ID   NU2M_HALGR              Reviewed;         347 AA.
AC   P38599;
DT   01-OCT-1994, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-1994, sequence version 1.
DT   25-MAY-2022, entry version 84.
DE   RecName: Full=NADH-ubiquinone oxidoreductase chain 2 {ECO:0000250|UniProtKB:P03891};
DE            EC=7.1.1.2 {ECO:0000250|UniProtKB:P03891};
DE   AltName: Full=NADH dehydrogenase subunit 2;
GN   Name=MT-ND2 {ECO:0000250|UniProtKB:P03891}; Synonyms=MTND2, NADH2, ND2;
OS   Halichoerus grypus (Gray seal) (Phoca grypus).
OG   Mitochondrion.
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC   Eutheria; Laurasiatheria; Carnivora; Caniformia; Phocidae; Halichoerus.
OX   NCBI_TaxID=9711;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=8308902; DOI=10.1007/bf00178862;
RA   Arnason U., Gullberg A., Johnsson E., Ledje C.;
RT   "The nucleotide sequence of the mitochondrial DNA molecule of the grey
RT   seal, Halichoerus grypus, and a comparison with mitochondrial sequences of
RT   other true seals.";
RL   J. Mol. Evol. 37:323-330(1993).
CC   -!- FUNCTION: Core subunit of the mitochondrial membrane respiratory chain
CC       NADH dehydrogenase (Complex I) which catalyzes electron transfer from
CC       NADH through the respiratory chain, using ubiquinone as an electron
CC       acceptor. Essential for the catalytic activity and assembly of complex
CC       I. {ECO:0000250|UniProtKB:P03891}.
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         Evidence={ECO:0000250|UniProtKB:P03891};
CC   -!- SUBUNIT: Core subunit of respiratory chain NADH dehydrogenase (Complex
CC       I) which is composed of 45 different subunits. Interacts with TMEM242
CC       (By similarity). {ECO:0000250|UniProtKB:P03891,
CC       ECO:0000250|UniProtKB:P03892}.
CC   -!- SUBCELLULAR LOCATION: Mitochondrion inner membrane
CC       {ECO:0000250|UniProtKB:P03892}; Multi-pass membrane protein
CC       {ECO:0000255}.
CC   -!- SIMILARITY: Belongs to the complex I subunit 2 family. {ECO:0000305}.
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DR   EMBL; X72004; CAA50878.1; -; Genomic_DNA.
DR   PIR; S41836; S41836.
DR   RefSeq; NP_007070.1; NC_001602.1.
DR   AlphaFoldDB; P38599; -.
DR   SMR; P38599; -.
DR   GeneID; 807756; -.
DR   CTD; 4536; -.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0005743; C:mitochondrial inner membrane; ISS:UniProtKB.
DR   GO; GO:0070469; C:respirasome; IEA:UniProtKB-KW.
DR   GO; GO:0008137; F:NADH dehydrogenase (ubiquinone) activity; ISS:UniProtKB.
DR   GO; GO:0006120; P:mitochondrial electron transport, NADH to ubiquinone; ISS:UniProtKB.
DR   GO; GO:0032981; P:mitochondrial respiratory chain complex I assembly; ISS:UniProtKB.
DR   InterPro; IPR010933; NADH_DH_su2_C.
DR   InterPro; IPR003917; NADH_UbQ_OxRdtase_chain2.
DR   InterPro; IPR001750; ND/Mrp_mem.
DR   Pfam; PF06444; NADH_dehy_S2_C; 1.
DR   Pfam; PF00361; Proton_antipo_M; 1.
DR   PRINTS; PR01436; NADHDHGNASE2.
PE   3: Inferred from homology;
KW   Electron transport; Membrane; Mitochondrion; Mitochondrion inner membrane;
KW   NAD; Respiratory chain; Translocase; Transmembrane; Transmembrane helix;
KW   Transport; Ubiquinone.
FT   CHAIN           1..347
FT                   /note="NADH-ubiquinone oxidoreductase chain 2"
FT                   /id="PRO_0000117591"
FT   TRANSMEM        3..23
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        25..45
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        60..80
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        96..116
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        122..142
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        153..173
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        178..198
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        200..220
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        237..257
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        274..294
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        323..343
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   347 AA;  38767 MW;  902B7D1063BF9CDA CRC64;
     MKPPILIIIM STVMSGTMIV LTSSHWLLIW IGFEMNMLAI IPILMKNHTP RATEASTKYF
     LTQATASMLL MMGIIINLMF SGEWSISKIP NPIASGLVTI ALTMKLGMAP FHFWVPEVTQ
     GISLSSGMIL LTWQKIAPLS ILYQISPSIN PKLLITMAIA SVLIGGWGGL NQTQLRKILA
     YSSIAHMGWM AVILTYNPTL MILNLTIYIT MTLSTFMLFM HNSSTTTLSL SNTWNKLPLM
     TSLILVLMMS LGGLPPLSGF APKWMIIQEL TKNDMIILPT FMAITALLNL YFYMRLSYTT
     ALTMFPSVNN MKMKWQFESA KKIILLPPLI IISTMLLPMT PMMSILE