Preparation and Properties of New Biocatalysts for Destruction of Plant non-Starch Polysaccharides

Abstract

Recombinant strains Penicillium verruculosum were created which produce homologous endoglucanase 2 (Er2) and heterologous xylanase E (XylE) P. canescens. The recombinant strains were used for preparing new biocatalysts which are enzyme preparations (EP) enriched considerably with Er2 and XylE; the biocatalysts are highly active to plant non-starch polysaccharides (NPS) such as cellulose, β-glucan, xylan. Proteic chromatography was used for determining the qualitative and quantitative composition of the new EP to show that they contain (expressed as proportions of the total protein content) ca. 16–17 % Er2, 48–63 % XylE, 17–30 % cellobiohydrolase, while EP prepared with the recipient strain contained 1.4 % Er2, ca. 60 % cellobiohydrolase and no XylE. pH equal to 4.0 and 5.5 were optimal for the activity to cellulose (with respect to carboxymethylcellulose, CMC) and to xylanase, respectively, EP being active over a wide range of pH from 3 to 7. EP were active to CMC and xylanase at the temperature range from 20 to 80 °C with maxima at 60 and 70 °C. The activity of new EP to xylanase was practically not inhibited by protein inhibitors of rye.