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Evaluation of the putative structures of MexB mutants. (a to e) Modeled closeup views of the inhibitor-binding pit of ABI-PP-bound MexB mutants I277W (a), A279W (b), V612W (c), V139W (d), and V571W (e). These binding-pits are shown as solvent accessible surface, except for the tryptophan. ABI-PP and tryptophan side chains are shown by stick and space-filling model, respectively. The carbon atoms of ABI-PP and mutated tryptophan are indicated in yellow and white, respectively.
