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Purification and properties of an endoglucanase of Aspergillus terreus DSM 826
Author(s) -
Elshafei Ali M.,
Hassan Mohamed M.,
Haroun Bakry M.,
AbdelFatah Osama M.,
Atta Housam M.,
Othman Abdelmageed M.
Publication year - 2009
Publication title -
journal of basic microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.58
H-Index - 54
eISSN - 1521-4028
pISSN - 0233-111X
DOI - 10.1002/jobm.200800227
Subject(s) - aspergillus terreus , chromatography , fractionation , cellulase , chemistry , bagasse , acetone , substrate (aquarium) , cellulose , specific activity , enzyme , enzyme assay , biochemistry , biology , ecology
Endoglucanase (EG) from A. terreus DSM 826 grown on sugar cane bagasse as a carbon source was purified using acetone fractionation, then a Sepharose‐4B chromatographic column, with purification of about 27‐fold and 10.5% recovery. The optimum temperature and pH for activity of the purified EG were found to be 50 °C and pH 4.8, respectively. The purified enzyme can stand heating up to 50 °C for 1 h without apparent loss of activity. However, the enzyme, incubated at 80 °C for 5 min, showed about 56% loss of activity. Optimum EG activity was recorded with a citrate buffer system (pH 4.8; 0.05 M). Co 2+ (2.5 × 10 –2 M) and Zn 2+ (5 × 10 –2 M) were found to activate the purified EG of A. terreus DSM 826 by about 83 and 25%, respectively. On the other hand, Hg 2+ inhibited the activity of the purified EG by about 50 and 71% at a concentration of 2.5 × 10 –2 and 5 × 10 –2 M, respectively. Carboxymethyl cellulose was found to be the best substrate for the purified EG, with V max values of 4.35 μmol min –1 mg –1 protein. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)