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Backbone amides are determinants of Cl− selectivity in CLC ion channels

Author

Listed:
  • Lilia Leisle

    (Weill Cornell Medical College)

  • Kin Lam

    (University of Illinois at Urbana-Champaign
    University of Illinois at Urbana-Champaign
    University of Illinois at Urbana-Champaign
    University of Illinois at Urbana-Champaign)

  • Sepehr Dehghani-Ghahnaviyeh

    (University of Illinois at Urbana-Champaign
    University of Illinois at Urbana-Champaign
    University of Illinois at Urbana-Champaign
    University of Illinois at Urbana-Champaign)

  • Eva Fortea

    (Weill Cornell Medical College
    Weill Cornell Medical College)

  • Jason D. Galpin

    (University of Iowa)

  • Christopher A. Ahern

    (University of Iowa)

  • Emad Tajkhorshid

    (University of Illinois at Urbana-Champaign
    University of Illinois at Urbana-Champaign
    University of Illinois at Urbana-Champaign
    University of Illinois at Urbana-Champaign)

  • Alessio Accardi

    (Weill Cornell Medical College
    Weill Cornell Medical College
    Weill Cornell Medical College)

Abstract

Chloride homeostasis is regulated in all cellular compartments. CLC-type channels selectively transport Cl− across biological membranes. It is proposed that side-chains of pore-lining residues determine Cl− selectivity in CLC-type channels, but their spatial orientation and contributions to selectivity are not conserved. This suggests a possible role for mainchain amides in selectivity. We use nonsense suppression to insert α-hydroxy acids at pore-lining positions in two CLC-type channels, CLC-0 and bCLC-k, thus exchanging peptide-bond amides with ester-bond oxygens which are incapable of hydrogen-bonding. Backbone substitutions functionally degrade inter-anion discrimination in a site-specific manner. The presence of a pore-occupying glutamate side chain modulates these effects. Molecular dynamics simulations show backbone amides determine ion energetics within the bCLC-k pore and how insertion of an α-hydroxy acid alters selectivity. We propose that backbone-ion interactions are determinants of Cl− specificity in CLC channels in a mechanism reminiscent of that described for K+ channels.

Suggested Citation

  • Lilia Leisle & Kin Lam & Sepehr Dehghani-Ghahnaviyeh & Eva Fortea & Jason D. Galpin & Christopher A. Ahern & Emad Tajkhorshid & Alessio Accardi, 2022. "Backbone amides are determinants of Cl− selectivity in CLC ion channels," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-35279-1
    DOI: 10.1038/s41467-022-35279-1
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    References listed on IDEAS

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