Table 2. Kinetic parameters of KpHIUH.

	k cat (s1)	K m (M)	k cat/K m (M 1s1)
Native KpHIUH	172 2	103 2	1.7 106
H7N	0.8 0.09	4400 500	1.8 102
R41K	34.7 0.4	195 3	1.8 105
H92N	0.35 0.01	430 10	8.2 102
S108A	81 0.7	93 2	8.7 105