Dr Evelyne Deplazes
About me
I am a biophysical and computational chemist with a passion for the molecular world. My research and teaching are driven by my innate curiosity and my love for solving puzzles.
After a double degree in Chemistry and Computer Science (2003-2007), I received my PhD in Computational Biophysics from the University of Western (2012). I then spent four years as an Early Career Research Fellow at The University of Queensland and two years at Curtin University, funded by the Swiss National Science Foundation and the Australian National Health and Medical Research Council (NHMRC). In 2019, I started my independent research group at the University of Technology Sydney, which I now continue after returning to The University of Queensland in 2021.
Apart from my research, I am a passionate advocate for mental health in academia and supporting PhD students. My teaching and supervision are guided by encouraging students to become 'critical thinkers'. I practice mindful leadership and aim to integrate kindness and gratitude into how I lead my research team.
Research Focus and Collaborations
The research in my lab combines computer simulations and biophysical chemistry experiments to study biomolecular systems with a particular focus on understanding how small molecules interact with biological membranes. We aim to use the knowledge and tools from our research to help develop new pharmaceuticals or understand fundamental processes such as membrane permeation. In addition, we are interested in studying the structure and function of proteins.
We collaborate with peptide chemists, microbiologists, and cell biologists to link our model systems to cell-based systems. This video and our recent outreach article tell you more about why cell membranes are important for understanding biological processes or developing new drugs.
Antifungal peptides
Invasive fungal infections are difficult to treat, and many current drugs are toxic to human cells. This project studies the membrane-altering properties of peptides or steroid drugs that have antifungal activity or that increase the potency of existing anti-fungal drugs. Understanding the mechanism of action of these compounds will help develop less toxic antifungal treatments. This project is a collaboration with fungal biologists and combines biophysical chemistry and cell-based experiments.
Ex-vivo and in-silico structural models of fungal cell membranes and cell walls
Targets for developing antifungal drugs are limited due to the similarity between fungal and human cells and most antifungal drugs work by interfering with the cell wall or cell membrane. Lipid vesicles or other model membrane systems are regularly used to study drug-membrane interactions, but these model systems are too simplistic to capture the complexity of the cell membrane or wall. This project aims to develop ex-vivo membrane models that better capture drug-membrane interactions. We do this using both biophysical chemistry approaches and computer simulations (in-silico).
What drives the haemolytic activity of antimicrobial peptides
The rise of antibiotic resistance has renewed the interest in antimicrobial peptides with complex, membrane-based mechanisms. While AMPs have potent antibiotic activity, most of them are also haemolytic (they rupture red blood cells). This project aims to use lipid extracts from cells to develop membrane models that more accurately mimic the haemolytic activity of AMPs and help identify what properties give a peptide potent antibiotic activity yet would be safe to use in humans.
Steroid – membrane interactions
Steroids are a class of chemical compounds that occur naturally in the body (e.g. progesterone or testosterone) and are also used to treat a range of conditions such as asthma, eczema or arthritis. Steroids exert their biological or pharmacological activities via a range of different mechanisms, including altering the structure and fluidity of cell membranes. We combine computer simulations and various wet-lab experiments to understand how steroids interact with membranes and how this might be used to modulate the function of membrane proteins.
Techniques you learn in our group may include fluorescence and UV-vis spectroscopy, isothermal calorimetry, Tethered lipid bilayer membranes (see this video), molecular dynamics simulations.
Competitive Access to Research Infrastructure
2024 Australian Centre for Neutron Scattering (beam-time, in-kind value $82,784).
CIA Ms Hartman (UTS, PhD student), CIB Dr Deplazes (UQ), CIC Dr Cranfield (UTS),
CID Dr Holt (ANSTO), CIE Dr Russell (ANSTO).
