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- * Respiratory-chain NADH dehydrogenase 30 Kd subunit signature *
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- Respiratory-chain NADH dehydrogenase (EC 1.6.5.3) [1,2] (also known as complex
- I or NADH-ubiquinone oxidoreductase) is an oligomeric enzymatic complex
- located in the inner mitochondrial membrane which also seems to exist in
- the chloroplast and in cyanobacteria (as a NADH-plastoquinone oxidoreductase).
- Among the 25 to 30 polypeptide subunits of this bioenergetic enzyme complex
- there is one with a molecular weight of 30 Kd (in mammals) which has been
- found to be:
-
- - Nuclear encoded, as a precursor form with a transit peptide in mammals, and
- in Neurospora crassa.
- - Mitochondrial encoded in Paramecium (protein P1), and in the slime mold
- Dictyostelium discoideum (ORF 209).
- - Chloroplast encoded in various higher plants (ORF 159).
-
- It is also present in bacteria:
-
- - In the cyanobacteria Synechocystis strain PCC 6803 (ORF 155).
- - Subunit C of Escherichia coli NADH-ubiquinone oxidoreductase (gene nuoC).
- - Subunit NQO5 of Paracoccus denitrificans NADH-ubiquinone oxidoreductase.
-
- This protein, in its mature form, consists of from 157 to 266 amino acid
- residues. The best conserved region is located in the C-terminal section and
- can be used as a signature pattern.
-
- -Consensus pattern: E-R-E-x(2)-[DE]-[LIVMF](2)-x(6)-[HK]-x(3)-[KR]-x-[LIVM](2)
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: June 1994 / Text revised.
-
- [ 1] Ragan C.I.
- Curr. Top. Bioenerg. 15:1-36(1987).
- [ 2] Weiss H., Friedrich T., Hofhaus G., Preis D.
- Eur. J. Biochem. 197:563-576(1991).
-