4.3.1.19 L-serine - 4.3.1.19 L-Thr inducible enzyme 4.3.1.19 L-Thr constitutive enzyme 4.3.1.19 L-Thr first reaction of the Ile pathway 4.3.1.19 L-Thr key enzyme in biosynthesis of Ile 4.3.1.19 L-Thr the enzyme is an important element in the flux control of Ile biosynthesis 4.3.1.19 L-Thr isoleucine-insensitive enzyme is subject to glucose-mediated catabolite repression 4.3.1.19 L-Thr increase of activity under gluconeogenic conditions in adult-rat hepatocytes cultured on collagen gel/nylon mesh 4.3.1.19 L-Thr the enzyme is formed under anaerobic conditions, the enzyme is induced by L-Ser and L-Thr, cAMP is required for the synthesis of the enzyme 4.3.1.19 L-threonine -