ID   QCR8_EQUAR              Reviewed;          20 AA.
AC   P81247;
DT   15-JUL-1998, integrated into UniProtKB/Swiss-Prot.
DT   15-JUL-1998, sequence version 1.
DT   25-MAY-2022, entry version 55.
DE   RecName: Full=Cytochrome b-c1 complex subunit 8;
DE   AltName: Full=Complex III subunit 8;
DE   AltName: Full=Complex III subunit VII;
DE   AltName: Full=Ubiquinol-cytochrome c reductase complex 9.5 kDa protein;
DE   AltName: Full=Ubiquinol-cytochrome c reductase complex ubiquinone-binding protein QP-C;
DE   Flags: Fragment;
GN   Name=QCR8;
OS   Equisetum arvense (Field horsetail) (Common horsetail).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Polypodiopsida; Equisetidae; Equisetales; Equisetaceae; Equisetum.
OX   NCBI_TaxID=3258;
RN   [1]
RP   PROTEIN SEQUENCE.
RX   PubMed=9582354; DOI=10.1074/jbc.273.21.13143;
RA   Brumme S., Kruft V., Schmitz U.K., Braun H.P.;
RT   "New insights into the co-evolution of cytochrome c reductase and the
RT   mitochondrial processing peptidase.";
RL   J. Biol. Chem. 273:13143-13149(1998).
CC   -!- FUNCTION: Component of the ubiquinol-cytochrome c oxidoreductase, a
CC       multisubunit transmembrane complex that is part of the mitochondrial
CC       electron transport chain which drives oxidative phosphorylation. The
CC       respiratory chain contains 3 multisubunit complexes succinate
CC       dehydrogenase (complex II, CII), ubiquinol-cytochrome c oxidoreductase
CC       (cytochrome b-c1 complex, complex III, CIII) and cytochrome c oxidase
CC       (complex IV, CIV), that cooperate to transfer electrons derived from
CC       NADH and succinate to molecular oxygen, creating an electrochemical
CC       gradient over the inner membrane that drives transmembrane transport
CC       and the ATP synthase. The cytochrome b-c1 complex catalyzes electron
CC       transfer from ubiquinol to cytochrome c, linking this redox reaction to
CC       translocation of protons across the mitochondrial inner membrane, with
CC       protons being carried across the membrane as hydrogens on the quinol.
CC       In the process called Q cycle, 2 protons are consumed from the matrix,
CC       4 protons are released into the intermembrane space and 2 electrons are
CC       passed to cytochrome c. {ECO:0000250|UniProtKB:P08525}.
CC   -!- SUBUNIT: Component of the ubiquinol-cytochrome c oxidoreductase
CC       (cytochrome b-c1 complex, complex III, CIII), a multisubunit enzyme
CC       composed of 3 respiratory subunits cytochrome b, cytochrome c1 and
CC       Rieske protein, 2 core protein subunits, and additional low-molecular
CC       weight protein subunits. The complex exists as an obligatory dimer and
CC       forms supercomplexes (SCs) in the inner mitochondrial membrane with
CC       cytochrome c oxidase (complex IV, CIV). {ECO:0000250|UniProtKB:P08525}.
CC   -!- SUBCELLULAR LOCATION: Mitochondrion inner membrane
CC       {ECO:0000250|UniProtKB:P08525}; Single-pass membrane protein
CC       {ECO:0000250|UniProtKB:P08525}.
CC   -!- SIMILARITY: Belongs to the UQCRQ/QCR8 family. {ECO:0000305}.
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DR   AlphaFoldDB; P81247; -.
DR   GO; GO:0005750; C:mitochondrial respiratory chain complex III; IEA:InterPro.
DR   InterPro; IPR020101; Cyt_b-c1_8-plants.
DR   Pfam; PF10890; Cyt_b-c1_8; 1.
PE   1: Evidence at protein level;
KW   Direct protein sequencing; Electron transport; Membrane; Mitochondrion;
KW   Mitochondrion inner membrane; Respiratory chain; Transport.
FT   CHAIN           1..>20
FT                   /note="Cytochrome b-c1 complex subunit 8"
FT                   /id="PRO_0000193547"
FT   NON_TER         20
SQ   SEQUENCE   20 AA;  2338 MW;  3921B02A1EFC8CE9 CRC64;
     QKVAVRLKEV VYTLSPHQQN