Thermostable glucose-tolerant glucoamylase produced by the thermophilic fungus Scytalidium thermophilum

Glucoamylase produced by Scytalidium thermophilum was purified 80-fold by DEAE-cellulose, ultrafiltration and CM-cellulose chromatography. The enzyme is a glycoprotein containing 9.8 % saccharide, pI of 8.3 and molar mass of 75 kDa (SDS-PAGE) or 60 kDa (Sepharose 6B). Optima of pH and temperature with starch or maltose as substrates were 55/70 degreesC and 55/65 degreesC, respectively. The enzyme was stable for 1 h at 55 degreesC and for about 8 d at 4 degreesC, either at pH 7.0 or pH 5,5. Starch, amylopectin, glycogen, amylose and maltose were the substrates preferentially hydrolyzed. The activity was activated by 1 mmol/L Mg2+ (27 %), Zn2+ (21 %), Ba2+ (8 %) and Mn2+ (5 %). K-m and v(lim) values for starch and maltose were 0.21 g/L, 62 U/mg protein and 3.9 g/L, 9.0 U/mg protein, respectively. Glucoamylase activity was only slightly inhibited by glucose up to a 1 mol/L concentration.