ID   NU4LM_SQUAC             Reviewed;          98 AA.
AC   Q9ZZ46;
DT   30-MAY-2000, integrated into UniProtKB/Swiss-Prot.
DT   01-MAY-1999, sequence version 1.
DT   25-MAY-2022, entry version 80.
DE   RecName: Full=NADH-ubiquinone oxidoreductase chain 4L;
DE            EC=7.1.1.2;
DE   AltName: Full=NADH dehydrogenase subunit 4L;
GN   Name=MT-ND4L; Synonyms=MTND4L, NADH4L, ND4L;
OS   Squalus acanthias (Spiny dogfish).
OG   Mitochondrion.
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Chondrichthyes;
OC   Elasmobranchii; Squalomorphii; Squaliformes; Squalidae; Squalus.
OX   NCBI_TaxID=7797;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=9873084; DOI=10.1007/pl00006439;
RA   Rasmussen A.S., Arnason U.;
RT   "Phylogenetic studies of complete mitochondrial DNA molecules place
RT   cartilaginous fishes within the tree of bony fishes.";
RL   J. Mol. Evol. 48:118-123(1999).
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 4L family. {ECO:0000305}.
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DR   EMBL; Y18134; CAA77057.1; -; Genomic_DNA.
DR   PIR; T11542; T11542.
DR   RefSeq; NP_008531.1; NC_002012.1.
DR   AlphaFoldDB; Q9ZZ46; -.
DR   SMR; Q9ZZ46; -.
DR   GeneID; 808381; -.
DR   CTD; 4539; -.
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; IPR001133; NADH_UbQ_OxRdtase_chain4L/K.
DR   InterPro; IPR039428; NUOK/Mnh_C1-like.
DR   PANTHER; PTHR11434; PTHR11434; 1.
DR   Pfam; PF00420; Oxidored_q2; 1.
PE   3: Inferred from homology;
KW   Electron transport; Membrane; Mitochondrion; NAD; Respiratory chain;
KW   Translocase; Transmembrane; Transmembrane helix; Transport; Ubiquinone.
FT   CHAIN           1..98
FT                   /note="NADH-ubiquinone oxidoreductase chain 4L"
FT                   /id="PRO_0000118492"
FT   TRANSMEM        1..21
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        26..46
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        61..81
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   98 AA;  10487 MW;  3FD95387CD62689C CRC64;
     MSPVYFSFSS AFILGLMGLA FNRSHLLSAL LCLEGMMLSL FIAIALWSMT LNSTSCSITP
     MILLTFSACE ASAGLALLVA ATRTHGSDHL QNLNLLQC