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Green AT, Moniruzzaman M, Cooper CJ, Walker JK, Smith JC, Parks JM, Zgurskaya HI. Discovery of multidrug efflux pump inhibitors with a novel chemical scaffold. Biochim Biophys Acta Gen Subj 2020; 1864:129546. [PMID: 32032658 DOI: 10.1016/j.bbagen.2020.129546] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 01/21/2020] [Accepted: 01/30/2020] [Indexed: 12/12/2022]
Abstract
Multidrug efflux is a major contributor to antibiotic resistance in Gram-negative bacterial pathogens. Inhibition of multidrug efflux pumps is a promising approach for reviving the efficacy of existing antibiotics. Previously, inhibitors targeting both the efflux transporter AcrB and the membrane fusion protein AcrA in the Escherichia coli AcrAB-TolC efflux pump were identified. Here we use existing physicochemical property guidelines to generate a filtered library of compounds for computational docking. We then experimentally test the top candidate coumpounds using in vitro binding assays and in vivo potentiation assays in bacterial strains with controllable permeability barriers. We thus identify a new class of inhibitors of E. coli AcrAB-TolC. Six molecules with a shared scaffold were found to potentiate the antimicrobial activity of erythromycin and novobiocin in hyperporinated E. coli cells. Importantly, these six molecules were also active in wild-type strains of both Acinetobacter baumannii and Klebsiella pneumoniae, potentiating the activity of erythromycin and novobiocin up to 8-fold.
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Affiliation(s)
- Adam T Green
- UT/ORNL Center for Molecular Biophysics, Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA; Graduate School of Genome Science and Technology, University of Tennessee, Knoxville, TN, 37996, USA
| | - Mohammad Moniruzzaman
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK 73019, USA
| | - Connor J Cooper
- UT/ORNL Center for Molecular Biophysics, Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA; Graduate School of Genome Science and Technology, University of Tennessee, Knoxville, TN, 37996, USA
| | - John K Walker
- Department of Pharmacology and Physiology, Saint Louis University School of Medicine and the Henry and Amelia Nasrallah Center for Neuroscience, Saint Louis, MO, 63104, USA
| | - Jeremy C Smith
- UT/ORNL Center for Molecular Biophysics, Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA; Graduate School of Genome Science and Technology, University of Tennessee, Knoxville, TN, 37996, USA; Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, TN 37996, USA
| | - Jerry M Parks
- UT/ORNL Center for Molecular Biophysics, Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA; Graduate School of Genome Science and Technology, University of Tennessee, Knoxville, TN, 37996, USA.
| | - Helen I Zgurskaya
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK 73019, USA.
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