Purification and characterization of thermostable amylase from a strain of thermoactinomyces thalpophilus KSV 17

This research reported the Purifi cation and Characterization of Thermostable Amylase from a strain of T. Thalpophilus KSV 17. The result showed that the purifi ed enzyme specifi c activity of 145.80 U mg–1, this was an increase of 21 fold than the crude enzyme extract. The analysis of SDS- polyacrylamide gel electrophoresis showed that the molecular weight of the enzyme was 52 kDa. The Optimum pH of the purifi ed enzyme showed maximum activity at pH 7.0, but the enzyme was stable in the pH range of 5.5–7.0. The optimum temperature of the purifi ed enzyme was 85°C in absence of 10 mM CaCl2 while 90°C in presence of 10 mM CaCl2., Km and Vmax values for the purifi ed enzyme were calculated as 5.2 mg ml–1, 0.45 mg ml–1 /minute respectively. The thermal stability of the purifi ed enzyme at 80°C in absence of CaCl2. and 85°C in presence of CaCl2. The purifi ed enzyme mostly inhibited by diethyl pyrocarbonate and N-bromosuccinimide and at 5 mM conc. Ca2+, Na+ and Mg2+ showed stimulatory effect while Cu2+, Zn2+, Hg2+ and Mn2+ shown inhibitory effect. The purifi ed enzyme showed good stability and compatibility on commercial detergents and on being stored for 60 minutes at 85°C.