ID   NUO3_SOLTU              Reviewed;          15 AA.
AC   P80263;
DT   01-FEB-1994, integrated into UniProtKB/Swiss-Prot.
DT   01-FEB-1994, sequence version 1.
DT   02-SEP-2026, entry version 70.
DE   RecName: Full=NADH-ubiquinone oxidoreductase 20 kDa subunit;
DE            EC=7.1.1.2;
DE   AltName: Full=Complex I-20kD;
DE            Short=CI-20kD;
DE   Flags: Fragment;
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   PROTEIN SEQUENCE.
RC   STRAIN=cv. Bintje; TISSUE=Tuber;
RX   PubMed=8294484; DOI=10.1016/s0021-9258(17)42163-6;
RA   Herz U., Schroeder W., Liddell A., Leaver C.J., Brennicke A., Grohmann L.;
RT   "Purification of the NADH:ubiquinone oxidoreductase (complex I) of the
RT   respiratory chain from the inner mitochondrial membrane of Solanum
RT   tuberosum.";
RL   J. Biol. Chem. 269:2263-2269(1994).
CC   -!- FUNCTION: Transfer of electrons from NADH to the respiratory chain. The
CC       immediate electron acceptor for the enzyme is believed to be
CC       ubiquinone.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=a ubiquinone + NADH + 5 H(+)(in) = a ubiquinol + NAD(+) + 4
CC         H(+)(out); Xref=Rhea:RHEA:29091, Rhea:RHEA-COMP:9565, Rhea:RHEA-
CC         COMP:9566, ChEBI:CHEBI:15378, ChEBI:CHEBI:16389, ChEBI:CHEBI:17976,
CC         ChEBI:CHEBI:57540, ChEBI:CHEBI:57945; EC=7.1.1.2;
CC   -!- SUBUNIT: Complex I is composed of about 45 different subunits.
CC       {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Mitochondrion inner membrane; Peripheral membrane
CC       protein; Matrix side.
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DR   PIR; G49732; G49732.
DR   PaxDb; 4113-P80263; -.
DR   InParanoid; P80263; -.
DR   Proteomes; UP000011115; Unassembled WGS sequence.
DR   GO; GO:0005743; C:mitochondrial inner membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0008137; F:NADH dehydrogenase (ubiquinone) activity; IEA:UniProtKB-EC.
PE   1: Evidence at protein level;
KW   Direct protein sequencing; Membrane; Mitochondrion;
KW   Mitochondrion inner membrane; NAD; Oxidoreductase; Reference proteome;
KW   Translocase; Ubiquinone.
FT   CHAIN           1..>15
FT                   /note="NADH-ubiquinone oxidoreductase 20 kDa subunit"
FT                   /id="PRO_0000118851"
FT   NON_TER         15
SQ   SEQUENCE   15 AA;  1573 MW;  8C80B69EFA87AAC9 CRC64;
     XSNATDETXL KDVSA
//