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. 2022 May 13;5:459. doi: 10.1038/s42003-022-03384-y

Fig. 1. Sequence alignment of E. coli DHFR (EcDHFR) with DfrA1 and DfrA5.

Fig. 1

Variations in the Met20 loop (blue), F-G loop (green), and G-H loop (red) are not only responsible for trimethoprim resistance, but also explain differences in steady-state kinetics. Notable active site variations (*) are directly involved in trimethoprim resistance.