ID   NU4M_STRPU              Reviewed;         463 AA.
AC   P15551;
DT   01-APR-1990, integrated into UniProtKB/Swiss-Prot.
DT   01-FEB-1996, sequence version 2.
DT   25-MAY-2022, entry version 93.
DE   RecName: Full=NADH-ubiquinone oxidoreductase chain 4;
DE            EC=7.1.1.2;
DE   AltName: Full=NADH dehydrogenase subunit 4;
GN   Name=ND4;
OS   Strongylocentrotus purpuratus (Purple sea urchin).
OG   Mitochondrion.
OC   Eukaryota; Metazoa; Echinodermata; Eleutherozoa; Echinozoa; Echinoidea;
OC   Euechinoidea; Echinacea; Camarodonta; Echinidea; Strongylocentrotidae;
OC   Strongylocentrotus.
OX   NCBI_TaxID=7668;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=3172215; DOI=10.1016/0022-2836(88)90452-4;
RA   Jacobs H.T., Elliott D.J., Math V.B., Farquharson A.;
RT   "Nucleotide sequence and gene organization of sea urchin mitochondrial
RT   DNA.";
RL   J. Mol. Biol. 202:185-217(1988).
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 4 family. {ECO:0000305}.
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DR   EMBL; X12631; CAA31159.2; -; Genomic_DNA.
DR   PIR; S01508; S01508.
DR   RefSeq; NP_006974.2; NC_001453.1.
DR   AlphaFoldDB; P15551; -.
DR   SMR; P15551; -.
DR   GeneID; 2652724; -.
DR   KEGG; spu:2652724; -.
DR   CTD; 4538; -.
DR   InParanoid; P15551; -.
DR   OrthoDB; 996580at2759; -.
DR   Proteomes; UP000007110; Unassembled WGS sequence.
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   GO; GO:0048039; F:ubiquinone binding; IBA:GO_Central.
DR   GO; GO:0009060; P:aerobic respiration; IBA:GO_Central.
DR   GO; GO:0042773; P:ATP synthesis coupled electron transport; IEA:InterPro.
DR   GO; GO:0015990; P:electron transport coupled proton transport; IBA:GO_Central.
DR   InterPro; IPR000260; NADH4_N.
DR   InterPro; IPR010227; NADH_Q_OxRdtase_chainM/4.
DR   InterPro; IPR003918; NADH_UbQ_OxRdtase.
DR   InterPro; IPR001750; ND/Mrp_mem.
DR   PANTHER; PTHR43507; PTHR43507; 1.
DR   Pfam; PF01059; Oxidored_q5_N; 1.
DR   Pfam; PF00361; Proton_antipo_M; 1.
DR   PRINTS; PR01437; NUOXDRDTASE4.
DR   TIGRFAMs; TIGR01972; NDH_I_M; 1.
PE   3: Inferred from homology;
KW   Electron transport; Membrane; Mitochondrion; NAD; Reference proteome;
KW   Respiratory chain; Translocase; Transmembrane; Transmembrane helix;
KW   Transport; Ubiquinone.
FT   CHAIN           1..463
FT                   /note="NADH-ubiquinone oxidoreductase chain 4"
FT                   /id="PRO_0000117991"
FT   TRANSMEM        24..44
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        62..82
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        98..118
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        119..139
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        151..171
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        198..218
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        232..252
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        260..280
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        285..305
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        310..330
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        353..373
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        404..424
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        442..462
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   463 AA;  50508 MW;  5C8E73FE7D5CAAF0 CRC64;
     MMITLILFTV GMATTTLLIP SNKLWAGAIF QSALLSLLSL IVLNNHWTAS WHNLSSILAS
     DTISAPLIIL SCWLAPIALI ASKGQLNNSS DLGSRVFIIM IIVITGALII TFSSLELILF
     YIVVETTLIP TLILITRWGA QMERCQAGLY FMFYTLFGSL PLLIAIIAIY ISSSSLSIPN
     VNLLWANDGS IESLTMWWAL SINCFFNNLP VYGFHLWLPK AHVEAPVAGS MILAAILLKI
     GGYGLMRLIA LFSTISMNAL SLALIVFCTW GALITSVICV RQTDLKALIA YSSVGHMSIV
     AAAIFSETSW GMNGALMLMV AHGLVSSALF SLANTVYERS GTRTLAITRG LKLLLPLSTL
     WWLLMCAANL GLPPSPNLIG EILILSSLIS WSVWLFPIVG FAQVFGAIYS LMIFQLSQQG
     TPFTSIINVF SSFSREHLFA ALHILPLILI MINPFSALIA WLK