[Size of the "distortion" area of the membrane close to the ion channel formed by gramicidin A].

Young's modolus of the bilayer membrane (BLM) in the direction normal to membrane plane approximately E perpendicular changes if gramicidin A molecules are incorporated into BLM. The plot of approximately E perpendicular on membrane conductivity is a monotonic curve with saturation at BLM conductivity corresponding distances between gramicidin A dimers about 1000 angstrom. The conclusion is made that dimer formation generates drastic reorganization of BLM structure, the size of distortion zone of the membrane near the ionic channel is of the same value.