ID A0A437QMW6_9PROT Unreviewed; 424 AA.
AC A0A437QMW6;
DT 08-MAY-2019, integrated into UniProtKB/TrEMBL.
DT 08-MAY-2019, sequence version 1.
DT 27-MAR-2024, entry version 16.
DE RecName: Full=Cytochrome b {ECO:0000256|ARBA:ARBA00013531, ECO:0000256|RuleBase:RU003385};
GN ORFNames=EOI86_11495 {ECO:0000313|EMBL:RVU35878.1};
OS Hwanghaeella grinnelliae.
OC Bacteria; Pseudomonadota; Alphaproteobacteria; Rhodospirillales;
OC Rhodospirillaceae; Hwanghaeella.
OX NCBI_TaxID=2500179 {ECO:0000313|EMBL:RVU35878.1, ECO:0000313|Proteomes:UP000287447};
RN [1] {ECO:0000313|Proteomes:UP000287447}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=Gri0909 {ECO:0000313|Proteomes:UP000287447};
RA Kim J., Jeong S.E., Jeon C.O.;
RT "Gri0909 isolated from a small marine red alga.";
RL Submitted (JAN-2019) to the EMBL/GenBank/DDBJ databases.
CC -!- FUNCTION: Component of the ubiquinol-cytochrome c reductase complex
CC (complex III or cytochrome b-c1 complex), which is a respiratory chain
CC that generates an electrochemical potential coupled to ATP synthesis.
CC {ECO:0000256|ARBA:ARBA00002444, ECO:0000256|RuleBase:RU003385}.
CC -!- COFACTOR:
CC Name=heme b; Xref=ChEBI:CHEBI:60344;
CC Evidence={ECO:0000256|RuleBase:RU003385};
CC Note=Binds 2 heme groups non-covalently.
CC {ECO:0000256|RuleBase:RU003385};
CC -!- COFACTOR:
CC Name=heme; Xref=ChEBI:CHEBI:30413;
CC Evidence={ECO:0000256|PIRSR:PIRSR038885-2};
CC Note=Binds 2 heme groups non-covalently.
CC {ECO:0000256|PIRSR:PIRSR038885-2};
CC -!- SUBUNIT: The main subunits of complex b-c1 are: cytochrome b,
CC cytochrome c1 and the Rieske protein. {ECO:0000256|ARBA:ARBA00011649,
CC ECO:0000256|RuleBase:RU003385}.
CC -!- SUBCELLULAR LOCATION: Membrane {ECO:0000256|ARBA:ARBA00004141}; Multi-
CC pass membrane protein {ECO:0000256|ARBA:ARBA00004141}.
CC -!- SIMILARITY: Belongs to the cytochrome b family.
CC {ECO:0000256|RuleBase:RU003385}.
CC -!- CAUTION: The sequence shown here is derived from an EMBL/GenBank/DDBJ
CC whole genome shotgun (WGS) entry which is preliminary data.
CC {ECO:0000313|EMBL:RVU35878.1}.
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DR EMBL; SADE01000002; RVU35878.1; -; Genomic_DNA.
DR AlphaFoldDB; A0A437QMW6; -.
DR OrthoDB; 9804503at2; -.
DR Proteomes; UP000287447; Unassembled WGS sequence.
DR GO; GO:0045275; C:respiratory chain complex III; IEA:InterPro.
DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR GO; GO:0008121; F:ubiquinol-cytochrome-c reductase activity; IEA:InterPro.
DR GO; GO:0022904; P:respiratory electron transport chain; IEA:InterPro.
DR CDD; cd00290; cytochrome_b_C; 1.
DR CDD; cd00284; Cytochrome_b_N; 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; IPR030689; Cytochrome_b.
DR InterPro; IPR048260; Cytochrome_b_C_euk/bac.
DR InterPro; IPR048259; Cytochrome_b_N_euk/bac.
DR InterPro; IPR016174; Di-haem_cyt_TM.
DR PANTHER; PTHR19271; CYTOCHROME B; 1.
DR PANTHER; PTHR19271:SF16; CYTOCHROME B; 1.
DR Pfam; PF00032; Cytochrom_B_C; 1.
DR Pfam; PF00033; Cytochrome_B; 1.
DR PIRSF; PIRSF038885; COB; 1.
DR SUPFAM; SSF81648; a domain/subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase); 1.
DR SUPFAM; SSF81342; Transmembrane di-heme cytochromes; 1.
DR PROSITE; PS51003; CYTB_CTER; 1.
DR PROSITE; PS51002; CYTB_NTER; 1.
