Table 2.

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

SubstrateSST-KSRT-1SST-1
Km (μM)Relative VmaxaKm (μM)Relative VmaxaKm (μM)Ki (μM)Relative Vmaxa
Cephaloridine670100660100180b 100
Cefuroxime3703403303500.3<1
Cefotaxime3904004104102.8<1
Cefmenoxime1801201701301.7<1
Ceftazidime1802015020120<1
  • a Values relative to that for cephaloridine, which was set at 100.

  • b —, not tested.