Kv Channel Reconstitution
Kv Channel Reconstitution - Related Videos
10:22
Reconstitution of a Kv Channel into Lipid Membranes for Structural and Functional Studies
0 Views •
Cited by 11 •
2013
Procedures for complete reconstitution of a prototype voltage-gated potassium channel into lipid membranes are described. The reconstituted channels are suitable for biochemical assays, electrical recordings, ligand screening and electron crystallographic studies. These methods may have general applications to the structural and functional studies of other membrane proteins.
11:33
Isolation and Kv Channel Recordings in Murine Atrial and Ventricular Cardiomyocytes
0 Views •
Cited by 15 •
2013
Kv channel dysfunction is associated with cardiac arrhythmias. In order to study the molecular mechanisms that lead to such arrhythmias we utilize a systematic protocol for isolation of atrial and ventricular cardiomyocytes from Kv channel ancillary subunit knockout mice. Isolated cardiomyocytes can then immediately be used for cellular electrophysiological studies, biochemical or immunofluorescence (IF) assays.
09:59
Functional Reconstitution and Channel Activity Measurements of Purified Wildtype and Mutant CFTR Protein
0 Views •
Cited by 7 •
2015
Described here is a rapid and effective procedure for functional reconstitution of purified wild-type and mutant CFTR protein that preserves activity for this chloride channel, which is defective in Cystic Fibrosis. Iodide efflux from reconstituted proteoliposomes mediated by CFTR allows studies of channel activity and the effects of small molecules.
07:05
Reconstitution of Membrane Proteins
0 Views •
2023
Reconstitution is the process of returning an isolated biomolecule to its original form or function. This is particularly useful for studying membrane proteins, which enable important cellular functions and affect the behavior of nearby lipids. To study the function of purified membrane proteins in situ, they must be reconstituted by integrating them into an artificial lipid membrane. This video introduces membrane protein reconstitution concepts and related procedures, such as protein...
07:14
Reconstitution of the Bacterial Glutamate Receptor Channel by Encapsulation of a Cell-Free Expression System
0 Views •
Cited by 1 •
2024
This protocol describes the inverted emulsion method used to encapsulate a cell-free expression (CFE) system within a giant unilamellar vesicle (GUV) for the investigation of the synthesis and incorporation of a model membrane protein into the lipid bilayer.
FAQs
Voltage-sensor movement links changes in membrane voltage to structural changes in the channel protein. Those changes regulate access to the pore, determining whether potassium can cross the bilayer. Recording activity while voltage is varied allows researchers to examine this coupling directly, rather than inferring it from the combined behavior of many proteins and cellular processes.
The surrounding lipid bilayer can influence how the channel operates, making membrane composition an experimental variable rather than merely a passive support. Kv channel reconstitution places the protein in a defined membrane environment, allowing investigators to compare channel behavior under controlled lipid conditions and identify effects that may be obscured by the complex membranes of living cells.
Changing ionic conditions helps separate two channel properties that are often measured together: voltage-dependent gating and ion selectivity. Voltage variation probes opening and closing, whereas controlled ionic compositions reveal how selectively the pore permits potassium flux. Electrophysiological recordings under these conditions provide a way to relate pore behavior to the channel’s molecular function.
A typical workflow begins with purified voltage-gated potassium channel protein and a defined artificial lipid bilayer. The reconstituted system is then exposed to selected membrane voltages and ionic conditions while electrical activity is recorded. Researchers compare the resulting signals across conditions to evaluate gating, potassium movement, lipid effects, or responses to pharmacological modulation.
Electrophysiological recordings can reveal how channel activity changes as membrane voltage, ionic conditions, membrane lipids, or pharmacological agents are varied. These measurements help connect experimental conditions with pore opening, closing, and potassium flux. Because the membrane environment is defined, observed changes can be interpreted with fewer contributions from unrelated cellular components.
This approach provides a controlled bridge between molecular channel properties and biological questions in membrane biophysics, neurobiology, and cardiac physiology. It also supports investigation of compounds that modify ion-channel function. By isolating channel behavior from the broader cellular environment, researchers can study mechanisms relevant to electrical signaling and evaluate pharmacological modulation more directly.