Cftr Protein Purification
Cftr Protein Purification - Related Videos
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.
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.
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.
07:17
Purification of Hsp104, a Protein Disaggregase
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Cited by 24 •
2011
Here, we describe a protocol for the purification of highly active Hsp104, a hexameric AAA+ protein from yeast, which couples ATP hydrolysis to protein disaggregation. This scheme exploits a His6-tagged construct for affinity purification from E. coli followed by anion-exchange chromatography, His6-tag removal with TEV protease, and size-exclusion chromatography.
FAQs
Detergents must extract CFTR from lipid membranes without destroying the protein’s native structure or channel activity. This balance is essential because membrane removal can alter the environment required for proper folding and function. A suitable membrane-mimetic condition therefore determines whether the purified preparation remains useful for studying gating, regulation, and disease-associated changes.
CFTR activity depends on ATP-related regulation of its chloride and bicarbonate channel function. Purified preparations allow researchers to examine how ATP-dependent control relates to channel gating rather than observing only the behavior of intact cells. This makes the protein suitable for focused biochemical and biophysical analysis of regulatory mechanisms.
Affinity methods help selectively capture CFTR, whereas chromatography-based separation helps distinguish it from other proteins present after membrane extraction. Using these approaches together supports enrichment while researchers monitor whether the protein remains structurally intact and active. The resulting preparation is more appropriate for controlled studies than an unseparated membrane extract.
A typical workflow begins by expressing CFTR in a host system, followed by extracting the membrane-associated protein with selected detergents or other membrane-mimetic materials. Affinity capture and chromatography then separate CFTR from accompanying proteins. Throughout the sequence, conditions must support both recovery and preservation of the protein’s structure and activity.
Purified CFTR enables direct investigation of channel gating, ATP-dependent regulation, folding, and the effects of disease-associated variants. Studying these properties in an isolated preparation helps connect changes in the protein itself with mechanisms relevant to cystic fibrosis. The approach therefore complements broader biological studies by focusing on CFTR’s molecular behavior.
A purified preparation provides a defined protein system for examining how CFTR-modulating drugs affect the channel’s properties. Researchers can assess drug-related changes alongside gating and ATP-dependent regulation, while reducing the complexity introduced by other cellular components. These experiments contribute to understanding drug action and to investigating cystic fibrosis mechanisms at the protein level.