ID   NU3M_PROWI              Reviewed;         117 AA.
AC   Q37625;
DT   30-MAY-2000, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1996, sequence version 1.
DT   25-MAY-2022, entry version 72.
DE   RecName: Full=NADH-ubiquinone oxidoreductase chain 3;
DE            EC=7.1.1.2;
DE   AltName: Full=NADH dehydrogenase subunit 3;
GN   Name=NAD3;
OS   Prototheca wickerhamii.
OG   Mitochondrion.
OC   Eukaryota; Viridiplantae; Chlorophyta; core chlorophytes; Trebouxiophyceae;
OC   Chlorellales; Chlorellaceae; Prototheca.
OX   NCBI_TaxID=3111;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=263-11;
RX   PubMed=8133522; DOI=10.1006/jmbi.1994.1210;
RA   Wolff G., Plante I., Lang B.F., Kueck U., Burger G.;
RT   "Complete sequence of the mitochondrial DNA of the chlorophyte alga
RT   Prototheca wickerhamii. Gene content and genome organization.";
RL   J. Mol. Biol. 237:75-86(1994).
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   -!- SUBCELLULAR LOCATION: Mitochondrion membrane {ECO:0000250}; Multi-pass
CC       membrane protein {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the complex I subunit 3 family. {ECO:0000305}.
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DR   EMBL; U02970; AAD12652.1; -; Genomic_DNA.
DR   PIR; T11933; T11933.
DR   RefSeq; NP_042264.1; NC_001613.1.
DR   AlphaFoldDB; Q37625; -.
DR   SMR; Q37625; -.
DR   GeneID; 802113; -.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0031966; C:mitochondrial 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; 1.20.58.1610; -; 1.
DR   HAMAP; MF_01394; NDH1_NuoA; 1.
DR   InterPro; IPR023043; NAD(P)H_OxRDtase_bac/plastid.
DR   InterPro; IPR000440; NADH_UbQ/plastoQ_OxRdtase_su3.
DR   InterPro; IPR038430; NDAH_ubi_oxred_su3_sf.
DR   PANTHER; PTHR11058; PTHR11058; 1.
DR   Pfam; PF00507; Oxidored_q4; 1.
PE   3: Inferred from homology;
KW   Electron transport; Membrane; Mitochondrion; NAD; Respiratory chain;
KW   Translocase; Transmembrane; Transmembrane helix; Transport; Ubiquinone.
FT   CHAIN           1..117
FT                   /note="NADH-ubiquinone oxidoreductase chain 3"
FT                   /id="PRO_0000117815"
FT   TRANSMEM        4..24
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        61..81
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        86..106
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   117 AA;  13699 MW;  D07FC592F30076CB CRC64;
     MYEFLGILIY FFIALALSLL LLGLPFLVST RKADPEKISA YECGFDPFDD ARGRFDIQFY
     LVAILFIIFD LEVAFLFPWA LTLNKIGYFG FWSMMLFLFI LTVGFIYEWR KGALDWS