Convergent QacR mutant E90Q and wild type QacR drug-binding sites.Superimposition of the structures of the multidrug-binding pockets of wild type QacR-malachite green (MG; light blue ribbon), QacR(E90Q)-ethidium (Et; pink ribbon), and QacR(E90Q)-rhodamine 6G (R6G; yellow ribbon) structures. Helices containing drug-interacting residues are labelled in black.
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