ID   CYB6_CHAGL     STANDARD;      PRT;   215 AA.
AC   Q8M9Z4;
DT   11-APR-2003, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-2002, sequence version 1.
DT   25-JUL-2006, entry version 28.
DE   Cytochrome b6.
GN   Name=petB;
OS   Chaetosphaeridium globosum.
OG   Plastid; Chloroplast.
OC   Eukaryota; Viridiplantae; Streptophyta; Coleochaetophyceae;
OC   Coleochaetales; Chaetosphaeridiaceae; Chaetosphaeridium.
OX   NCBI_TaxID=96477;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=M1311;
RX   MEDLINE=22177139; PubMed=12161560; DOI=10.1073/pnas.162203299;
RA   Turmel M., Otis C., Lemieux C.;
RT   "The chloroplast and mitochondrial genome sequences of the charophyte
RT   Chaetosphaeridium globosum: insights into the timing of the events
RT   that restructured organelle DNAs within the green algal lineage that
RT   led to land plants.";
RL   Proc. Natl. Acad. Sci. U.S.A. 99:11275-11280(2002).
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 (By
CC       similarity).
CC   -!- COFACTOR: Binds 2 heme groups. One heme group is bound covalently
CC       by a single cysteine link, the other one non-covalently (By
CC       similarity).
CC   -!- SUBUNIT: The 4 large subunits of the cytochrome b6-f complex are
CC       cytochrome b6, subunit IV (17 kDa polypeptide, petD), cytochrome f
CC       and the Rieske protein, while the 4 small subunits are petG, petL,
CC       petM and petN. The complex functions as a dimer (By similarity).
CC   -!- SUBCELLULAR LOCATION: Plastid; chloroplast; chloroplast thylakoid
CC       membrane; multi-pass membrane protein (By similarity).
CC   -!- MISCELLANEOUS: Heme 1 (or BH or b566) is high-potential and
CC       absorbs at about 566 nm, and heme 2 (or BL or b562) is low-
CC       potential and absorbs at about 562 nm (By similarity).
CC   -!- SIMILARITY: Belongs to the cytochrome b family. PetB subfamily.
CC   ---------------------------------------------------------------------------
CC   Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC   Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC   ---------------------------------------------------------------------------
DR   EMBL; AF494278; AAM96527.1; -; Genomic_DNA.
DR   SMR; Q8M9Z4; 4-215.
DR   HAMAP; MF_00633; -; 1.
DR   InterPro; IPR005797; Cytb_b6_N.
DR   InterPro; IPR012232; Cytochrome_b6.
DR   Pfam; PF00033; Cytochrom_B_N; 1.
DR   PIRSF; PIRSF000032; Cytochrome_b6; 1.
DR   PROSITE; PS51002; CYTB_NTER; 1.
KW   Chloroplast; Electron transport; Heme; Iron; Membrane; Metal-binding;
KW   Photosynthesis; Plastid; Thylakoid; Transmembrane; Transport.
FT   CHAIN         1    215       Cytochrome b6.
FT                                /FTId=PRO_0000061785.
FT   TRANSMEM     32     52       Potential.
FT   TRANSMEM     90    110       Potential.
FT   TRANSMEM    116    136       Potential.
FT   TRANSMEM    186    206       Potential.
FT   METAL        86     86       Iron (heme 2 axial ligand) (By
FT                                similarity).
FT   METAL       100    100       Iron (heme 1 axial ligand) (By
FT                                similarity).
FT   METAL       187    187       Iron (heme 2 axial ligand) (By
FT                                similarity).
FT   METAL       202    202       Iron (heme 1 axial ligand) (By
FT                                similarity).
FT   BINDING      35     35       Heme 1 (covalent; via 1 link) (By
FT                                similarity).
SQ   SEQUENCE   215 AA;  24231 MW;  2879F90589E0DDFA CRC64;
     MGKVYDWFEE RLEIQAIADD ISSKYVPPHV NIFYCLGGIT FTSFVIQVAS GFAMTFYYRP
     TVTEAFASVQ YIMTEVNFGW LIRSVHRWSA SMMVLMMILH IFRVYLTGGF KKPRELTWVT
     GVILSVLTVS FGVTGYSLPW DQVGYWAVKI VTGVPDAIPV IGSTVVELLR GSVSVGQSTL
     TRFYSLHTFV LPLLTAVFML MHFLMIRKQG ISGPL
//