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Updated: Jan 7, 2026
09:12
Selection of Transporter-Targeted Inhibitory Nanobodies by Solid-Supported-Membrane SSM-Based Electrophysiology
Published on: May 3, 2021
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Energetic and structural control of polyspecificity in a multidrug transporter
Silas T Miller1,2,3, Katherine A Henzler-Wildman3, Srivatsan Raman2,3,4,5
1Cellular and Molecular Biology Graduate Program, University of Wisconsin-Madison, Madison, WI 53706.
Summary
Multidrug efflux pumps confer antibiotic resistance. This study reveals that efficient pumps transport more drugs, linking energy coupling to broad substrate recognition and resistance mechanisms.
Area of Science:
- Biochemistry
- Molecular Biology
- Microbiology
Background:
- Multidrug efflux pumps are crucial in antibiotic resistance.
- Understanding their substrate promiscuity and energy efficiency is vital for clinical applications.
Purpose of the Study:
- To investigate the molecular basis of multidrug efflux pump substrate recognition and energy efficiency.
- To deconvolute contributions of binding, coupling, and stability to transport.
Main Methods:
- Multiparametric deep mutational scanning across eight substrates.
- Utilized two energy conditions and a pH-based selection scheme.
- Integrated data to analyze substrate specificity, efficiency, and promiscuity.
Main Results:
- Substrate specificity involves a distributed network of residues beyond the binding site.
- Mutations impact binding, coupling, flexibility, and membrane interactions.
- A direct correlation exists: higher efficiency correlates with broader substrate profiles.
Conclusions:
- Energy coupling is fundamentally linked to polyspecificity in multidrug efflux.
- This work elucidates the biochemical logic governing multidrug transport.
- Findings offer insights into combating antibiotic resistance.
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