ID   NU4M_LYCSM              Reviewed;         445 AA.
AC   O79555;
DT   01-JUN-2001, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1998, sequence version 1.
DT   25-MAY-2022, entry version 78.
DE   RecName: Full=NADH-ubiquinone oxidoreductase chain 4;
DE            EC=7.1.1.2;
DE   AltName: Full=NADH dehydrogenase subunit 4;
GN   Name=MT-ND4; Synonyms=MTND4, NADH4, ND4;
OS   Lycodon semicarinatus (Ryukyu odd-tooth snake) (Eumesodon semicarinatus).
OG   Mitochondrion.
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC   Lepidosauria; Squamata; Bifurcata; Unidentata; Episquamata; Toxicofera;
OC   Serpentes; Colubroidea; Colubridae; Colubrinae; Lycodon.
OX   NCBI_TaxID=56549;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   TISSUE=Liver;
RX   PubMed=9725849; DOI=10.1093/genetics/150.1.313;
RA   Kumazawa Y., Ota H., Nishida M., Ozawa T.;
RT   "The complete nucleotide sequence of a snake (Dinodon semicarinatus)
RT   mitochondrial genome with two identical control regions.";
RL   Genetics 150:313-329(1998).
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; AB008539; BAA33031.1; -; Genomic_DNA.
DR   PIR; T11097; T11097.
DR   RefSeq; NP_008428.1; NC_001945.1.
DR   AlphaFoldDB; O79555; -.
DR   SMR; O79555; -.
DR   GeneID; 808275; -.
DR   CTD; 4538; -.
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:0042773; P:ATP synthesis coupled electron transport; IEA:InterPro.
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; Respiratory chain;
KW   Translocase; Transmembrane; Transmembrane helix; Transport; Ubiquinone.
FT   CHAIN           1..445
FT                   /note="NADH-ubiquinone oxidoreductase chain 4"
FT                   /id="PRO_0000117929"
FT   TRANSMEM        22..42
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        54..74
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        87..107
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        108..128
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        141..161
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        186..206
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        215..235
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        248..268
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        276..296
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        300..320
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        332..352
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        383..403
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        425..445
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   445 AA;  50068 MW;  97D37ED440D5DE62 CRC64;
     MLKITFMTMM LIPTTLILKP KMLYQTTTSY SFMIALFSLS LLEPNSNTYL HLDSTSAPLL
     LLSYWLMPMT MMASQHAMNK EPLQRQRTFL SILTLLQLFI SLTFMASNIT LMYIMFEATL
     IPTLIIITRW GQQTERLTAG TYFMMYTLTT SMPLLTAILF INNTTNTPTL FMQMMQTTSP
     WTELMLWIAC LGAFLAKMPV YGLHLWLPKA HVEAPIAGSM VLAAILLKLG GYGIIRMTQI
     LPTMKTDLFL PFIVLSLWGA TLANLTCLQQ TDLKSLIAYS SVSHMGLVIA ATMIQTQWSL
     SGAMALMIAH GFTSSALFCL ANTTYERTKT RIMILTRGFH SILPMITTWW LMTNLMNIAT
     PPSINFTGEL LIASSLFNWC PTTIILFGLS MLITASYSLH MLLSTQTGTP TLNMVTYPTH
     SREHLLMVLH ILPLMLISLK PELII