ID   NDUS3_RECAM             Reviewed;         204 AA.
AC   O21271;
DT   30-MAY-2000, integrated into UniProtKB/Swiss-Prot.
DT   01-JAN-1998, sequence version 1.
DT   25-MAY-2022, entry version 91.
DE   RecName: Full=NADH-ubiquinone oxidoreductase subunit 9;
DE            EC=7.1.1.2;
GN   Name=NAD9;
OS   Reclinomonas americana.
OG   Mitochondrion.
OC   Eukaryota; Discoba; Jakobida; Histionina; Histionidae; Reclinomonas.
OX   NCBI_TaxID=48483;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=ATCC 50394;
RX   PubMed=9168110; DOI=10.1038/387493a0;
RA   Lang B.F., Burger G., O'Kelly C.J., Cedergren R., Golding G.B., Lemieux C.,
RA   Sankoff D., Turmel M., Gray M.W.;
RT   "An ancestral mitochondrial DNA resembling a eubacterial genome in
RT   miniature.";
RL   Nature 387:493-497(1997).
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 {ECO:0000250}.
CC       Note=Matrix and cytoplasmic side of the mitochondrial inner membrane.
CC       {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the complex I 30 kDa subunit family.
CC       {ECO:0000305}.
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DR   EMBL; AF007261; AAD11898.1; -; Genomic_DNA.
DR   PIR; S78165; S78165.
DR   RefSeq; NP_044783.1; NC_001823.1.
DR   AlphaFoldDB; O21271; -.
DR   SMR; O21271; -.
DR   GeneID; 801075; -.
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   HAMAP; MF_01357; NDH1_NuoC; 1.
DR   InterPro; IPR010218; NADH_DH_suC.
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   TIGRFAMs; TIGR01961; NuoC_fam; 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..204
FT                   /note="NADH-ubiquinone oxidoreductase subunit 9"
FT                   /id="PRO_0000118649"
SQ   SEQUENCE   204 AA;  24239 MW;  8AA999B21913AEC6 CRC64;
     MKKQEQNQFL KEFGISLIKM FPKYIDKAIY SKGELTLHVK PTNLIALMKI LKNHTNCQFK
     SLSDLCAVDF PEKKERFEIV YNLLSVRYNS RIRVKTFVDE LTPVPSVTCL FQAAGWFERE
     VWDLFGVYFT NHPDLRRILT DYGFEGHPMR KDFPLTGYVE VRYDDEQKRV VTESLEMTQE
     FRSFNFTSPW EQIEISKPNI KEKK