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Structural identification of a selectivity filter in CFTR.

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Researchers identified a chloride-binding site in the cystic fibrosis transmembrane conductance regulator (CFTR) protein. This crucial selectivity filter explains how CFTR controls chloride ion flow, offering insights into cystic fibrosis.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Structural Biology

Background:

  • The cystic fibrosis transmembrane conductance regulator (CFTR) is a vital chloride channel protein.
  • CFTR dysfunction causes cystic fibrosis by impairing epithelial salt and fluid homeostasis.
  • Previous CFTR structures left the ion-conduction pathway and selectivity filter poorly defined.

Purpose of the Study:

  • To elucidate the complete ion-conduction pathway of the CFTR protein.
  • To determine the structure and function of the CFTR selectivity filter.
  • To identify the precise mechanism of chloride ion permeation through CFTR.

Main Methods:

  • Structural analysis of the CFTR protein.
  • Identification of key residues involved in chloride binding and ion permeation.
  • Functional assays to assess the impact of mutations on ion selectivity and conductance.

Main Results:

  • A chloride-binding site was identified at the extracellular ends of transmembrane helices 1, 6, and 8.
  • This site, coordinated by specific residues (G103, R334, F337, T338, Y914), functions as the selectivity filter.
  • Alterations to this site significantly impact CFTR's ion selectivity, conductance, and open channel block.

Conclusions:

  • The identified selectivity filter governs chloride ion passage through CFTR.
  • A complete conductance pathway, from cytosol to extracellular space, has been proposed.
  • This finding provides a structural basis for understanding CFTR function and dysfunction in cystic fibrosis.