Cftr Purification
Cftr Purification - Related Videos
10:05
In Vitro Analysis of PDZ-dependent CFTR Macromolecular Signaling Complexes
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Cited by 7 •
2012
Cystic fibrosis transmembrane conductance regulator (CFTR), an epithelial chloride channel, has been reported to interact with various proteins and regulate important cellular processes; among them the CFTR PDZ motif-mediated interactions have been well documented. This protocol describes methods we developed to assemble a PDZ-dependent CFTR macromolecular signaling complex in vitro.
09:59
Functional Reconstitution and Channel Activity Measurements of Purified Wildtype and Mutant CFTR Protein
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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.
15:12
Purification of the Cystic Fibrosis Transmembrane Conductance Regulator Protein Expressed in Saccharomyces cerevisiae
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Cited by 21 •
2014
Heterologous expression and purification of the cystic fibrosis transmembrane conductance regulator (CFTR) are significant challenges and limiting factors in the development of drug therapies for cystic fibrosis. This protocol describes two methods for the isolation of milligram quantities of CFTR suitable for functional and structural...
14:56
Expression and Purification of the Cystic Fibrosis Transmembrane Conductance Regulator Protein in Saccharomyces cerevisiae
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Cited by 19 •
2012
Attempts to express the cystic fibrosis transmembrane conductance regulator (CFTR) in Saccharomyces cerevisiae have, until now, yielded relatively low amounts of protein. This protocol and the associated reagents distributed via the Cystic Fibrosis Foundation should allow the preparation of milligram amounts of this 'difficult' eukaryotic membrane protein.
08:16
Plasmid Purification
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2023
Plasmid purification is a technique used to isolate and purify plasmid DNA from genomic DNA, proteins, ribosomes, and the bacterial cell wall. A plasmid is a small, circular, double-stranded DNA that is used as a carrier of specific DNA molecules. When introduced into a host organism via transformation, a plasmid will be replicated, creating numerous copies of the DNA fragment under study. In this video, a step-by-step generalized procedure is described for how to perform plasmid purification.
FAQs
Detergent choice strongly influences whether CFTR remains structurally intact after removal from lipid bilayers. The detergent must disrupt the surrounding membrane sufficiently to release the protein, yet maintain a compatible environment for its folded state. This balance matters because poorly preserved preparations may not support meaningful studies of ATP-dependent gating, channel activity, or interactions with regulatory molecules.
Keeping CFTR in detergent provides a prepared form for biochemical or structural analysis, while reconstitution places the channel in a defined membrane environment. The two formats address different experimental needs: detergent preparations emphasize protein handling and molecular interactions, whereas artificial membranes more closely represent the lipid setting relevant to channel behavior.
Purification allows variants to be examined as isolated proteins rather than only through their effects in intact cells. Researchers can compare folding, ATP-dependent gating, channel activity, and interactions with regulatory molecules under controlled preparation conditions. This helps connect a variant with a molecular defect and supports evaluation of compounds intended to correct defective processing or function.
The workflow begins with detergent-mediated solubilization to extract CFTR from lipid bilayers. Chromatographic separation then helps isolate the target protein from other components, and buffer exchange places the preparation in conditions suited to its next use. The final material can remain detergent-stabilized or be reconstituted into artificial membranes, depending on the planned experiment.
Buffer exchange adapts the purified protein to conditions required for stability or downstream analysis after separation. It can prepare CFTR for continued storage in detergent or for transfer into a reconstitution scheme with artificial membranes. This step therefore links purification to experimental function, helping preserve a preparation suitable for structural, biochemical, or channel-activity studies.
Purified CFTR supports structural and biochemical investigations of channel activity, ATP-dependent gating, folding, and interactions with regulatory molecules. It also provides a controlled system for studying disease-associated variants and testing compounds that target defective processing or function. These applications connect protein-level observations with broader questions about epithelial fluid-balance biology and cystic fibrosis mechanisms.