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Cryo-EM Visualization of an Active High Open Probability CFTR Anion Channel.

Jonathan F Fay1, Luba A Aleksandrov1, Timothy J Jensen1

  • 1University of North Carolina , Chapel Hill , North Carolina 27515 , United States.

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Structural insights into the cystic fibrosis transmembrane conductance regulator (CFTR) anion channel reveal key movements in active and inactive states. This research clarifies how CFTR functions, offering new understanding for cystic fibrosis.

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Area of Science:

  • Structural Biology
  • Biochemistry
  • Ion Channel Physiology

Background:

  • The cystic fibrosis transmembrane conductance regulator (CFTR) is an anion channel vital for epithelial homeostasis.
  • CFTR dysfunction due to gene mutations causes cystic fibrosis.
  • CFTR activity is regulated by phosphorylation and nucleotide binding, but its structural transitions remain unclear.

Purpose of the Study:

  • To determine the 3D structures of inactive and active states of a thermally stabilized CFTR.
  • To elucidate the structural changes underlying CFTR's active and inactive functional states.
  • To gain insights into the mechanism of anion permeation through the CFTR channel.

Main Methods:

  • Determined cryo-EM structures of inactive and active CFTR states at 4.3 and 6.6 Å resolution.
  • Utilized a thermally stabilized CFTR construct.
  • Confirmed channel activity after reconstitution into proteoliposomes.

Main Results:

  • Revealed unique repositioning of transmembrane helices and regulatory domain density between active and inactive states.
  • Observed an extracellular vestibule formed by transmembrane helices 7 and 8, potentially facilitating anion access.
  • Provided high-resolution structural data for an active, open state of the CFTR channel.

Conclusions:

  • The study provides unprecedented structural detail of CFTR in both inactive and active conformations.
  • The findings offer critical insights into the gating mechanism and structural transitions of the CFTR anion channel.
  • This structural information advances our understanding of CFTR function and potential therapeutic strategies for cystic fibrosis.