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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 
 

Structural features of the 66-kDa subunit of the energy-transducing NADH-ubiquinone oxidoreductase (NDH-1) of Paracoccus denitrificans.

The structural gene of the Paracoccus denitrificans NADH-ubiquinone oxidoreductase encoding a homologue of the 75-kDa subunit of bovine complex I (NQO3) has been located and sequenced. It is located approximately 1 kbp downstream of the gene coding for the NADH-binding subunit (NQO1) [Xu, X., Matsuno-Yagi, A., and Yagi, T. (1991) Biochemistry 30, 6422-6428] and is composed of 2019 base pairs and codes for 673 amino acid residues with a calculated molecular weight of 73,159. The M(r) 66,000 polypeptide of the isolated Paracoccus NADH dehydrogenase complex is assigned the NQO3 designation on the basis of N-terminal protein sequence analysis, amino acid analysis, and immuno-cross-reactivity. The encoded protein contains a putative tetranuclear iron-sulfur cluster (probably cluster N4) and possibly a binuclear iron-sulfur cluster. An unidentified reading frame (URF3) which is composed of 396 base pairs and possibly codes for 132 amino acid residues was found between the NQO1 and NQO3 genes. When partial DNA sequencing of the regions downstream of the NQO3 gene was performed, sequences homologous to the mitochondrial ND-1, ND-5, and ND-2 gene products of bovine complex I were found, suggesting that the gene cluster carrying the Paracoccus NADH dehydrogenase complex contains not only structural genes encoding water-soluble subunits but also structural genes encoding hydrophobic subunits.[1]

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