ID   NU2M_ALBCA              Reviewed;         307 AA.
AC   P48902;
DT   01-FEB-1996, integrated into UniProtKB/Swiss-Prot.
DT   01-FEB-1996, 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=ND2;
OS   Albinaria caerulea (Land snail).
OG   Mitochondrion.
OC   Eukaryota; Metazoa; Spiralia; Lophotrochozoa; Mollusca; Gastropoda;
OC   Heterobranchia; Euthyneura; Panpulmonata; Eupulmonata; Stylommatophora;
OC   Helicina; Clausilioidea; Clausiliidae; Alopiinae; Albinaria.
OX   NCBI_TaxID=42349;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=7498775; DOI=10.1093/genetics/140.4.1353;
RA   Hatzoglou E., Rodakis G.C., Lecanidou R.;
RT   "Complete sequence and gene organization of the mitochondrial genome of the
RT   land snail Albinaria coerulea.";
RL   Genetics 140:1353-1366(1995).
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; X83390; CAA58306.1; -; Genomic_DNA.
DR   PIR; S59153; S59153.
DR   RefSeq; NP_007339.1; NC_001761.1.
DR   AlphaFoldDB; P48902; -.
DR   SMR; P48902; -.
DR   GeneID; 808000; -.
DR   CTD; 4536; -.
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   InterPro; IPR001750; ND/Mrp_mem.
DR   Pfam; PF00361; Proton_antipo_M; 1.
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..307
FT                   /note="NADH-ubiquinone oxidoreductase chain 2"
FT                   /id="PRO_0000117540"
FT   TRANSMEM        1..21
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        25..45
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        58..78
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        88..108
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        119..139
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        144..164
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        193..213
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        217..237
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        250..270
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        287..307
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   307 AA;  34865 MW;  CF27C405278CB92D CRC64;
     MTLQSVLLGA MIILGPILSM TSSNWIIIWI GLEISLLGFV SYYMLMKKIM SGEGIMMYFL
     IQSVSSTVML LNGLYIFVNH ASSYIYLFIF ITMLMLKIGM FPLHFWIIPV YSKLSYLNIG
     IVGLLLKIVP MWILMHMGCI TSEMLNLITM LSVTSMLFGA LIGMNLSKMR MVLGASTITH
     NGWLGMSCIS GSLFKYFITY GFSLVILLVF LYLGDKMSIS LSLLSLSGLP PFMLFIGKIN
     VLLMMMETNL WFIVLVFAIL SAVISLVYYL KFSVMFFMNM KNNYLKHYKM AMFLLVNVTF
     GMLLFLT