ID   NDUS3_PARPR             Reviewed;         209 AA.
AC   P15601;
DT   01-APR-1990, integrated into UniProtKB/Swiss-Prot.
DT   01-APR-1990, sequence version 1.
DT   25-MAY-2022, entry version 88.
DE   RecName: Full=NADH-ubiquinone oxidoreductase subunit 9;
DE            EC=7.1.1.2;
DE   AltName: Full=Protein P1;
GN   Name=NAD9;
OS   Paramecium primaurelia.
OG   Mitochondrion.
OC   Eukaryota; Sar; Alveolata; Ciliophora; Intramacronucleata;
OC   Oligohymenophorea; Peniculida; Parameciidae; Paramecium.
OX   NCBI_TaxID=5886;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=3023187; DOI=10.1016/0378-1119(86)90188-5;
RA   Pritchard A.E., Seilhamer J.J., Cummings D.J.;
RT   "Paramecium mitochondrial DNA sequences and RNA transcripts for cytochrome
RT   oxidase subunit I, URF1, and three ORFs adjacent to the replication
RT   origin.";
RL   Gene 44:243-253(1986).
CC   -!- FUNCTION: Core subunit of the mitochondrial membrane respiratory chain
CC       NADH dehydrogenase (Complex I) that is believed to belong to the
CC       minimal assembly required for catalysis. Complex I functions in the
CC       transfer of electrons from NADH to the respiratory chain. The immediate
CC       electron acceptor for the enzyme is believed to be ubiquinone (By
CC       similarity). {ECO:0000250}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=a ubiquinone + 5 H(+)(in) + NADH = a ubiquinol + 4 H(+)(out) +
CC         NAD(+); 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 30 different subunits.
CC   -!- SUBCELLULAR LOCATION: Mitochondrion inner membrane.
CC   -!- SIMILARITY: Belongs to the complex I 30 kDa subunit family.
CC       {ECO:0000305}.
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DR   EMBL; M15276; AAA79263.1; -; Genomic_DNA.
DR   AlphaFoldDB; P15601; -.
DR   SMR; P15601; -.
DR   GO; GO:0005743; C:mitochondrial inner membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0070469; C:respirasome; IEA:UniProtKB-KW.
DR   GO; GO:0008137; F:NADH dehydrogenase (ubiquinone) activity; IEA:UniProtKB-EC.
DR   Gene3D; 3.30.460.80; -; 1.
DR   InterPro; IPR037232; NADH_quin_OxRdtase_su_C/D-like.
DR   InterPro; IPR001268; NADH_UbQ_OxRdtase_30kDa_su.
DR   InterPro; IPR020396; NADH_UbQ_OxRdtase_CS.
DR   Pfam; PF00329; Complex1_30kDa; 1.
DR   SUPFAM; SSF143243; SSF143243; 1.
DR   PROSITE; PS00542; COMPLEX1_30K; 1.
PE   3: Inferred from homology;
KW   Electron transport; Membrane; Mitochondrion; Mitochondrion inner membrane;
KW   NAD; Oxidoreductase; Respiratory chain; Translocase; Transport; Ubiquinone.
FT   CHAIN           1..209
FT                   /note="NADH-ubiquinone oxidoreductase subunit 9"
FT                   /id="PRO_0000118646"
SQ   SEQUENCE   209 AA;  23655 MW;  B138B325711DAB43 CRC64;
     MSPQRPQRAF FCSEGAKKKK KPKYRFGFPM ALYFFFEKLN FSYWTSTTVS PNHYVCVLPA
     AASQALASVL GGELFLGKSQ LVEATAFDLT GQEVAAGDFL VFLKNNGIVL SYSFYFFLLK
     KRITFFLHGG EKVCSVEAFY SNANWLEREI SEMFGVSYLL KKDSRNLLLD YGSSFNPFLK
     KFPSTGHTEV VFNSFLKTTA YVQNASVEL