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. 2021 Jan 20;7:616490. doi: 10.3389/fmed.2020.616490

Table 2.

Kinetics of minor carbapenemases.

Class A Class B Class C Class D
Substrates Kcat (s-1)
NMC-A IMI-1 FRI-1 BKC-1 CTX-M-33 SHV-38 GES-5 SME-1 SFC-1 GIM-1 AIM-1 TMB-1 KHM-1 ACT-28 CMY-10 OXA-23 OXA-40 OXA-58 OXA-198 OXA-372
Benzylpenicillin 260 36 1,060 34.2 210 100 317 19.3 6.6 778 23 70 3.06 5 5.5 15 40
Amoxicillin 816 190 >17,000 215 1,800 181
Ticarcillin 81 120 1.6 7.5 10 2.3 5 1 110
Piperacillin 6.1 >26,00 205 100 4 6.9 337 3.3 1 2.5 2.6
Oxacillin 14,306 2 1.5 25 145
Nitrocefin 22.4 5.8
Cephalothin 118.4 380 5 49.7 16 529 384 3 0.1 0.19 0.17
Cephaloridine 40 190 686
Cefoxitin NH 9.6 8.3 145 0.3 1,178
Cefotaxime 286 3.4 >220 0.4 620 1 2.9 <0.98 8.3 1.1 609 2,181 0.07 NH NH NH NH
Ceftazidime NH <0.01 NH 0.1 0.35 110 0.3 2.1 18 7 0.07 118 0.1 5.0 20 NH NH NH
Cefepime 28 1.69 70 3 17 93 NH NH NH NH
Aztreonam 707 51 >8,300 2.2 10 3 108 162 NH NH NH NH NH NH NH NH
Imipenem 1,040 89 1,790 0.03 <0.01 0.01 1.2 104 54 27 1,700 1.7 15 0.025 1.6 0.35 0.1 0.1 0.1 5.8
Meropenem 12 10 46 0.003 0.13 8.9 6.5 2.7 1,000 1.4 0.4 0.068 NH <0.01 0.01 0.13
Ertapenem 150 0.002 <0.01 0.4 0.021 0.49
Km (uM)
Benzylpenicillin 28 64 567 78.7 20 13 370 16.7 46 31 1,340 36 20.5 23 50 14 110
Amoxicillin 90 780 >5,000 160 35 488
Ticarcillin 152 393 32.7 40 14(Ki) 57 60 240 190
Piperacillin 13 >3,000 140 80 454 69 17 72 23 50 35
Oxacillin 267.3 876 70 30 125
Nitrocefin 20.9 12
Cephalothin 30 100 577 22 38 138 72 150 0.19 57
Cephaloridine 150 506 4.4
Cefoxitin 206 26 69 81
Cefotaxime 956 190 >5,000 223.9 215 800 341 NH 89 4 49 13 3.8 NH NH NH NH
Ceftazidime NH 270 NH 92.9 1,500 3,800 394 NH 52 31 148 31 8 306 33.9 2,500 NH NH NH
Cefepime 3,400 174.3 100 1,600 431 594 NH NH NH NH
Aztreonam 125 93 >5,000 1200.7 60 5,500 259 484 NH NH NH NH NH NH NH
Imipenem 92 170 1,614 4.4 0.2 (Ki) 24 4.2 202 82 287 97 200 268 1.9 11.4 4.8 6.5 7.5 0.15 26
Meropenem 4.4 26 70 1.5 90 13.4 26 25 163 75 12 <1 NH 0.075 0.006 0.7
Ertapenem 98 1.7 0.009 (Ki) 31 0.5 0.25
Kcat/Km (uM/s)
Benzylpenicillin 9.3 0.6 1.9 0.4 10 7.7 0.9 1.2 0.14 26 0.017 1.9 0.14 0.22 0.11 1.07 2.8
Amoxicillin 9.1 0.2 3.4 1.35 51 0.4
Ticarcillin 0.5 0.3 0.05 0.2 0.7 0.04 0.02 0.004
Piperacillin 0.5 0.9 1.5 1.3 0.009 0.1 20 0.12 0.05 0.05 0.07 0.58
Oxacillin 53.5 0.002 0.83 1.2
Nitrocefin 1.1 0.47
Cephalothin 12.5 0.05 0.09 0.72 14 2.8 0.05 0.001 0.02 0.003
Cephaloridine 0.27 0.4 155.9
Cefoxitin 0.04 57 0.004 14.5
Cefotaxime 0.3 0.02 0.04 0.002 3 0.001 0.009 NH 0.09 0.24 12 167.8 0.02 NH NH NH
Ceftazidime 0.05 0.00002 NH 0.001 0.0003 0.03 0.0007 NH 0.04 0.58 0.0005 0.002 14.8 0.0003 0.15 0.01 NH NH
Cefepime 0.008 0.01 0.7 0.002 0.04 0.16 NH NH NH
Aztreonam 5.6 0.5 1.7 0.002 0.2 0.0005 0.4 0.004 NH NH NH NH NH NH NH
Imipenem 11 0.5 1.1 0.007 0.0005 0.3 0.5 0.7 0.09 17.5 0.009 0.06 0.013 0.14 0.07 0.015 0.014 0.67 0.22
Meropenem 2.7 0.4 0.7 0.002 0.0014 0.6 0.3 0.11 6,1 0.019 0.03 >0.06 NH <0.0002 1.67 0.52
Ertapenem 1.5 0.013 0.04 0.7

NH, Not Hydrolyzed.