4.1.1.112 3 6 - 4273 4.1.1.112 3.5 5 - 714979 4.1.1.112 3.5 5.5 pH 3.5: about 55% of maximal activity, pH 5.5: about 40% of maximal activity 664936 4.1.1.112 4.5 9 - 4283 4.1.1.112 6 8 - 4272 4.1.1.112 6 8.5 - 653877 4.1.1.112 6 9 - 4268 4.1.1.112 6.5 9.5 - 654328 4.1.1.112 7 10 - 4271