cDNA cloning and amino acid sequence of human mitochondrial Δ3Δ2-enoyl-CoA isomerase: comparison of the human enzyme with its rat counterpart, mitochondrial short-chain isomerase

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Abstract
We report the isolation of a cDNA encoding a mature human monofunctional delta 3 delta 2-enoyl-CoA isomerase and the determination of its nucleotide sequence. The purified uncleaved protein, as well as several internal tryptic and CNBr fragments, were subjected to N-terminal peptide sequencing. The deduced amino acid sequence of the mature protein consists of 260 amino acids with a predicted M(r) of 28735. The human mitochondrial isomerase exhibits a 74% (78%) sequence identity with the corresponding rat counterpart at amino acid (nucleotide) level(s). Many basic amino acid residues in rat isomerase have been changed to acidic or neutral residues in human enzyme, explaining the differences observed between these proteins.

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