Enzyme | pH optima | Apparent pKa |
Wild-type | ~5.0/9.0 | ~4.5; 5.5; 6.5; ~9.0 |
E40H | 6.0 - 8.0 | ~5.5 |
E44H | 6.0 - 8.0 | ~5.5 |
E40H/E44H | 7.5 - 10.0 | ~7.0 |
D186H | 6.5 - 8.0 | ~6.5 |
D186N | 5.5 - 12 | ~5.5 |