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Based on the primary structure of the rat peroxisomal 2,4-dienoyl-CoA reductase (M. Fransen, P.P. Van Veldhoven, S. Subramani, Biochem. J. 340 (1999) 561–568), the cDNA of the human counterpart was cloned. It contained an open reading frame of 878 bases encoding a protein of 291 amino acids (calculated molecular mass 30 778 Da), being 83% identical to the rat reductase. The gene, encompassing nine exons, is located at chromosome 16p13. Bacterially expressed poly(His)-tagged reductase was active not only towards short and medium chain 2,4-dienoyl-CoAs, but also towards 2,4,7,10,13,16,19-docosaheptaenoyl-CoA. Hence, the reductase does not seem to constitute a rate limiting step in the peroxisomal degradation of docosahexaenoic acid. The reduction of docosaheptaenoyl-CoA, however, was severely decreased in the presence of albumin. |
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