J. Biol. Chem., Vol. 259, Issue 4, 2031-2034, 02, 1984

Molecular cloning of cDNA for rat acyl-CoA oxidase

T Osumi, H Ozasa and T Hashimoto

Poly(A+) RNA was prepared from hepatic free polysomes of rats which had been fed di(2-ethylhexyl) phthalate for the induction of peroxisomal beta-oxidation enzymes. This preparation was enriched for the mRNAs of these enzymes by sucrose density gradient centrifugation, and used for the synthesis of double-stranded cDNA. Recombinant plasmids were constructed from the cDNA and pBR322 by dG X dC-tailing method and used for the transformation of an Escherichia coli strain, chi 1776. By differential colony hybridization using [32P]cDNA of partially purified liver poly(A+) RNA from induced and noninduced rats as probes, and then by hybridization-selected translation, we obtained two clones with cDNA inserts which specifically selected acyl-CoA oxidase mRNA. On Northern blotting, both cDNA inserts hybridized to 3.8-kilobase RNA which was increased about 10-fold by di(2-ethylhexyl) phthalate treatment of the rats. The cleavage maps of the cDNA inserts showed they overlap with each other. We conclude that the above two recombinant plasmid clones contain cDNA sequences for rat acyl-CoA oxidase.
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