CYB6_CHLTE
ID CYB6_CHLTE Reviewed; 428 AA.
AC Q9F721;
DT 27-APR-2001, integrated into UniProtKB/Swiss-Prot.
DT 23-JAN-2007, sequence version 3.
DT 03-AUG-2022, entry version 126.
DE RecName: Full=Cytochrome bc complex cytochrome b subunit;
GN Name=petB; OrderedLocusNames=CT0303;
OS Chlorobaculum tepidum (strain ATCC 49652 / DSM 12025 / NBRC 103806 / TLS)
OS (Chlorobium tepidum).
OC Bacteria; Chlorobi; Chlorobia; Chlorobiales; Chlorobiaceae; Chlorobaculum.
OX NCBI_TaxID=194439;
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC STRAIN=ATCC 49652 / DSM 12025 / NBRC 103806 / TLS;
RX PubMed=10976061; DOI=10.1126/science.289.5485.1724;
RA Xiong J., Fischer W.M., Inoue K., Nakahara M., Bauer C.E.;
RT "Molecular evidence for the early evolution of photosynthesis.";
RL Science 289:1724-1730(2000).
RN [2]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC 49652 / DSM 12025 / NBRC 103806 / TLS;
RX PubMed=12093901; DOI=10.1073/pnas.132181499;
RA Eisen J.A., Nelson K.E., Paulsen I.T., Heidelberg J.F., Wu M., Dodson R.J.,
RA DeBoy R.T., Gwinn M.L., Nelson W.C., Haft D.H., Hickey E.K., Peterson J.D.,
RA Durkin A.S., Kolonay J.F., Yang F., Holt I.E., Umayam L.A., Mason T.M.,
RA Brenner M., Shea T.P., Parksey D.S., Nierman W.C., Feldblyum T.V.,
RA Hansen C.L., Craven M.B., Radune D., Vamathevan J.J., Khouri H.M.,
RA White O., Gruber T.M., Ketchum K.A., Venter J.C., Tettelin H., Bryant D.A.,
RA Fraser C.M.;
RT "The complete genome sequence of Chlorobium tepidum TLS, a photosynthetic,
RT anaerobic, green-sulfur bacterium.";
RL Proc. Natl. Acad. Sci. U.S.A. 99:9509-9514(2002).
CC -!- FUNCTION: Component of the green S-bacteria bc complex, which consists
CC of the Rieske protein and cytochrome b subunit but appears to lack a
CC cytochrome c1-equivalent. This complex has a comparatively low redox
CC potential (By similarity). {ECO:0000250}.
CC -!- COFACTOR:
CC Name=heme b; Xref=ChEBI:CHEBI:60344; Evidence={ECO:0000250};
CC Note=Binds 2 heme b groups non-covalently. {ECO:0000250};
CC -!- SUBCELLULAR LOCATION: Cell inner membrane {ECO:0000305}; Multi-pass
CC membrane protein {ECO:0000305}.
CC -!- MISCELLANEOUS: Heme 1 (or BL or b562) is low-potential and absorbs at
CC about 562 nm, and heme 2 (or BH or b566) is high-potential and absorbs
CC at about 566 nm. {ECO:0000250}.
CC -!- SIMILARITY: Belongs to the cytochrome b family. {ECO:0000255|PROSITE-
CC ProRule:PRU00967, ECO:0000255|PROSITE-ProRule:PRU00968}.
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DR EMBL; AF287480; AAG12195.1; -; Genomic_DNA.
DR EMBL; AE006470; AAM71549.1; -; Genomic_DNA.
DR RefSeq; NP_661207.1; NC_002932.3.
DR RefSeq; WP_010931995.1; NC_002932.3.
DR AlphaFoldDB; Q9F721; -.
DR SMR; Q9F721; -.
DR STRING; 194439.CT0303; -.
DR EnsemblBacteria; AAM71549; AAM71549; CT0303.
DR KEGG; cte:CT0303; -.
DR PATRIC; fig|194439.7.peg.293; -.
DR eggNOG; COG1290; Bacteria.
DR HOGENOM; CLU_031114_4_0_10; -.
DR OMA; RFFAFHF; -.
DR OrthoDB; 262439at2; -.
DR Proteomes; UP000001007; Chromosome.