Project title: Investigating the synergy of a Lactoferrin-derived peptide and the anti-fungal drug
Amphotericin B
2023 Australian Centre for Neutron Scattering (beam time, in-kind value $33,122).
CIA Ms Hartman (UTS, PhD student), CIB Dr Deplazes (UQ), CIC Dr Cranfield (UTS),
CID Dr Holt (ANSTO), CIE Dr Russell (ANSTO)
Project title: Investigating the synergy of a Lactoferrin-derived peptide and the anti-fungal drug
Amphotericin B
2023/2024 National Computing Merit Allocation Scheme (Lead-CI)
UQ. 1,000,000 CPU-hours - $40,000
Project title: Towards realistic models of permeability and pore formation in biological membranes
2022/2023 National Computing Merit Allocation Scheme (Lead-CI)
UQ. 1,500,000 CPU-hours - $60,000
Project title: Towards realistic models of permeability and pore formation in biological membranes
2021/2022 National Computing Merit Allocation Scheme (Lead-CI)
UQ. 2,000,000 CPU-hours - $80,000
Project title: Towards realistic models of permeability and pore formation in biological membranes
Featured Publications
Phenolic compounds alter the ion permeability of phospholipid bilayers via specific lipid interactions
Hossain, Sheikh I., Saha, Suvash C., Deplazes, Evelyne, (2021). Phenolic compounds alter the ion permeability of phospholipid bilayers via specific lipid interactions. Biophysical Journal, 23, 22352-22366. doi: 10.1039/D1CP03250J
A charge-neutral organic cage selectively binds strongly hydrated sulfate anions in water
Jing Liuyang, Deplazes Evelyne, Clegg Jack K, Wu Xin, (2024), A charge-neutral organic cage selectively binds strongly hydrated sulfate anions in water. Nature Chemistry, 16, 335-342. doi: 10.1038/s41557-024-01457-5
Structural Characterization of a Cation-Selective, Self-Assembled Peptide Pore in Planar Phospholipid Bilayers
Deplazes, Evelyne, Hartmann, Lissy M., Cranfield, Charles G. and Garcia, Alvaro (2020). Structural Characterization of a Cation-Selective, Self-Assembled Peptide Pore in Planar Phospholipid Bilayers. Journal of Physical Chemistry Letters, 11 (19), 8152-8156. doi: 10.1021/acs.jpclett.0c02335
Role of Ion-Phospholipid Interactions in Zwitterionic Phospholipid Bilayer Ion Permeation
Deplazes, Evelyne, Tafalla, Beatriu Domingo, Cranfield, Charles G. and Garcia, Alvaro (2020). Role of Ion-Phospholipid Interactions in Zwitterionic Phospholipid Bilayer Ion Permeation. Journal of Physical Chemistry Letters, 11 (15), 6353-6358. doi: 10.1021/acs.jpclett.0c01479
Molecular Dynamics Simulation of Small Molecules Interacting with Biological Membranes
Martinotti, Carlo, Ruiz-Perez, Lanie, Deplazes, Evelyne and Mancera, Ricardo L. (2020). Molecular Dynamics Simulation of Small Molecules Interacting with Biological Membranes. Chemphyschem, 21 (14), 1486-1514. doi: 10.1002/cphc.202000219
The effect of hydronium ions on the structure of phospholipid membranes
Deplazes, Evelyne, Poger, David, Cornell, Bruce and Cranfield, Charles G. (2017). The effect of hydronium ions on the structure of phospholipid membranes. Physical Chemistry Chemical Physics, 20 (1), 357-366. doi: 10.1039/c7cp06776c
Membrane-binding properties of gating modifier and pore-blocking toxins: membrane interaction is not a prerequisite for modification of channel gating
Deplazes, Evelyne, Troeira Henriques, Sonia, Smith, Jennifer J., King, Glenn F., Craik, David J., Mark, Alan E. and Schroeder, Christina I. (2016). Membrane-binding properties of gating modifier and pore-blocking toxins: membrane interaction is not a prerequisite for modification of channel gating. Biochimica et Biophysica Acta - Biomembranes, 1858 (4), 872-882. doi: 10.1016/j.bbamem.2016.02.002
Researcher biography
I was awarded my PhD in Computational Biophysics from the University of Western Australia (2012) for my work on combining molecular modelling and simulation approaches with fluorescence spectroscopy experiments to study mechanosensitive ion channels.
Following this, I carried out Postdoctoral work at the University of Queensland and Curtin University, funded by Early Career Fellowships from the Swiss National Science Foundation and the Australian National Health and Research Council (NHMRC). In 2019, I joined UTS under a UTS Chancellor's Postdoctoral Research Fellowship and started my independent research group. In 2021, I returned to the University of Queensland as a Senior Lecturer.
Apart from my research, I am a passionate advocate for mental health in academia and
supporting PhD students. My teaching and supervision are guided by encouraging students to become 'critical thinkers'. I practice mindful leadership and aim to integrate kindness and gratitude into how I lead my research team.