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Identification of an Inhibitor of the Aminoglycoside 6'-N-Acetyltransferase type Ib [AAC(6')-Ib] by Glide Molecular Docking.
MedChemComm 2016 January 2
The aminoglycoside 6'-N-acetyltransferase type Ib, AAC(6')-Ib, confers resistance to clinically relevant aminoglycosides and is the most widely distributed enzyme among AAC(6')-I-producing Gram-negative pathogens. An alternative to counter the action of this enzyme is the development of inhibitors. Glide is a computational strategy for rapidly docking ligands to protein sites and estimating their binding affinities. We docked a collection of 280,000 compounds from 7 sub-libraries of the Chembridge library as ligands to the aminoglycoside binding site of AAC(6')-Ib. We identified a compound, 1-[3-(2-aminoethyl)benzyl]-3-(piperidin-1-ylmethyl)pyrrolidin-3-ol (compound 1), that inhibited the acetylation of aminoglycosides in vitro with IC50 values of 39.7 and 34.9 µM when the aminoglycoside substrates assayed were kanamycin A or amikacin, respectively. The growth of an amikacin-resistant Acinetobacter baumannii clinical strain was inhibited in the presence of a combination of amikacin and compound 1.
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