DR GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR GO; GO:0005886; C:plasma membrane; IEA:UniProtKB-SubCell.
DR GO; GO:0070469; C:respirasome; IEA:UniProtKB-KW.
DR GO; GO:0009055; F:electron transfer activity; IEA:InterPro.
DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR GO; GO:0022904; P:respiratory electron transport chain; IEA:InterPro.
DR CDD; cd00284; Cytochrome_b_N; 1.
DR Gene3D; 1.20.810.10; -; 1.
DR InterPro; IPR005798; Cyt_b/b6_C.
DR InterPro; IPR036150; Cyt_b/b6_C_sf.
DR InterPro; IPR005797; Cyt_b/b6_N.
DR InterPro; IPR027387; Cytb/b6-like_sf.
DR InterPro; IPR016174; Di-haem_cyt_TM.
DR Pfam; PF00032; Cytochrom_B_C; 1.
DR Pfam; PF00033; Cytochrome_B; 1.
DR SUPFAM; SSF81342; SSF81342; 1.
DR SUPFAM; SSF81648; SSF81648; 1.
DR PROSITE; PS51003; CYTB_CTER; 1.
DR PROSITE; PS51002; CYTB_NTER; 1.
PE 3: Inferred from homology;
KW Cell inner membrane; Cell membrane; Electron transport; Heme; Iron;
KW Membrane; Metal-binding; Reference proteome; Respiratory chain;
KW Transmembrane; Transmembrane helix; Transport.
FT INIT_MET 1
FT /note="Removed"
FT /evidence="ECO:0000250"
FT CHAIN 2..428
FT /note="Cytochrome bc complex cytochrome b subunit"
FT /id="PRO_0000061917"
FT TRANSMEM 108..128
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 160..180
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 191..211
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 258..278
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 310..329
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 367..387
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 399..419
FT /note="Helical"
FT /evidence="ECO:0000255"
FT REGION 1..67
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT BINDING 159
FT /ligand="heme b"
FT /ligand_id="ChEBI:CHEBI:60344"
FT /ligand_label="b562"
FT /ligand_part="Fe"
FT /ligand_part_id="ChEBI:CHEBI:18248"
FT /note="axial binding residue"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00968"
FT BINDING 173
FT /ligand="heme b"
FT /ligand_id="ChEBI:CHEBI:60344"
FT /ligand_label="b566"
FT /ligand_part="Fe"
FT /ligand_part_id="ChEBI:CHEBI:18248"
FT /note="axial binding residue"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00968"
FT BINDING 259
FT /ligand="heme b"
FT /ligand_id="ChEBI:CHEBI:60344"
FT /ligand_label="b562"
FT /ligand_part="Fe"
FT /ligand_part_id="ChEBI:CHEBI:18248"
FT /note="axial binding residue"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00968"
FT BINDING 274
FT /ligand="heme b"
FT /ligand_id="ChEBI:CHEBI:60344"
FT /ligand_label="b566"
FT /ligand_part="Fe"
FT /ligand_part_id="ChEBI:CHEBI:18248"
FT /note="axial binding residue"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00968"
SQ SEQUENCE 428 AA; 47495 MW; CA63747E6A132595 CRC64;
MAENTQNPAA GTAPAKPKPA VPGAAKPAAP GAAKPAAKAP AKPAAPAATA PSGVYKPPVD
RPDPNPFKDS KMSGVASWFQ ERFYVLNPII DYMKHKEVPK HRLSFWYYFG GLGLFFFIIQ
ILTGLLLLQY YKPTETDAFS SFLFIQGQVP FGWLIRQIHA WSANLMILML FIHMFSTFFM
KSYRKPRELL WVSGFILLVL TLGFGFTGYL LPWNELAFFA TQVGTEVPKV APGGAFLVEI
LRGGPDVSGE TLTRMFSLHV VLLPGLVMLV LAAHLTLVQV LGTSAPIGYK EAGLIKGYDK
FFPTFLAKDG IGWLIGFALL VYLAVMFPWE IGVKANPLSP APVGIKPEWY FWAQFQLLKD
FKFEGGELLA IILFTIGGVV WMLVPFLDRQ ASQEKKSPMF TIFGLLVLAF LLINTYRVYD
SYVLHLPK
