The Journal of Microbiology

, Volume 48, Issue 1, pp 53–62 | Cite as

Purification and biochemical properties of a glucose-stimulated β-D-glucosidase produced by Humicola grisea var. thermoidea grown on sugarcane bagasse

  • Cesar Vanderlei Nascimento
  • Flávio Henrique Moreira Souza
  • Douglas Chodi Masui
  • Francisco Assis Leone
  • Rosane Marina Peralta
  • João Atílio Jorge
  • Rosa Prazeres Melo Furriel


The effect of several carbon sources on the production of mycelial-bound β-glucosidase by Humicola grisea var. thermoidea in submerged fermentation was investigated. Maximum production occurred when cellulose was present in the culture medium, but higher specific activities were achieved with cellobiose or sugarcane bagasse. Xylose or glucose (1%) in the reaction medium stimulated β-glucosidase activity by about 2-fold in crude extracts from mycelia grown in sugarcane bagasse. The enzyme was purified by ammonium sulfate precipitation, followed by Sephadex G-200 and DEAE-cellulose chromatography, showing a single band in PAGE and SDS-PAGE. The β-glucosidase had a carbohydrate content of 43% and showed apparent molecular masses of 57 and 60 kDa, as estimated by SDS-PAGE and gel filtration, respectively. The optimal pH and temperature were 6.0 and 50°C, respectively. The purified enzyme was thermostable up to 60 min in water at 55°C and showed half-lives of 7 and 14 min when incubated in the absence or presence of 50 mM glucose, respectively, at 60°C. The enzyme hydrolyzed p-nitrophenyl-β-D-glucopyranoside, p-nitrophenyl-β-Dgalactopyranoside, p-nitrophenyl-β-D-fucopyranoside, p-nitrophenyl-β-D-xylopyranoside, o-nitrophenyl-β-Dgalactopyranoside, lactose, and cellobiose. The best synthetic and natural substrates were p-nitrophenyl-β-Dfucopyranoside and cellobiose, respectively. Purified enzyme activity was stimulated up to 2-fold by glucose or xylose at concentrations from 25 to 200 mM. The addition of purified or crude β-glucosidase to a reaction medium containing Trichoderma reesei cellulases increased the saccharification of sugarcane bagasse by about 50%. These findings suggest that H. grisea var. thermoidea β-glucosidase has a potential for biotechnological applications in the bioconversion of lignocellulosic materials.


cellobiase glucose-stimulated β-D-glucosidase H. grisea sugarcane bagasse agricultural residues thermophilic fungi 


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Copyright information

© The Microbiological Society of Korea and Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • Cesar Vanderlei Nascimento
    • 1
  • Flávio Henrique Moreira Souza
    • 1
  • Douglas Chodi Masui
    • 1
  • Francisco Assis Leone
    • 1
  • Rosane Marina Peralta
    • 2
  • João Atílio Jorge
    • 3
  • Rosa Prazeres Melo Furriel
    • 1
  1. 1.Department of Chemistry, Faculdade de Filosofia, Ciências e Letras de Ribeirão PretoUniversity of São PauloRibeirão PretoBrasil
  2. 2.Department of BiochemistryState University of MaringáMaringáBrasil
  3. 3.Department of Biology, Faculdade de Filosofia, Ciências e Letras de Ribeirão PretoUniversity of São PauloRibeirão PretoBrasil

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