Purification and Properties of Endocllulase from Thermoascus aurantiacus var.levisporus

WANGDong-Mei;MENGJun;LIDuo-Chuan

Chinese Journal of Biochemistry and Molecular Biology ›› 2009, Vol. 25 ›› Issue (10) : 926-931.

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PDF(416 KB)
Chinese Journal of Biochemistry and Molecular Biology ›› 2009, Vol. 25 ›› Issue (10) : 926-931.
Research Papers

Purification and Properties of Endocllulase from Thermoascus aurantiacus var.levisporus

  • WANG Dong-Mei1)*, MENG Jun2), LI Duo-Chuan3)

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Abstract

Endoglucanase was purified from culture supernatant of Thermoascus aurantiacus var.levisporus to homogeneity, using ammonium sulfate fractionation, DEAE-Sepharose, Pheny1-Sepharos, and Sephacry1 S-100 fast-flow chromatography. The obtained endoglucanase ia a single subunit molecule about 31.5 kD or 34.5 kD as determined by 12% SDS-PAGE and gel filtration, respectively. The maximum endoglucanase activity was observed at pH 2.5~3.0 and 55 ℃. The endoglucanase appeared to be thermostable at 60 ℃, and exposure in 80 ℃ for 30 min resulted in 80% of activity loss. Metal ions like K+, Ca2+ and Mn2+ enhanced the endoglucanase activity, whereas Ag+,Cu2+ and Al3+ inhibited the activity significantly. The endoglucanase possessed a strong specificity to carboxymethyl cellulose.

Key words

thermophilic fungi / Thermoascus aurantiacus var. levisporus / endoglucanase / purification / characterization

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WANGDong-Mei;MENGJun;LIDuo-Chuan. Purification and Properties of Endocllulase from Thermoascus aurantiacus var.levisporus[J]. Chinese Journal of Biochemistry and Molecular Biology, 2009, 25(10): 926-931

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