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Butler SM, Ercan B, You J, Schulz LP, Jolliffe KA. A change in metal cation switches selectivity of a phospholipid sensor from phosphatidic acid to phosphatidylserine. Org Biomol Chem 2024; 22:5843-5849. [PMID: 38957899 DOI: 10.1039/d4ob00418c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
Abstract
Phosphatidic acid and phosphatidylserine are anionic phospholipids with emerging signalling roles in cells. Determination of how phosphatidic acid and phosphatidylserine change location and quantity in cells over time requires selective fluorescent sensors that can distinguish these two anionic phospholipids. However, the design of such synthetic sensors that can selectively bind and respond to a single phospholipid within the complex membrane milieu remains challenging. In this work, we present a simple and robust strategy to control the selectivity of synthetic sensors for phosphatidic acid and phosphatidylserine. By changing the coordination metal of a dipicolylamine (DPA) ligand from Zn(II) to Ni(II) on the same synthetic sensor with a peptide backbone, we achieve a complete switch in selectivity from phosphatidic acid to phosphatidylserine in model lipid membranes. Furthermore, this strategy was largely unaffected by the choice and the position of the fluorophores. We envision that this strategy will provide a platform for the rational design of targeted synthetic phospholipid sensors to probe plasma and intracellular membranes.
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Affiliation(s)
- Stephen M Butler
- School of Chemistry, The University of Sydney, NSW, 2006, Australia.
- Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Sydney, NSW, 2006, Australia
| | - Bilge Ercan
- School of Chemistry, The University of Sydney, NSW, 2006, Australia.
- Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Sydney, NSW, 2006, Australia
| | - Jingyao You
- School of Chemistry, The University of Sydney, NSW, 2006, Australia.
- Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Sydney, NSW, 2006, Australia
| | - Luke P Schulz
- School of Chemistry, The University of Sydney, NSW, 2006, Australia.
| | - Katrina A Jolliffe
- School of Chemistry, The University of Sydney, NSW, 2006, Australia.
- Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Sydney, NSW, 2006, Australia
- The University of Sydney Nano Institute (Sydney Nano), The University of Sydney, NSW, 2006, Australia
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Nguyen D, Wu J, Corrigan P, Li Y. Computational investigation on lipid bilayer disruption induced by amphiphilic Janus nanoparticles: combined effect of Janus balance and charged lipid concentration. NANOSCALE 2023; 15:16112-16130. [PMID: 37753922 DOI: 10.1039/d3nr00403a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/28/2023]
Abstract
Janus nanoparticles (NPs) with charged/hydrophobic compartments have garnered attention for their potential antimicrobial activity. These NPs have been shown to disrupt lipid bilayers in experimental studies, yet the underlying mechanisms of this disruption at the particle-membrane interface remain unclear. To address this knowledge gap, the present study conducts a computational investigation to systematically examine the disruption of lipid bilayers induced by amphiphilic Janus NPs. The focus of this study is on the combined effects of the hydrophobicity of the Janus NP, referred to as the Janus balance, defined as the ratio of hydrophilic to hydrophobic surface coverage, and the concentration of charged phospholipids on the interactions between Janus NPs and lipid bilayers. Computational simulations were conducted using a coarse-grained molecular dynamics (MD) approach. The results of these MD simulations reveal that while the area change of the bilayer increases monotonically with the Janus balance, the effect of charged lipid concentration in the membrane is not easy to be predicted. Specifically, it was found that the concentration of negatively charged lipids is directly proportional to the intensity of membrane disruption. Conversely, positively charged lipids have a negligible effect on membrane defects. This study provides molecular insights into the significant role of Janus balance in the disruption of lipid bilayers by Janus NPs and supports the selectivity of Janus NPs for negatively charged lipid membranes. Furthermore, the anisotropic properties of Janus NPs were found to play a crucial role in their ability to disrupt the membrane via the combination of hydrophobic and electrostatic interactions. This finding is validated by testing the current Janus NP design on a bacterial membrane-mimicking model. This computational study may serve as a foundation for further studies aimed at optimizing the properties of Janus NPs for specific antimicrobial applications.
