Carnitine palmitoyltransferase I also known as carnitine acyltransferase I, CPTI, CAT1, CoA:carnitine acyl transferase, or palmitoylCoA transferase I, is a mitochondrial enzyme responsible for the formation of acyl carnitines by catalyzing the transfer of the acyl group of a long-chain fatty acyl-CoA from coenzyme A to l-carnitine. Wikipedia