ID   QCR9_SOLTU              Reviewed;          72 AA.
AC   P46270;
DT   01-NOV-1995, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1995, sequence version 1.
DT   03-AUG-2022, entry version 105.
DE   RecName: Full=Cytochrome b-c1 complex subunit 9;
DE   AltName: Full=Complex III subunit 9;
DE   AltName: Full=Complex III subunit X;
DE   AltName: Full=Ubiquinol-cytochrome c reductase complex 8.0 kDa protein;
OS   Solanum tuberosum (Potato).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   asterids; lamiids; Solanales; Solanaceae; Solanoideae; Solaneae; Solanum.
OX   NCBI_TaxID=4113;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA], AND PROTEIN SEQUENCE OF 1-17.
RC   STRAIN=cv. Desiree; TISSUE=Tuber;
RX   PubMed=7727497; DOI=10.1016/0005-2728(94)00199-f;
RA   Braun H.-P., Schmitz U.K.;
RT   "Molecular structure of the 8.0 kDa subunit of cytochrome-c reductase from
RT   potato and its delta psi-dependent import into isolated mitochondria.";
RL   Biochim. Biophys. Acta 1229:181-186(1995).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=cv. DM1-3 516 R44;
RX   PubMed=21743474; DOI=10.1038/nature10158;
RG   The Potato Genome Sequencing Consortium;
RT   "Genome sequence and analysis of the tuber crop potato.";
RL   Nature 475:189-195(2011).
RN   [3]
RP   PROTEIN SEQUENCE OF 48-52 AND 57-72.
RC   STRAIN=cv. Hansa; TISSUE=Tuber;
RX   PubMed=7764624; DOI=10.1007/bf00191612;
RA   Braun H.-P., Kruft V., Schmitz U.K.;
RT   "Molecular identification of the ten subunits of cytochrome-c reductase
RT   from potato mitochondria.";
RL   Planta 193:99-106(1994).
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:P22289}.
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:P22289}.
CC   -!- SUBCELLULAR LOCATION: Mitochondrion inner membrane
CC       {ECO:0000250|UniProtKB:P22289}; Single-pass membrane protein
CC       {ECO:0000250|UniProtKB:P22289}.
CC   -!- SIMILARITY: Belongs to the UQCR10/QCR9 family. {ECO:0000305}.
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DR   EMBL; X79274; CAA55861.1; -; mRNA.
DR   PIR; T07369; T07369.
DR   AlphaFoldDB; P46270; -.
DR   SMR; P46270; -.
DR   STRING; 4113.PGSC0003DMT400067732; -.
DR   PRIDE; P46270; -.
DR   EnsemblPlants; PGSC0003DMT400067733; PGSC0003DMT400067733; PGSC0003DMG400026342.
DR   Gramene; PGSC0003DMT400067733; PGSC0003DMT400067733; PGSC0003DMG400026342.
DR   eggNOG; KOG3494; Eukaryota.
DR   HOGENOM; CLU_171977_4_0_1; -.
DR   InParanoid; P46270; -.
DR   OMA; RYKDISV; -.
DR   Proteomes; UP000011115; Unassembled WGS sequence.
DR   ExpressionAtlas; P46270; baseline and differential.
DR   GO; GO:0005750; C:mitochondrial respiratory chain complex III; IBA:GO_Central.
DR   GO; GO:0006122; P:mitochondrial electron transport, ubiquinol to cytochrome c; IBA:GO_Central.
DR   Gene3D; 1.20.5.260; -; 1.
DR   InterPro; IPR008027; QCR9.
DR   InterPro; IPR036656; QCR9_sf.
DR   PANTHER; PTHR12980; PTHR12980; 1.
DR   Pfam; PF05365; UCR_UQCRX_QCR9; 1.
DR   SUPFAM; SSF81514; SSF81514; 1.
PE   1: Evidence at protein level;
KW   Direct protein sequencing; Electron transport; Membrane; Mitochondrion;
KW   Mitochondrion inner membrane; Reference proteome; Respiratory chain;
KW   Transmembrane; Transmembrane helix; Transport.
FT   CHAIN           1..72
FT                   /note="Cytochrome b-c1 complex subunit 9"
FT                   /id="PRO_0000193556"
FT   TOPO_DOM        1..27
FT                   /note="Mitochondrial matrix"
FT                   /evidence="ECO:0000250|UniProtKB:P22289"
FT   TRANSMEM        28..53
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P22289"
FT   TOPO_DOM        54..72
FT                   /note="Mitochondrial intermembrane"
FT                   /evidence="ECO:0000250|UniProtKB:P22289"
SQ   SEQUENCE   72 AA;  8048 MW;  6C5547C74B460177 CRC64;
     MESAARRSGG GVLEGFYRLV MRRTPVYVTF VIAGALLGER AVDYGVKTLW EKNNVGKRYE
     DISVLGQRPV DE