ID   PETN_GRATL              Reviewed;          30 AA.
AC   Q6B8U0;
DT   21-JUN-2005, integrated into UniProtKB/Swiss-Prot.
DT   06-FEB-2007, sequence version 2.
DT   25-MAY-2022, entry version 61.
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}; OrderedLocusNames=Grc000114;
OS   Gracilaria tenuistipitata var. liui (Red alga).
OG   Plastid; Chloroplast.
OC   Eukaryota; Rhodophyta; Florideophyceae; Rhodymeniophycidae; Gracilariales;
OC   Gracilariaceae; Agarophyton; Agarophyton tenuistipitatum.
OX   NCBI_TaxID=285951;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RX   PubMed=15638458; DOI=10.1007/s00239-004-2638-3;
RA   Hagopian J.C., Reis M., Kitajima J.P., Bhattacharya D., de Oliveira M.C.;
RT   "Comparative analysis of the complete plastid genome sequence of the red
RT   alga Gracilaria tenuistipitata var. liui provides insights into the
RT   evolution of rhodoplasts and their relationship to other plastids.";
RL   J. Mol. Evol. 59:464-477(2004).
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: Plastid, chloroplast thylakoid membrane
CC       {ECO:0000255|HAMAP-Rule:MF_00395}; Single-pass membrane protein
CC       {ECO:0000255|HAMAP-Rule:MF_00395}.
CC   -!- SIMILARITY: Belongs to the PetN family. {ECO:0000255|HAMAP-
CC       Rule:MF_00395}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=AAT79695.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR   EMBL; AY673996; AAT79695.1; ALT_INIT; Genomic_DNA.
DR   RefSeq; YP_063620.1; NC_006137.1.
DR   AlphaFoldDB; Q6B8U0; -.
DR   SMR; Q6B8U0; -.
DR   GeneID; 2943951; -.
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   3: Inferred from homology;
KW   Chloroplast; Electron transport; Membrane; Photosynthesis; Plastid;
KW   Thylakoid; Transmembrane; Transmembrane helix; Transport.
FT   CHAIN           1..30
FT                   /note="Cytochrome b6-f complex subunit 8"
FT                   /id="PRO_0000217108"
FT   TRANSMEM        4..24
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00395"
SQ   SEQUENCE   30 AA;  3284 MW;  E798F4716150FB38 CRC64;
     MLDIISLGWG SLLAIFSFSI ALVVWGRNGF