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Area of Science:

  • Molecular Biology
  • Biophysics
  • Pharmacology

Background:

  • Cystic fibrosis (CF) is a channelopathy caused by mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene.
  • CFTR is an ATP-gated chloride channel; its dysfunction leads to CF.
  • Ivacaftor (VX-770) is an FDA-approved CFTR potentiator, but newer agents like GLPG1837 show higher efficacy for certain mutations.

Purpose of the Study:

  • To elucidate the mechanism of action of the CFTR potentiator GLPG1837.
  • To compare the potentiation mechanisms of GLPG1837 and ivacaftor (VX-770).
  • To investigate the binding interactions of GLPG1837 with CFTR.

Main Methods:

  • Single-channel kinetic analysis of wild-type CFTR.
  • Assessment of drug interactions using combination application of GLPG1837, VX-770, and an ATP analogue (dPATP).
  • Kinetic modeling to describe CFTR gating and potentiator binding.

Main Results:

  • GLPG1837 and VX-770 exhibit similar effects on CFTR single-channel kinetics, independent of NBD dimerization and ATP hydrolysis.
  • GLPG1837 and VX-770 appear to compete for the same binding site on CFTR.
  • GLPG1837 and dPATP act synergistically, suggesting distinct binding sites.
  • GLPG1837 binding affinity is dependent on CFTR open probability, indicating state-dependent allosteric modulation.

Conclusions:

  • GLPG1837 and VX-770 potentiate CFTR gating through a similar allosteric mechanism.
  • GLPG1837 binds to CFTR in a state-dependent manner, favoring the open channel state.
  • A four-state kinetic model explains the interplay between CFTR gating and potentiator binding.