TABLE 3.

Summary of mass spectrometry data obtained after preincubation of Ldt_Mt5 and different carbapenems

Enzyme	Carbapenem	Calculated mass of inhibited species	Mass of carbapenem	Observed massa
		Da	Da	Da
LdtMt5	None	42,603		42,605
	Meropenem	42,986.5	383.5	42,605
	Imipenem	42,902.4	299.4	42,605
	Doripenem	43,023.1	420.1	42,604
	Biapenem	42,953.4	350.4	42,606
	Tebipenem	42,986.5	383.5	42,605
N358H/M346W LdtMt5	None	42,681		42,683
	Meropenem	43,064.5	383.5	42,684
	Imipenem	42,980.4	299.4	42,683
	Doripenem	43,101.1	420.1	42,683
	Biapenem	43,031.4	350.4	42,683
	Tebipenem	43,064.5	383.5	42,684

^a Reported masses are those that comprise the largest species in the mass spectrum at 100% abundance.