Table 1.
Fraction | Total protein (mg) | Total activitya (units) | Specific activityb (units/mg protein) | Purification (fold) | Yield (%) | |
---|---|---|---|---|---|---|
I | Total lysate | 3.5 | 3.1 × 103 | 8.7 × 102 | 1.0 | 100 |
II | 25–50% (NH4)2SO4 pptc | 2.6 | 1.7 × 103 | 6.8 × 102 | 0.78 | 57 |
III | Anion exchange HPLC | 2.3 × 10−1 | 1.6 × 103 | 7.0 × 103 | 8.0 | 52 |
IV | 0–50% (NH4)2SO4 ppt | 6.0 × 10−2 | 4.7 × 102 | 8.4 × 103 | 9.7 | 16 |
V | Gel filtration HPLC | 2.0 × 10−2 | 1.8 × 102 | 1.2 × 104 | 14 | 6 |
Total activity was calculated as 1 unit corresponding to activity that yields 70% cell viability.
Specific activity indicates total activity divided by total protein.
ppt: precipitate.