Cell and Tissue Biology

, 3:470 | Cite as

Conductance of phytotoxin channels in the presence of large organic ions

  • O. S. Ostroumova
  • S. S. Efimova
  • L. V. Schagina


In this study we evaluated the effect of the size of penetrating anions on properties of the channels formed by cyclic lipodepsipeptide syringomycin E (SRE) in bilayer lipid membranes. Conductance and the mean lifetime of SRE channels were measured in 0.4 M solutions of sodium chloride, aspartate, and gluconate. A comparison of results of conductometric and electrophysiological measurements has shown the following: (1) the ratio of mobilities of aspartate anions in the channel and in the aqueous solution is five times lower than that of chlorine anions and (2) the conductance of channels in the presence of sodium gluconate is due mainly to cations. The obtained results indicate the binding of penetrating anions to the selective filter of the SRE pore. The radius of the SRE channel selective filter has been established (r ∼ 0.3 nm) and its localization in the cis-mouth of the pore has been found.

Key words

bilayer lipid membranes channel-forming toxins single ion channels selective filter of the pore 


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Copyright information

© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  • O. S. Ostroumova
    • 1
  • S. S. Efimova
    • 1
  • L. V. Schagina
    • 1
  1. 1.Institute of CytologyRussian Academy of SciencesSt. PetersburgRussia

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