2.7.1.35 4.5 8.5 the enzyme is inactive below pH 4.5. Enzyme activity decreases slowly above pH 6.0, to approximately 35% at pH 8.5 722183 2.7.1.35 4.5 9.5 activity range, recombinant enzyme 759346 2.7.1.35 4.7 5.3 pH 4.7: about 60% of maximal activity, pH 5.3: about 40% of maximal activity 641403 2.7.1.35 5 5.7 pH 5.0: about 90% of maximal activity, pH 5.7: about 45% of maximal activity 641403 2.7.1.35 5 8 pH 5.0: about 70% of maximal activity, pH 8.0: about 50% of maximal activity 641425 2.7.1.35 6 7 pH 6.0: about 50% of maximal activity, pH 7.0: about 50% of maximal activity 641403