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Affiliation(s)
- Danh Nguyen
- Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.
| | - James Wu
- Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA
| | - Patrick Corrigan
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA
| | - Ying Li
- Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.
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Herschede SR, Salam R, Gneid H, Busschaert N. Bacterial cytological profiling identifies transmembrane anion transport as the mechanism of action for a urea-based antibiotic. Supramol Chem 2023. [DOI: 10.1080/10610278.2023.2178921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Affiliation(s)
- Sarah R. Herschede
- Department of Chemistry, Tulane University, New Orleans, Louisiana, United States
| | - Rayhanus Salam
- Department of Chemistry, Tulane University, New Orleans, Louisiana, United States
| | - Hassan Gneid
- Department of Chemistry, Tulane University, New Orleans, Louisiana, United States
| | - Nathalie Busschaert
- Department of Chemistry, Tulane University, New Orleans, Louisiana, United States
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Boles JE, Bennett C, Baker J, Hilton KLF, Kotak HA, Clark ER, Long Y, White LJ, Lai HY, Hind CK, Sutton JM, Garrett MD, Cheasty A, Ortega-Roldan JL, Charles M, Haynes CJE, Hiscock JR. Establishing the selective phospholipid membrane coordination, permeation and lysis properties for a series of 'druggable' supramolecular self-associating antimicrobial amphiphiles. Chem Sci 2022; 13:9761-9773. [PMID: 36091903 PMCID: PMC9400670 DOI: 10.1039/d2sc02630a] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Accepted: 08/03/2022] [Indexed: 01/19/2023] Open
Abstract
The rise of antimicrobial resistance remains one of the greatest global health threats facing humanity. Furthermore, the development of novel antibiotics has all but ground to a halt due to a collision of intersectional pressures. Herein we determine the antimicrobial efficacy for 14 structurally related supramolecular self-associating amphiphiles against clinically relevant Gram-positive methicillin resistant Staphylococcus aureus and Gram-negative Escherichia coli. We establish the ability of these agents to selectively target phospholipid membranes of differing compositions, through a combination of computational host:guest complex formation simulations, synthetic vesicle lysis, adhesion and membrane fluidity experiments, alongside our novel 1H NMR CPMG nanodisc coordination assays, to verify a potential mode of action for this class of compounds and enable the production of evermore effective next-generation antimicrobial agents. Finally, we select a 7-compound subset, showing two lead compounds to exhibit 'druggable' profiles through completion of a variety of in vivo and in vitro DMPK studies.
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Affiliation(s)
- Jessica E. Boles
- School of Chemistry and Forensics, University of KentCanterburyCT2 7NHUK,School of Biosciences, University of KentCanterburyCT2 7NJUK
| | | | | | - Kira L. F. Hilton
- School of Chemistry and Forensics, University of KentCanterburyCT2 7NHUK
| | - Hiral A. Kotak
- Chemistry Department, UCL20 Gordon StreetLondon WC1H 0AJUK
| | - Ewan R. Clark
- School of Chemistry and Forensics, University of KentCanterburyCT2 7NHUK
| | - Yifan Long
- Chemistry Department, UCL20 Gordon StreetLondon WC1H 0AJUK
| | - Lisa J. White
- School of Chemistry and Forensics, University of KentCanterburyCT2 7NHUK
| | - Hin Yuk Lai
- Chemistry Department, UCL20 Gordon StreetLondon WC1H 0AJUK
| | - Charlotte K. Hind
- Research and EvaluationPorton Down, UKHSA, Porton DownSalisbury SP4 0JGUK
| | - J. Mark Sutton
- Research and EvaluationPorton Down, UKHSA, Porton DownSalisbury SP4 0JGUK
| | | | - Anne Cheasty
- Cancer Research Horizons2 Redman PlaceLondonE20 1JQUK,ExscientiaThe Schrödinger Building, Heatley Road, Oxford Science ParkOxfordOX4 4GEUK
| | | | - Mark Charles
- Cancer Research Horizons2 Redman PlaceLondonE20 1JQUK
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