrane
CC       {ECO:0000250}; Single-pass membrane protein {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the PetN family. {ECO:0000305}.
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DR   EMBL; AJ400848; CAB88718.1; -; Genomic_DNA.
DR   RefSeq; NP_054925.1; NC_002202.1.
DR   PDB; 6RQF; EM; 3.58 A; H/P=1-29.
DR   PDBsum; 6RQF; -.
DR   AlphaFoldDB; P61045; -.
DR   SMR; P61045; -.
DR   IntAct; P61045; 1.
DR   GeneID; 2715693; -.
DR   KEGG; soe:2715693; -.
DR   Proteomes; UP000054095; Chloroplast.
DR   GO; GO:0009535; C:chloroplast thylakoid membrane; IEA:UniProtKB-SubCell.
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: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; Chloroplast; Electron transport; Membrane; Photosynthesis;
KW   Plastid; Reference proteome; Thylakoid; Transmembrane; Transmembrane helix;
KW   Transport.
FT   CHAIN           1..29
FT                   /note="Cytochrome b6-f complex subunit 8"
FT                   /id="PRO_0000217131"
FT   TRANSMEM        3..23
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   29 AA;  3170 MW;  2B1641516534C166 CRC64;
     MDIVSLAWAA LMVVFTFSLS LVVWGRSGL