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An E461G mutation of β-galactosidase results in the disappearance of the high pL (L = H, D) downward break in the rate profiles for k cat /K m for wild-type enzyme-catalyzed hydrolysis of 4-nitrophenyl β-d-galactopyranoside (Gal-OPNP) and a decrease from (k cat ) HOH /(k cat ) DOD = 1.7 to (k cat ) HOH /(k cat ) DOD =...
A value of 1.8 has been determined for (K I ) HOH /(K I ) DOD , the ratio of the values of K I for competitive inhibition of β-galactosidase by isopropyl β-d-thiogalactopyranoside in H 2 O and D 2 O. This is similar to the value of 1.7 for (K m ) HOH /(K m ) DOD , the ratio of the Michaelis constants determined...
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