An embedded lipid in the multidrug transporter LmrP suggests a mechanism for polyspecificity
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Multidrug efflux pumps present a challenge to the treatment of bacterial infections, making it vitally important to understand their mechanism of action. Here, we investigate the nature of substrate binding within Lactococcus lactis LmrP, a prototypical multidrug transporter of the major facilitator superfamily. We determined the crystal structure of LmrP in a ligand-bound outward-open state and observed an embedded lipid in the binding cavity of LmrP, an observation supported by native mass spectrometry analyses. Molecular dynamics simulations suggest that the anionic lipid stabilizes the observed ligand-bound structure. Mutants engineered to disrupt binding of the embedded lipid display reduced transport of some, but not all, antibiotic substrates. Our results suggest that a lipid within the binding cavity could provide a malleable hydrophobic component that allows adaptation to the presence of different substrates, helping to explain the broad specificity of this protein and possibly other multidrug transporters.
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AF2 modeled the multidrug transporter LmrP (CASP14 target T1024) in multiple conformations, two of which were individually consistent with published experimental data.
“Upon examining the list of CASP14 targets and corresponding models, we found that AF2 modeled the multidrug transporter LmrP (target T1024) in multiple conformations, two of which were individually consistent with published experimental data”
From Sampling alternative conformational states of transporters and receptors with AlphaFold2 (2022) · cites this paper as Debruycker et al., 2020
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- Authors
- Debruycker, V., Hutchin, A., Masureel, M., Ficici, E., Martens, C., Legrand, P., Stein, R. A., Mchaourab, H. S., Faraldo-Gómez, J. D., Remaut, H., & Govaerts, C.
- Affiliations
- Université Libre de Bruxelles (BE)
- National Institutes of Health (US)
- Synchrotron SOLEIL (FR)
- Vanderbilt University Medical Center (US)
- Vrije Universiteit Brussel (BE)
- Corresponding author
- Govaerts, Cédric
- ORCID
- Venue
- Nature Structural & Molecular Biology
- Published
- 2020-07-27
- Volume
- 27
- Issue
- 9
- Pages
- 829-835
- ISSN
- 1545-9985 (ISSN-L)
- 1545-9993
- PMC
- PMC7951658
- OpenAlex
- W3044291258
- Cited by
- 69
- References
- 67
- Citations by year
- 2026: 4 · 2025: 6 · 2024: 7 · 2023: 9 · 2022: 20 · 2021: 20 · 2020: 3
- FWCI
- 4.70
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Nature Structural & Molecular Biology (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Dépôt institutionnel de l'Université libre de Bruxelles (Université Libre de Bruxelles) (submittedVersion, other-oa)
- VUBIR (Vrije Universiteit Brussel) (submittedVersion)
- Funders
- Fonds De La Recherche Scientifique - FNRS (F.4523.12)
- National Institutes of Health
- Biotechnology and Biological Sciences Research Council (BB/M012573/1)
- Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture
- National Heart, Lung, and Blood Institute
- National Institute of General Medical Sciences (R01GM077659)
- NHLBI Division of Intramural Research
- Topics
- Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Medicine › Antibiotic Resistance in Bacteria
- Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
- Keywords
- multidrug efflux pumps, major facilitator superfamily, substrate-binding cavity, polyspecificity, antibiotic transport, Lactococcus lactis, crystal structure, molecular dynamics simulation, site-directed mutagenesis
- MeSH terms
- Anti-Bacterial Agents, Bacterial Proteins, Binding Sites, Biological Transport, Ligands, Phosphatidylglycerols, Protein Conformation, Lactococcus lactis, Substrate Specificity, Crystallography, X-Ray, Membrane Transport Proteins, Molecular Dynamics Simulation
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