Pyrene dodecanoic acid coenzyme A ester: peroxisomal oxidation and chain shortening

Pyrenedodecanoyl-CoA was beta-oxidized by isolated rat liver peroxisomes at a rate which was about 50% of that observed with palmitoyl-CoA. Measurement of the quantity of NADH formed from a limiting amount of pyrenedodecanoyl-CoA suggested that it was subjected to two to three cycles of beta-oxidation. Pyrenedodecanoyl-CoA was a very poor substrate for carnitine palmitoyltransferase, exhibiting less than 1% of the rate obtained with palmitoyl-CoA; it also was a strong inhibitor of this enzyme. With rat liver microsomal alpha-glycerophosphate acyltransferase the rate of reaction with pyrenedodecanoyl-CoA was only 3-4% of that observed with palmitoyl-CoA.