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Related Experiment Videos

Structural insight into Ca2+ specificity in tetrameric cation channels.

Amer Alam1, Ning Shi, Youxing Jiang

  • 1Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9040, USA.

Proceedings of the National Academy of Sciences of the United States of America
|September 20, 2007
PubMed
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Calcium (Ca2+) ions block and permeate monovalent cation channels like cyclic nucleotide-gated (CNG) channels. Structural analysis of the NaK channel reveals novel Ca2+ binding sites, explaining its dual role.

Area of Science:

  • Structural Biology
  • Ion Channel Physiology
  • Biochemistry

Background:

  • Calcium (Ca2+) ions are crucial for regulating monovalent cation currents in channels like cyclic nucleotide-gated (CNG) channels.
  • The NaK channel, a bacterial homolog of CNG channels, provides a structural model for understanding Ca2+ interactions.

Purpose of the Study:

  • To perform a detailed structural analysis of the NaK channel focusing on Ca2+ permeability and blockage.
  • To elucidate the structural basis for Ca2+ binding and its role in ion channel function.

Main Methods:

  • X-ray crystallography
  • Structural analysis
  • Biophysical characterization (implied)

Main Results:

Related Experiment Videos

  • Identified a Ca2+ binding site at the extracellular entrance of the NaK channel selectivity filter, involving backbone carbonyls of Gly-67, not Asp-66 directly.
  • Confirmed Asp-66's indirect role in Ca2+ specificity.
  • Discovered a second Ca2+ binding site within the selectivity filter, explaining Ca2+ permeation.
  • Demonstrated a novel Ca2+ chelation mechanism using only backbone carbonyl oxygens.

    • Conclusions:

    • The NaK channel exhibits a unique Ca2+ binding and permeation mechanism.
    • These findings offer insights into how Ca2+ functions as both a permeant ion and blocker in CNG channels.
    • Suggests a potential shared mechanism for Ca2+ chelation in various Ca2+ channels.