UniProt functional annotation for P00163



	UniProt functional annotation for P00163

UniProt code: P00163.

Organism: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast).

Taxonomy: Eukaryota; Fungi; Dikarya; Ascomycota; Saccharomycotina; Saccharomycetes; Saccharomycetales; Saccharomycetaceae; Saccharomyces.

Function: Component of the ubiquinol-cytochrome c oxidoreductase, a multisubunit transmembrane complex that is part of the mitochondrial electron transport chain which drives oxidative phosphorylation. The respiratory chain contains 3 multisubunit complexes succinate dehydrogenase (complex II, CII), ubiquinol-cytochrome c oxidoreductase (cytochrome b-c1 complex, complex III, CIII) and cytochrome c oxidase (complex IV, CIV), that cooperate to transfer electrons derived from NADH and succinate to molecular oxygen, creating an electrochemical gradient over the inner membrane that drives transmembrane transport and the ATP synthase. The cytochrome b-c1 complex catalyzes electron transfer from ubiquinol to cytochrome c, linking this redox reaction to translocation of protons across the mitochondrial inner membrane, with protons being carried across the membrane as hydrogens on the quinol. In the process called Q cycle, 2 protons are consumed from the matrix, 4 protons are released into the intermembrane space and 2 electrons are passed to cytochrome c (Probable). Cytochrome b is a catalytic core subunit containing 2 b-type hemes BL and BH topographically segregated in the quinone reduction (Qi) and quinol oxidation (Q0) sites on opposite sides of the membrane (PubMed:18390544). {ECO:0000269|PubMed:18390544, ECO:0000305|PubMed:11880631, ECO:0000305|PubMed:2551731, ECO:0000305|PubMed:8031140}.

Catalytic activity: Reaction=2 [Fe(III)cytochrome c](out) + a quinol = 2 [Fe(II)cytochrome c](out) + a quinone + 2 H(+)(out); Xref=Rhea:RHEA:11484, Rhea:RHEA- COMP:10350, Rhea:RHEA-COMP:14399, ChEBI:CHEBI:15378, ChEBI:CHEBI:24646, ChEBI:CHEBI:29033, ChEBI:CHEBI:29034, ChEBI:CHEBI:132124; EC=7.1.1.8; Evidence={ECO:0000269|PubMed:2551731, ECO:0000269|PubMed:8031140};

Cofactor: Name=heme; Xref=ChEBI:CHEBI:30413; Evidence={ECO:0000269|PubMed:10873857, ECO:0000269|PubMed:11880631, ECO:0000269|PubMed:18390544, ECO:0000269|PubMed:30598554}; Note=Binds 2 heme b groups non-covalently per subunit. {ECO:0000269|PubMed:10873857, ECO:0000269|PubMed:11880631, ECO:0000269|PubMed:18390544, ECO:0000269|PubMed:30598554};

Subunit: Component of the ubiquinol-cytochrome c oxidoreductase (cytochrome b-c1 complex, complex III, CIII), a multisubunit enzyme composed of 10 subunits. The complex is composed of 3 respiratory subunits cytochrome b (COB), cytochrome c1 (CYT1) and Rieske protein (RIP1), 2 core protein subunits COR1 and QCR2, and 5 low-molecular weight protein subunits QCR6, QCR7, QCR8, QCR9 and QCR10 (PubMed:10873857, PubMed:11880631, PubMed:8031140, PubMed:30598554). The complex exists as an obligatory dimer and forms supercomplexes (SCs) in the inner mitochondrial membrane with a monomer or a dimer of cytochrome c oxidase (complex IV, CIV), resulting in 2 different assemblies (supercomplexes III(2)IV and III(2)IV(2)) (PubMed:10775262, PubMed:10764779, PubMed:30598556, PubMed:30598554). {ECO:0000269|PubMed:10764779, ECO:0000269|PubMed:10775262, ECO:0000269|PubMed:10873857, ECO:0000269|PubMed:11880631, ECO:0000269|PubMed:30598554, ECO:0000269|PubMed:30598556, ECO:0000269|PubMed:8031140}.

Subcellular location: Mitochondrion inner membrane {ECO:0000269|PubMed:18390544, ECO:0000269|PubMed:30598554, ECO:0000269|PubMed:8031140}; Multi-pass membrane protein {ECO:0000269|PubMed:10873857, ECO:0000269|PubMed:11880631, ECO:0000269|PubMed:18390544, ECO:0000269|PubMed:30598554, ECO:0000269|PubMed:8031140}.

Miscellaneous: Heme 1 (or BL or b562) is low-potential and absorbs at about 562 nm, and heme 2 (or BH or b566) is high-potential and absorbs at about 566 nm. {ECO:0000250}.

Similarity: Belongs to the cytochrome b family. {ECO:0000255|PROSITE- ProRule:PRU00967, ECO:0000255|PROSITE-ProRule:PRU00968}.