PE 3: Inferred from homology;
KW Electron transport {ECO:0000256|ARBA:ARBA00022982,
KW ECO:0000256|RuleBase:RU003385};
KW Heme {ECO:0000256|ARBA:ARBA00022617, ECO:0000256|PIRSR:PIRSR038885-2};
KW Iron {ECO:0000256|ARBA:ARBA00023004, ECO:0000256|PIRSR:PIRSR038885-2};
KW Membrane {ECO:0000256|ARBA:ARBA00023136, ECO:0000256|SAM:Phobius};
KW Metal-binding {ECO:0000256|ARBA:ARBA00022723,
KW ECO:0000256|PIRSR:PIRSR038885-2};
KW Reference proteome {ECO:0000313|Proteomes:UP000287447};
KW Respiratory chain {ECO:0000256|ARBA:ARBA00022660,
KW ECO:0000256|RuleBase:RU003385};
KW Transmembrane {ECO:0000256|ARBA:ARBA00022692,
KW ECO:0000256|RuleBase:RU003385};
KW Transmembrane helix {ECO:0000256|ARBA:ARBA00022989,
KW ECO:0000256|SAM:Phobius};
KW Transport {ECO:0000256|ARBA:ARBA00022448, ECO:0000256|RuleBase:RU003385}.
FT TRANSMEM 42..68
FT /note="Helical"
FT /evidence="ECO:0000256|SAM:Phobius"
FT TRANSMEM 88..114
FT /note="Helical"
FT /evidence="ECO:0000256|SAM:Phobius"
FT TRANSMEM 126..148
FT /note="Helical"
FT /evidence="ECO:0000256|SAM:Phobius"
FT TRANSMEM 160..181
FT /note="Helical"
FT /evidence="ECO:0000256|SAM:Phobius"
FT TRANSMEM 193..214
FT /note="Helical"
FT /evidence="ECO:0000256|SAM:Phobius"
FT TRANSMEM 246..268
FT /note="Helical"
FT /evidence="ECO:0000256|SAM:Phobius"
FT TRANSMEM 289..315
FT /note="Helical"
FT /evidence="ECO:0000256|SAM:Phobius"
FT TRANSMEM 321..341
FT /note="Helical"
FT /evidence="ECO:0000256|SAM:Phobius"
FT TRANSMEM 353..373
FT /note="Helical"
FT /evidence="ECO:0000256|SAM:Phobius"
FT TRANSMEM 379..402
FT /note="Helical"
FT /evidence="ECO:0000256|SAM:Phobius"
FT DOMAIN 13..224
FT /note="Cytochrome b/b6 N-terminal region profile"
FT /evidence="ECO:0000259|PROSITE:PS51002"
FT DOMAIN 227..413
FT /note="Cytochrome b/b6 C-terminal region profile"
FT /evidence="ECO:0000259|PROSITE:PS51003"
FT BINDING 96
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:0000256|PIRSR:PIRSR038885-2"
FT BINDING 110
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:0000256|PIRSR:PIRSR038885-2"
FT BINDING 197
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:0000256|PIRSR:PIRSR038885-2"
FT BINDING 211
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:0000256|PIRSR:PIRSR038885-2"
FT BINDING 216
FT /ligand="a ubiquinone"
FT /ligand_id="ChEBI:CHEBI:16389"
FT /evidence="ECO:0000256|PIRSR:PIRSR038885-1"
SQ SEQUENCE 424 AA; 48545 MW; 8FBF8746B53ACDC5 CRC64;
MQSNEPGPEF SGVVKWIDRR LPIFTMMSKE YQQFPVPRNL NYFWSFGALA SITLIVMIAT
GIFLAMQYQP NTELAFNSVE RIMRDVNYGW LIRYIHMNGA SMFFIVVYIH IFRGIYYGSY
KEPRELLWIL GVIILILMMA TAFMGYVLPW GQMSLWGATV ITNLFSAFPI IGEPIVTWLW
GGFAVDNATL NRFFALHYLL PFVIFAVVFL HIAALHIPGS NNPDGIDPKG PQDTVNFHPY
MTAKDMIGIA VFLLVYAALV FYAPNFLGHP DNYIPANPLV TPPHIVPEWY FLPFYAILRS
FVADWWFFQI FLGWWGMTAK LAGVLAMFGS LILLAVLPWL DTSRVRSCKY RPVYKWLVFL
FVIDFAILGY VGGKPAEGWY VIVAQWATLY YFFHLLILTP FVGWMERPKP LPASISQPAV
APAE
//
