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Functional Reconstitution and Channel Activity Measurements of Purified Wildtype and Mutant CFTR Protein
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Conformational changes opening and closing the CFTR chloride channel: insights from cysteine scanning mutagenesis

Yassine El Hiani1, Paul Linsdell

  • 1Department of Physiology & Biophysics, Dalhousie University, Halifax, NS B3H 4R2, Canada.

Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire
|November 5, 2014
PubMed

Insights

Cystic fibrosis transmembrane conductance regulator (CFTR) channel gating mechanisms remain elusive. This study reviews CFTR architecture in open and closed states, revealing how its structure changes to control chloride ion flow, crucial for treating cystic fibrosis.

Area of Science:

  • Biophysics
  • Molecular Biology
  • Genetics

Background:

  • Cystic fibrosis (CF) is a lethal genetic disease caused by defective cystic fibrosis transmembrane conductance regulator (CFTR) chloride channels.
  • CFTR is an ATP-binding cassette (ABC) transporter, and its function relies on ATP-driven conformational changes.
  • The precise structural changes governing CFTR channel gating (opening and closing) are not fully understood.

Purpose of the Study:

  • To elucidate the structural dynamics of the CFTR channel during its gating cycle.
  • To understand how conformational changes in nucleotide-binding domains (NBDs) regulate chloride permeation.
  • To provide insights into CFTR defects and potential therapeutic strategies.

Main Methods:

  • Review of diverse biophysical techniques, including substituted cysteine accessibility.
  • Analysis of disulfide cross-linking data.
  • Integration of patch-clamp recording data.

Main Results:

  • Characterization of the CFTR channel architecture in both open and closed conformations.
  • Detailed examination of structural transitions between closed and open states.
  • Functional portrayal of cytoplasmic and vestigial gates during the gating cycle.

Conclusions:

  • Understanding CFTR gating mechanics is fundamental to comprehending CF pathophysiology.
  • Knowledge of CFTR structural dynamics can inform novel therapeutic approaches to enhance channel activity in CF patients.
Keywords:
CFTRFKchloride channelcystic fibrosisgateporte cytoplasmiqueporte vestigialstructure fonctionnelle

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