TABLE 2.

Values of kinetic parameters for SST-K, SRT-1, and SST-1

Substrate	SST-K		SRT-1		SST-1
	Km (μM)	Relative Vmaxa	Km (μM)	Relative Vmaxa	Km (μM)	Ki (μM)	Relative Vmaxa
Cephaloridine	670	100	660	100	180	—b	100
Cefuroxime	370	340	330	350	—	0.3	<1
Cefotaxime	390	400	410	410	—	2.8	<1
Cefmenoxime	180	120	170	130	—	1.7	<1
Ceftazidime	180	20	150	20	—	120	<1

^aValues relative to that for cephaloridine, which was set at 100. 

^b—, not tested.