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Related Experiment Videos

Ca2+ channel selectivity at a single locus for high-affinity Ca2+ interactions

P T Ellinor1, J Yang, W A Sather

  • 1Department of Molecular and Cellular Physiology, Beckman Center, Stanford University Medical Center, California 94305, USA.

Neuron
|November 1, 1995
PubMed
Summary

Calcium (Ca2+) channels use four glutamate residues in their pore-lining segments for high-affinity Ca2+ binding. Mutating these residues reveals their cooperative role in ion interaction and selectivity.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Ion Channel Physiology

Background:

  • Calcium (Ca2+) channels are crucial for cellular signaling and function.
  • Their selectivity and permeability are traditionally linked to discrete Ca2+ binding sites.
  • The pore-lining segments of Ca2+ channel alpha 1 subunits contain glutamate residues implicated in Ca2+ binding.

Purpose of the Study:

  • To investigate the role of pore-region glutamate residues in Ca2+ channel function.
  • To determine the contribution of these glutamates to Ca2+ binding affinity and selectivity.
  • To elucidate the interaction of multiple divalent cations within the Ca2+ channel pore.

Main Methods:

  • Site-directed mutagenesis of pore-region glutamate residues in Ca2+ channels.

Related Experiment Videos

  • Electrophysiological recordings to assess Ca2+ channel current and block.
  • Systematic replacement of glutamate with amino acids of varying side-chain properties (e.g., glutamine, alanine, aspartate).

    • Main Results:

    • Replacing all four P-region glutamates abolished high-affinity Ca2+ block of monovalent currents.
    • No additional independent high-affinity Ca2+ binding sites were revealed upon mutation.
    • Pairwise and systematic single-residue mutations demonstrated cooperative interactions among the four glutamates.
    • Asymmetric effects of mutations indicated distinct roles for glutamates in different repeats, particularly repeat I.

    Conclusions:

    • The four pore-region glutamate residues cooperate to support high-affinity interactions with single Ca2+ ions.
    • These glutamates collectively regulate Ca2+ channel selectivity and permeability.
    • The findings challenge simple models of discrete binding sites and highlight the complex interplay of multiple residues in ion permeation.