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Initial-rate parameters for WT and spin-labeled SULT1A3 mutants
| Enzyme | kcat, min−1 | Km, nM | Ki THB, nM |
| WT | 120 (17) | 22 (3.1) | 23 (1.5) |
| 26* | 110 (15) | 25 (3.5) | 25 (2.7) |
| 151 | 115 (16) | 26 (2.2) | 20 (2.2) |
| 234 | 109 (15) | 24 (3.2) | 22 (1.6) |
Values in parentheses indicate SD.
Cys residue at which spin label is attached.
