Effect of salts on the interaction of oxidized glutathione with dibasic amino acids

摘要

The interaction of oxidized glutathione (GSSG) with dibasic amino acids was studied with charge-transfer chromatography carried out on unimpregnated cellulose layers in the absence and presence of LiCl, NaCl, KCl, MgCl_2 and CaCl_2. GSSG decreased in each case the apparent lipophilicity of dibasic amino acids, indicating some type of interaction. Calculations proved that the strength of GSSG - dibasic amino acid interaction decreases with increasing concentration of salts suggesting a hydrophilic character of interaction. It can be assumed that electrostatic forces between the carboxyl group of GSSG and the amino groups of amino acids are involved in the interaction. GSSG binds stronger to arginine than to lysine and ornithine suggesting that arginine is probably the primary binding site in proteins for GSSG.