2.4.1.13 9.5 - about 10-15% of maximum activity 720939 2.4.1.13 6.2 6.6 96% of maximal activity at pH 6.2 and 6.6 488560 2.4.1.13 5.5 7.5 over 40% of maximal enzyme activity within this range 735556 2.4.1.13 5 8 about half-maximal activity at pH 5.0 and 8.0, sucrose cleavage 488558 2.4.1.13 5 8 isoform SUS1 shows about 60% activity at pH 5.0, 100% activity at pH 5.5, about 90% activity at pH 6.5, about 40% activity at pH 7.5, and about 33% activity at pH 8.0. Isoform SUS2 shows about 50% activity at pH 5.0, 100% activity at pH 5.5, about 95% activity at pH 6.5, about 90% activity at pH 7.5, and about 70% activity at pH 8.0 757047 2.4.1.13 5 8.2 about 90% of maximal activity at pH 5.0 and about half-maximal activity at pH 8.2, sucrose cleavage 488555 2.4.1.13 5.5 9 about 80% of maximal activity at pH 5.5 and about half-maximal activity at pH 9.0, sucrose cleavage 488550 2.4.1.13 7 9 sucrose cleavage, activities with CDP, GDP, TDP, and UDP only occur at pH 7.0-8.0 and are very low at pH 9.0, while the activity with ADP is highest at pH 8.0 and higher than 60% of maximal activity in the pH range of 7.0-9.0 736101 2.4.1.13 5 10 about half-maximal activity at pH 5.0 and 10.0, sucrose synthesis 488558 2.4.1.13 5.6 10 about half-maximal activity at pH 5.6 and about 90% of maximal activity at pH 10.0, sucrose synthesis 488550