mitochondrial fatty acid beta-oxidation multienzyme complex A complex that includes the long-chain 3-hydroxyacyl-CoA dehydrogenase and long-chain enoyl-CoA hydratase activities in two subunits (alpha and beta), catalyzing two steps of the fatty acid beta-oxidation cycle within the mitochondrial matrix. GO:0016507 cellular_component fatty acid beta-oxidation multienzyme complex go.owl pro.owl trifunctional enzyme fatty acid beta-oxidation multienzyme complex mitochondrial part