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A lambda gt10 bovine brain and a lambda gt11 bovine heart cDNA library were screened with oligonucleotide probes corresponding to partial protein sequences directly determined from the isolated 51-kDa subunit of the bovine respiratory-chain NADH dehydrogenase. Clones were isolated that encode a protein of 464 amino acids containing all the 11 partial tryptic peptide sequences determined from the 51-kDa subunit. The size and amino acid composition of this protein agree with those determined for the purified 51-kDa subunit. Furthermore, this protein contains a putative NADH-binding domain, a possible FMN-binding site, and a putative binding site for an iron-sulfur cluster. The above evidence indicates that the cloned protein is the 51-kDa subunit or its precursor. A search for sequence similarity with proteins in the Protein Identification Resource data base has revealed that the 51-kDa subunit has 32% amino acid sequence identity with a major portion of the alpha subunit of the soluble NAD(+)-reducing hydrogenase from Alcaligenes eutrophus. In particular, there are three segments of high sequence similarity (70-88%) between the two proteins which correspond to the three ligand-binding sites.

proceedings of the national academy of sciences of the united states of america

cDNA-derived amino acid sequence of the NADH-binding 51-kDa subunit of the bovine respiratory NADH dehydrogenase reveals striking similarities to a bacterial NAD(+)-reducing hydrogenase.