Annotations taken from UniProtKB at the EBI.


Organism:		Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast).
Taxonomy:		Eukaryota; Fungi; Dikarya; Ascomycota; Saccharomycotina; Saccharomycetes; Saccharomycetales; Saccharomycetaceae; Saccharomyces.



Function:		Component of the ubiquinol-cytochrome c oxidoreductase, a multisubunit transmembrane complex that is part of the mitochondrial electron transport chain which drives oxidative phosphorylation. The respiratory chain contains 3 multisubunit complexes succinate dehydrogenase (complex II, CII), ubiquinol-cytochrome c oxidoreductase (cytochrome b-c1 complex, complex III, CIII) and cytochrome c oxidase (complex IV, CIV), that cooperate to transfer electrons derived from NADH and succinate to molecular oxygen, creating an electrochemical gradient over the inner membrane that drives transmembrane transport and the ATP synthase. The cytochrome b-c1 complex catalyzes electron transfer from ubiquinol to cytochrome c, linking this redox reaction to translocation of protons across the mitochondrial inner membrane, with protons being carried across the membrane as hydrogens on the quinol. In the process called Q cycle, 2 protons are consumed from the matrix, 4 protons are released into the intermembrane space and 2 electrons are passed to cytochrome c (Probable). Cytochrome b is a catalytic core subunit containing 2 b-type hemes BL and BH topographically segregated in the quinone reduction (Qi) and quinol oxidation (Q0) sites on opposite sides of the membrane (PubMed:18390544). {ECO:0000269\|PubMed:18390544, ECO:0000305\|PubMed:11880631, ECO:0000305\|PubMed:2551731, ECO:0000305\|PubMed:8031140}.


Catalytic activity:		Reaction=2 [Fe(III)cytochrome c](out) + a quinol = 2 [Fe(II)cytochrome c](out) + a quinone + 2 H(+)(out); Xref=Rhea:RHEA:11484, Rhea:RHEA- COMP:10350, Rhea:RHEA-COMP:14399, ChEBI:CHEBI:15378, ChEBI:CHEBI:24646, ChEBI:CHEBI:29033, ChEBI:CHEBI:29034, ChEBI:CHEBI:132124; EC=7.1.1.8; Evidence={ECO:0000269\|PubMed:2551731, ECO:0000269\|PubMed:8031140};
Cofactor:		Name=heme; Xref=ChEBI:CHEBI:30413; Evidence={ECO:0000269\|PubMed:10873857, ECO:0000269\|PubMed:11880631, ECO:0000269\|PubMed:18390544, ECO:0000269\|PubMed:30598554}; Note=Binds 2 heme b groups non-covalently per subunit. {ECO:0000269\|PubMed:10873857, ECO:0000269\|PubMed:11880631, ECO:0000269\|PubMed:18390544, ECO:0000269\|PubMed:30598554};
Subunit:		Component of the ubiquinol-cytochrome c oxidoreductase (cytochrome b-c1 complex, complex III, CIII), a multisubunit enzyme composed of 10 subunits. The complex is composed of 3 respiratory subunits cytochrome b (COB), cytochrome c1 (CYT1) and Rieske protein (RIP1), 2 core protein subunits COR1 and QCR2, and 5 low-molecular weight protein subunits QCR6, QCR7, QCR8, QCR9 and QCR10 (PubMed:10873857, PubMed:11880631, PubMed:8031140, PubMed:30598554). The complex exists as an obligatory dimer and forms supercomplexes (SCs) in the inner mitochondrial membrane with a monomer or a dimer of cytochrome c oxidase (complex IV, CIV), resulting in 2 different assemblies (supercomplexes III(2)IV and III(2)IV(2)) (PubMed:10775262, PubMed:10764779, PubMed:30598556, PubMed:30598554). {ECO:0000269\|PubMed:10764779, ECO:0000269\|PubMed:10775262, ECO:0000269\|PubMed:10873857, ECO:0000269\|PubMed:11880631, ECO:0000269\|PubMed:30598554, ECO:0000269\|PubMed:30598556, ECO:0000269\|PubMed:8031140}.
Subcellular location:		Mitochondrion inner membrane {ECO:0000269\|PubMed:18390544, ECO:0000269\|PubMed:30598554, ECO:0000269\|PubMed:8031140}; Multi-pass membrane protein {ECO:0000269\|PubMed:10873857, ECO:0000269\|PubMed:11880631, ECO:0000269\|PubMed:18390544, ECO:0000269\|PubMed:30598554, ECO:0000269\|PubMed:8031140}.
Miscellaneous:		Heme 1 (or BL or b562) is low-potential and absorbs at about 562 nm, and heme 2 (or BH or b566) is high-potential and absorbs at about 566 nm. {ECO:0000250}.
Similarity:		Belongs to the cytochrome b family. {ECO:0000255\|PROSITE- ProRule:PRU00967, ECO:0000255\|PROSITE-ProRule:PRU00968}.