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HMDB Protein ID HMDBP00189
Secondary Accession Numbers
  • 5421
  • HMDBP03469
Name NADH-ubiquinone oxidoreductase chain 6
  1. NADH dehydrogenase subunit 6
Gene Name MT-ND6
Protein Type Unknown
Biological Properties
General Function Involved in NADH dehydrogenase (ubiquinone) activity
Specific Function Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) that is believed to belong to the minimal assembly required for catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone (By similarity).
  • Oxidative phosphorylation
  • Parkinson's disease
NADH + Coenzyme Q10 → NAD + QH(2) details
QH2 + Acceptor → Ubiquinone-2 + Reduced acceptor details
GO Classification
Biological Process
small molecule metabolic process
mitochondrial electron transport, NADH to ubiquinone
response to hydrogen peroxide
Cellular Component
mitochondrial respiratory chain complex I
integral to membrane
catalytic activity
nadh dehydrogenase activity
nadh dehydrogenase (quinone) activity
nadh dehydrogenase (ubiquinone) activity
oxidoreductase activity
oxidoreductase activity, acting on nadh or nadph
Molecular Function
NADH dehydrogenase (ubiquinone) activity
metabolic process
oxidation reduction
Cellular Location
  1. Multi-pass membrane protein (Potential)
  2. Mitochondrion membrane
Gene Properties
Chromosome Location Not Available
Locus Not Available
Gene Sequence
>525 bp
Protein Properties
Number of Residues 174
Molecular Weight 18622.045
Theoretical pI 4.206
Pfam Domain Function
Signals Not Available
Transmembrane Regions Not Available
Protein Sequence
>NADH-ubiquinone oxidoreductase chain 6
GenBank ID Protein 13015
UniProtKB/Swiss-Prot ID P03923
UniProtKB/Swiss-Prot Entry Name NU6M_HUMAN
PDB IDs Not Available
GenBank Gene ID V00662
GeneCard ID MT-ND6
GenAtlas ID MT-ND6
General References
  1. Anderson S, Bankier AT, Barrell BG, de Bruijn MH, Coulson AR, Drouin J, Eperon IC, Nierlich DP, Roe BA, Sanger F, Schreier PH, Smith AJ, Staden R, Young IG: Sequence and organization of the human mitochondrial genome. Nature. 1981 Apr 9;290(5806):457-65. [PubMed:7219534 ]
  2. Horai S, Hayasaka K, Kondo R, Tsugane K, Takahata N: Recent African origin of modern humans revealed by complete sequences of hominoid mitochondrial DNAs. Proc Natl Acad Sci U S A. 1995 Jan 17;92(2):532-6. [PubMed:7530363 ]
  3. Moilanen JS, Finnila S, Majamaa K: Lineage-specific selection in human mtDNA: lack of polymorphisms in a segment of MTND5 gene in haplogroup J. Mol Biol Evol. 2003 Dec;20(12):2132-42. Epub 2003 Aug 29. [PubMed:12949126 ]
  4. Ingman M, Kaessmann H, Paabo S, Gyllensten U: Mitochondrial genome variation and the origin of modern humans. Nature. 2000 Dec 7;408(6813):708-13. [PubMed:11130070 ]
  5. Ingman M, Gyllensten U: Mitochondrial genome variation and evolutionary history of Australian and New Guinean aborigines. Genome Res. 2003 Jul;13(7):1600-6. [PubMed:12840039 ]
  6. Coble MD, Just RS, O'Callaghan JE, Letmanyi IH, Peterson CT, Irwin JA, Parsons TJ: Single nucleotide polymorphisms over the entire mtDNA genome that increase the power of forensic testing in Caucasians. Int J Legal Med. 2004 Jun;118(3):137-46. Epub 2004 Feb 4. [PubMed:14760490 ]
  7. Marzuki S, Noer AS, Lertrit P, Thyagarajan D, Kapsa R, Utthanaphol P, Byrne E: Normal variants of human mitochondrial DNA and translation products: the building of a reference data base. Hum Genet. 1991 Dec;88(2):139-45. [PubMed:1757091 ]
  8. Johns DR, Neufeld MJ, Park RD: An ND-6 mitochondrial DNA mutation associated with Leber hereditary optic neuropathy. Biochem Biophys Res Commun. 1992 Sep 30;187(3):1551-7. [PubMed:1417830 ]
  9. De Vries DD, Went LN, Bruyn GW, Scholte HR, Hofstra RM, Bolhuis PA, van Oost BA: Genetic and biochemical impairment of mitochondrial complex I activity in a family with Leber hereditary optic neuropathy and hereditary spastic dystonia. Am J Hum Genet. 1996 Apr;58(4):703-11. [PubMed:8644732 ]
  10. Sudoyo H, Sitepu M, Malik S, Poesponegoro HD, Marzuki S: Leber's hereditary optic neuropathy in Indonesia: two families with the mtDNA 11778G>A and 14484T>C mutations. Hum Mutat. 1998;Suppl 1:S271-4. [PubMed:9452107 ]
  11. Ozawa T, Tanaka M, Sugiyama S, Ino H, Ohno K, Hattori K, Ohbayashi T, Ito T, Deguchi H, Kawamura K, et al.: Patients with idiopathic cardiomyopathy belong to the same mitochondrial DNA gene family of Parkinson's disease and mitochondrial encephalomyopathy. Biochem Biophys Res Commun. 1991 May 31;177(1):518-25. [PubMed:2043137 ]
  12. Jun AS, Brown MD, Wallace DC: A mitochondrial DNA mutation at nucleotide pair 14459 of the NADH dehydrogenase subunit 6 gene associated with maternally inherited Leber hereditary optic neuropathy and dystonia. Proc Natl Acad Sci U S A. 1994 Jun 21;91(13):6206-10. [PubMed:8016139 ]
  13. Leo-Kottler B, Christ-Adler M, Baumann B, Zrenner E, Wissinger B: Leber's hereditary optic neuropathy: clinical and molecular genetic results obtained in a family with a new point mutation at nucleotide position 14498 in the ND 6 gene. Ger J Ophthalmol. 1996 Jul;5(4):233-40. [PubMed:8854108 ]
  14. Besch D, Leo-Kottler B, Zrenner E, Wissinger B: Leber's hereditary optic neuropathy: clinical and molecular genetic findings in a patient with a new mutation in the ND6 gene. Graefes Arch Clin Exp Ophthalmol. 1999 Sep;237(9):745-52. [PubMed:10447650 ]
  15. Chinnery PF, Brown DT, Andrews RM, Singh-Kler R, Riordan-Eva P, Lindley J, Applegarth DA, Turnbull DM, Howell N: The mitochondrial ND6 gene is a hot spot for mutations that cause Leber's hereditary optic neuropathy. Brain. 2001 Jan;124(Pt 1):209-18. [PubMed:11133798 ]
  16. Ravn K, Wibrand F, Hansen FJ, Horn N, Rosenberg T, Schwartz M: An mtDNA mutation, 14453G-->A, in the NADH dehydrogenase subunit 6 associated with severe MELAS syndrome. Eur J Hum Genet. 2001 Oct;9(10):805-9. [PubMed:11781695 ]