ID   NU2M_MARFT              Reviewed;         346 AA.
AC   O63797;
DT   02-NOV-2001, integrated into UniProtKB/Swiss-Prot.
DT   01-AUG-1998, sequence version 1.
DT   25-MAY-2022, entry version 75.
DE   RecName: Full=NADH-ubiquinone oxidoreductase chain 2;
DE            EC=7.1.1.2;
DE   AltName: Full=NADH dehydrogenase subunit 2;
GN   Name=MT-ND2; Synonyms=MTND2, NADH2, ND2;
OS   Mareca falcata (Falcated duck) (Anas falcata).
OG   Mitochondrion.
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC   Archelosauria; Archosauria; Dinosauria; Saurischia; Theropoda;
OC   Coelurosauria; Aves; Neognathae; Galloanserae; Anseriformes; Anatidae;
OC   Anatinae; Mareca.
OX   NCBI_TaxID=75844;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=9751919; DOI=10.1006/mpev.1997.0481;
RA   Johnson K.P., Sorenson M.D.;
RT   "Comparing molecular evolution in two mitochondrial protein coding genes
RT   (cytochrome b and ND2) in the dabbling ducks (Tribe: Anatini).";
RL   Mol. Phylogenet. Evol. 10:82-94(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 inner membrane; Multi-pass membrane
CC       protein.
CC   -!- SIMILARITY: Belongs to the complex I subunit 2 family. {ECO:0000305}.
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DR   EMBL; AF059166; AAC14860.1; -; Genomic_DNA.
DR   AlphaFoldDB; O63797; -.
DR   SMR; O63797; -.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
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   GO; GO:0006120; P:mitochondrial electron transport, NADH to ubiquinone; IEA:InterPro.
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..346
FT                   /note="NADH-ubiquinone oxidoreductase chain 2"
FT                   /id="PRO_0000117544"
FT   TRANSMEM        1..21
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        95..115
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        124..144
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        149..169
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        178..195
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        200..219
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        242..262
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        274..294
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        326..346
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   346 AA;  37681 MW;  A77B38FD2A6CE20A CRC64;
     MNPHATPVLV LSLALGTTIT ISSNHWVLAW TGLEINTLAI IPLISKSHHP RAVEAATKYF
     LTQAAASALV LFSSMTNAWA TGQWDITQLN HPTSCLLLTA AIAIKLGLVP FHFWFPEVLQ
     GSPLMTALLL STLMKFPPLT LLLMTSKSLN PALLTTMALA SAALGGWMGL NQTQTRKILA
     FSSISHLGWI AIILVYSPKL ALLTFYLYAI MTSAVFMALN KIKALNLSMV LTSWTKTPVL
     NATLMLVLLS LAGLPPLTGF MPKWLIIQEL TKQEMTPAAM AIAMLSLLSL FFYLRLAYHS
     TITLPPNSSN HMKQWYTSKP PSTPTAILAS LSILLLPLSP MIHAIV