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Related Experiment Videos

Voltage gating and anions, especially phosphate: a model system.

Padmanava Pradhan1, Ranajeet Ghose, Michael E Green

  • 1Department of Chemistry, City College of the City University of New York, New York, NY 10031, USA.

Biochimica Et Biophysica Acta
|November 18, 2005
PubMed
Summary

Phosphate anions form complexes with arginines in voltage-gated ion channel S4 segments. This interaction, confirmed by NMR, suggests a role for anions in regulating channel function and S4 voltage sensor movement.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Neuroscience

Background:

  • Voltage-gated ion channels, crucial for electrical signaling, possess a voltage sensor domain (S4 segment) with positively charged arginines.
  • The outward movement of the S4 segment is proposed to gate channel opening, but direct evidence for large-scale motion is debated.
  • Anions like phosphate are present intracellularly and extracellularly, with potential to interact with charged residues.

Purpose of the Study:

  • To investigate the interaction between phosphate anions and arginine residues within a model peptide mimicking the S4 segment of voltage-gated channels.
  • To provide experimental evidence for the formation of phosphate-arginine complexes and their biological relevance.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy was employed to study a model peptide containing two arginines spaced by hydrophobic residues.

Related Experiment Videos

  • NMR chemical shifts were analyzed as a function of varying phosphate concentration and pH to characterize complex formation and titration.
  • Previous computational modeling of arginine-phosphate complexes was considered.

    • Main Results:

    • NMR evidence confirmed the formation of phosphate complexes with the model arginine-containing peptide at biologically relevant concentrations (hundreds of micromolar).
    • Distinct complexes were observed for different phosphate species (HPO(4)(2-) and H(2)PO(4)(-)), with titration curves revealing phosphate's standard pK.
    • The findings support the hypothesis of strong phosphate-arginine interactions within the S4 segment.

    Conclusions:

    • Phosphate anions can form significant complexes with arginine residues in a context mimicking the S4 segment of voltage-gated ion channels.
    • These interactions may influence the conformation and movement of the S4 voltage sensor, potentially modulating channel gating.
    • The study suggests that anion interactions, including ion pairing with other anions like chloride, could play a role in voltage sensor function.