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Heparin influence on alpha-staphylotoxin formed channel.

O V Krasilnikov1, P G Merzlyak, L N Yuldasheva

  • 1Laboratory of Molecular Physiology, Institute of Physiology and Biophysics, 700095, Tashkent, Uzbekistan. kras@npd.ufpe.br

Biochimica Et Biophysica Acta
|March 17, 1999
PubMed
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Heparin significantly enhances the voltage sensitivity of Staphylococcus aureus alpha-toxin (ST channel) ion channels. This effect, dependent on heparin

Area of Science:

  • Biophysics
  • Molecular Biology
  • Membrane Protein Studies

Background:

  • Staphylococcus aureus alpha-toxin (ST channel) forms pores in lipid bilayers.
  • Understanding ion channel gating mechanisms is crucial for pharmacology and disease research.

Purpose of the Study:

  • To investigate the effects of heparin on the voltage sensitivity of ST channels.
  • To elucidate the molecular interactions governing heparin-ST channel modulation.

Main Methods:

  • Voltage clamp electrophysiology on lipid bilayers reconstituted with ST channels.
  • Dose-response studies with varying heparin concentrations.
  • Investigation of divalent cation effects (Zn2+, Ca2+, Mg2+).

Main Results:

Related Experiment Videos

  • Low heparin concentrations (100 pM) induced a dose-dependent increase in ST channel voltage sensitivity.
  • Heparin's effect was dependent on its addition to the negative-potential side and the presence of divalent cations.
  • Divalent cation efficiency followed the order Zn2+ > Ca2+ > Mg2+.
  • Apparent positive gating charge increased 2-3 fold with heparin or acidification.
  • The cis mouth of the channel showed less sensitivity to heparin than the trans mouth.

Conclusions:

  • Heparin, in conjunction with divalent cations, modulates ST channel gating by interacting with charged residues.
  • Divalent cations act as bridges between heparin's sulfate groups and the protein's carboxyl groups.
  • Charged residues at the cis and trans mouths of the ST channel likely differ in their interaction with heparin.