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pD-Rate profiles for the first-order rate constants kex (s−1) for exchange for deuterium of the C-6 proton of enzyme-bound F-UMP and UMP catalyzed by ScOMPDC in D2O at 25 °C and I = 0.1 (NaCl). The solid lines show the fits of the data to eq 7. A. Data for F-UMP which give pKES = 7.1 ± 0.1 and (kex)max = 0.041 s−1. B. Data for UMP which give pKES = 8.0 ± 0.1 and (kex)max = 1.2 × 10−5 s−1.
