ID   PETN_VOLCA              Reviewed;          98 AA.
AC   Q9SBM8;
DT   16-MAY-2006, integrated into UniProtKB/Swiss-Prot.
DT   01-MAY-2000, sequence version 1.
DT   25-MAY-2022, entry version 62.
DE   RecName: Full=Cytochrome b6-f complex subunit 8, chloroplastic;
DE   AltName: Full=Cytochrome b6-f complex subunit PetN;
DE   AltName: Full=Cytochrome b6-f complex subunit VIII;
DE   Flags: Precursor;
GN   Name=PETN;
OS   Volvox carteri (Green alga).
OC   Eukaryota; Viridiplantae; Chlorophyta; core chlorophytes; Chlorophyceae;
OC   CS clade; Chlamydomonadales; Volvocaceae; Volvox.
OX   NCBI_TaxID=3067;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RC   STRAIN=f. Nagariensis;
RX   PubMed=10654090; DOI=10.1007/s002940050511;
RA   Meissner M., Stark K., Cresnar B., Kirk D.L., Schmitt R.;
RT   "Volvox germline-specific genes that are putative targets of RegA
RT   repression encode chloroplast proteins.";
RL   Curr. Genet. 36:363-370(1999).
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   -!- MISCELLANEOUS: Unlike its orthologs this protein is not encoded in the
CC       chloroplast.
CC   -!- SIMILARITY: Belongs to the PetN family. {ECO:0000305}.
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DR   EMBL; AF110788; AAD55570.1; -; mRNA.
DR   RefSeq; XP_002952299.1; XM_002952253.1.
DR   AlphaFoldDB; Q9SBM8; -.
DR   SMR; Q9SBM8; -.
DR   GeneID; 9628476; -.
DR   KEGG; vcn:VOLCADRAFT_105437; -.
DR   OMA; IGWAATC; -.
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:InterPro.
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; Transit peptide; Transmembrane; Transmembrane helix; Transport.
FT   TRANSIT         1..67
FT                   /note="Chloroplast"
FT                   /evidence="ECO:0000255"
FT   CHAIN           68..98
FT                   /note="Cytochrome b6-f complex subunit 8, chloroplastic"
FT                   /id="PRO_0000235306"
FT   TRANSMEM        72..92
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   98 AA;  10067 MW;  E32DA468059845DB CRC64;
     MQCVSRVAQR SAVSRPRVAS RQAVKVQAVK PAEQKAAMAA VAATASTLAL ALAPAAQAAQ
     EVAMLAEGEP AIVQIGWAAT CVMFSFSLSL VVWGRSGL