1Institut Curie, Centre de Recherche, CNRS, UMR 168, PhysicoChimie Curie, Université Pierre et Marie Curie, 2Kavli Institute for Brain and Mind, University of California, San Diego, 3Molecular Physiology and Biophysics Section, National Institute for Neurological Disorders and Stroke, National Institute of Health
The reconstitution of the transmembrane protein, KvAP, into giant unilamellar vesicles (GUVs) is demonstrated for two dehydration-rehydration methods — electroformation, and gel-assisted swelling. In both methods, small unilamellar vesicles containing the protein are fused together to form GUVs that can then be studied by fluorescence microscopy and patch-clamp electrophysiology.
Published January 22, 2015. Keywords: Biochemistry, Biomimetic model system, Giant Unilamellar Vesicle, reconstitution, ion channel, transmembrane protein, KvAP, electroformation, gel assisted swelling, agarose, inside-out patch clamp, electrophysiology, fluorescence microscopy
1Department of Neuroscience, Uppsala University, Sweden
We use the patch-clamp technique to measure GABA-activated single-channel currents (GABAA channels, GABAA receptors) and the synaptic and tonic currents they generate in neurons. Activation of the channels decreases neuronal excitability in health and disease 1,2,3,4.
Published July 17, 2011. Keywords: Neuroscience, brain, patch-clamp, ion channels, tonic current, slices, whole-cell current, single-channel current, GABAA, GABA
1Department of Physics, Syracuse University
A method of using solid-state nanopores to monitor the non-specific adsorption of proteins onto an inorganic surface is described. The method employs the resistive-pulse principle, allowing for the adsorption to be probed in real-time and at the single-molecule level. Because the process of single protein adsorption is far from equilibrium, we propose the employment of parallel arrays of synthetic nanopores, enabling for the quantitative determination of the apparent first-order reaction rate constant of protein adsorption as well as and the Langmuir adsorption constant.
Published December 2, 2011. Keywords: Bioengineering, Solid-state nanopore, S/TEM, single-molecule biophysics, protein adsorption, resistive-pulse technique, nanopore spectroscopy