ID C3VZR5_9CONI Unreviewed; 215 AA. AC C3VZR5; DT 16-JUN-2009, integrated into UniProtKB/TrEMBL. DT 16-JUN-2009, sequence version 1. DT 05-APR-2011, entry version 11. DE RecName: Full=Cytochrome b6; GN Name=petB; ORFNames=PLC-449; OS Pinus aristata. OG Plastid; Chloroplast. OC Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta; OC Spermatophyta; Coniferopsida; Coniferales; Pinaceae; Pinus; Strobus. OX NCBI_TaxID=71623; RN [1] RP NUCLEOTIDE SEQUENCE. RC STRAIN=ARIS02; RX PubMed=19954512; DOI=10.1186/1741-7007-7-84; RA Parks M., Cronn R., Liston A.; RT "Increasing phylogenetic resolution at low taxonomic levels using RT massively parallel sequencing of chloroplast genomes."; RL BMC Biol. 7:84-84(2009). RN [2] RP NUCLEOTIDE SEQUENCE. RC STRAIN=ARIS02; RA Parks M.B., Liston A., Cronn R.C.; RL Submitted (APR-2009) to the EMBL/GenBank/DDBJ databases. 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 (By 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 -!- 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 thylakoid membrane; CC 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; FJ899567; ACP51541.1; -; Genomic_DNA. DR GO; GO:0009535; C:chloroplast thylakoid membrane; IEA:UniProtKB-SubCell. DR GO; GO:0016021; C:integral to membrane; IEA:UniProtKB-KW. DR GO; GO:0045158; F:electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity; IEA:HAMAP. DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW. DR GO; GO:0016491; F:oxidoreductase activity; IEA:InterPro. DR GO; GO:0015979; P:photosynthesis; IEA:HAMAP. DR GO; GO:0022904; P:respiratory electron transport chain; IEA:InterPro. DR GO; GO:0006810; P:transport; IEA:UniProtKB-KW. DR HAMAP; MF_00633; Cytb6_f_cytb6; 1; -. DR InterPro; IPR016175; Cyt_b/b6. DR InterPro; IPR005797; Cyt_b/b6_N. DR InterPro; IPR023530; Cyt_B6_PetB. DR InterPro; IPR016174; Di-haem_cyt_TM. DR Gene3D; G3DSA:1.20.810.10; Cytochrome_b/b6; 1. DR PANTHER; PTHR19271; Cytochrome_b/b6; 1. DR Pfam; PF00033; Cytochrom_B_N; 1. DR SUPFAM; SSF81342; Transmembr_di-haem_cytochrome; 1. DR PROSITE; PS51002; CYTB_NTER; 1. PE 3: Inferred from homology; KW Chloroplast; Electron transport; Heme; Iron; Membrane; Metal-binding; KW Photosynthesis; Plastid; Thylakoid; Transmembrane; KW Transmembrane helix; Transport. FT TRANSMEM 32 52 Helical; (By similarity). FT TRANSMEM 90 110 Helical; (By similarity). FT TRANSMEM 116 136 Helical; (By similarity). FT TRANSMEM 186 206 Helical; (By similarity). 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; 24261 MW; E696F7DD72DB3DDD CRC64; MGKVYDWFEE RLEIQAIADD ITSKYVPPHV NIFYCLGGIT LTCFLVQVAT GFAMTFYYRP TVTEAFASVQ YLMTEVNFGW LIRSIHRWSA SMMVLMMILH VFRVYLTGGF KKPRELTWVT GVILAVLTVS FGVTGYSLPW DQIGYWAVKI VTGVPEAIPV IGSPLVELLR GSVSVGQSTL TRFYSLHTFI LPLLTAVFMP MHFLMIRKQG ISGPL //