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Transglycosylation activity of cellobiohydrolase I from Trichoderma longibrachiatum on synthetic and natural
A V Gusakov1, O V Protas, V M Chernoglazov
1Department of Chemistry, M.V. Lomonosov Moscow State University, U.S.S.R.
Abstract:
Using 4-methylumbelliferyl (MUF) beta-D-cellobioside as a substrate, the ability of cellobiohydrolase I from Trichoderma longibrachiatum to catalyze transglycosylation has been demonstrated. At substrate concentrations greater than 2 mM, the formation of MUF-tetrasaccharide was detected using HPLC. In the course of enzymatic reaction, a concentration of the transglycosylation product passed through a maximum, since at later stages of the reaction the product was further hydrolyzed. At MUF-beta-D-cellobioside concentrations of 2-10 mM, the maximum weight content of MUF-tetrasaccharide amounted to 1-4% of the total content of saccharides. In the reaction system, containing 2.5 mM MUF-beta-D-cellobioside and 10 mM MUF-beta-D-glucoside, MUF-trisaccharide was formed as the main transglycosylation product. In hydrolysis of natural substrates (cellulose and cellotriose) in the presence of MUF-beta-D-glucoside a formation of MUF-trisaccharide was also observed.