Model Membrane Structure, Molecular Order, Fluctuations and Dynamics

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The overall aim of this research program is to improve our understanding of how the physical properties of membranes affect their biological function. A more immediate goal is to understand how these physical properties affect and determine the approaches which can be used to study membranes. Our ability to perform accurate experimental measurements depends on the physical properties of the membrane. For example, in fluorescence microscopy or in nuclear magnetic resonance (NMR) spectroscopy the rates of molecular motion determine whether or not we can actually observe anything at all. Cholesterol has long been known to thicken the membrane bilayer and to make it somewhat more resilient. More recently it has been found that the high cholesterol content of plasma membranes places them close to a critical point such that the local membrane composition fluctuates. This may turn out to have a significant impact on membrane function. We are also studying how the inclusion of peptides, as model proteins, affect this behaviour in model membranes and how the peptides themselves are affected by the critical behaviour. Furthermore, we want to learn more about the interaction between small membrane active peptides and the membrane.