Synergistic Actions of Exo-Type Cellulases in the Hydrolysis of Cellulose with Different Crystallinities

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概要

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• The synergistic actions of pairs of seven different exo- and endo-type cellulases produced by Irpex lacteus (Ex-1 and En-1), Trichoderma reesei (CBH I, CBH II, and Endo-2), and Aspergilus niger (Exo-A and EG-1)were investigated using pure cellulosic materials with different crystallinities as substrates. A marked synergism was observed with sertatin combinations of exo-type cellulases, namely, CBH II and the oter exo-type cellulases (Ex-1,CBH I, or Exo-A), when saccharification activity against crystalline and amorphous celluloses was investigated. Differences between the modes of action of each exo-type cellulase alone and in combination are not clearly observed; the production of cellobiose was accelerated during the hydrolysis of crystalline and amorphous celluloses by the combinations of exo-type cellulases, and no effective synergistic actions of the combinations of exo-type cellulases were noted in the depolymerization of crystalline cellulose. However, the synergistic actions of exo-type cellulases with CBH II caused specific changes in the surface features of highly crystalline celluloses. Characteristic morphological changes in cotton fibers (erosion and cracking of fiber surfaces)were induced at increasing rates by the combination of CBH II and Ex-1 or Exo-A. In contrast, destruction and subdivision of fibrils, which resulted in the pronounced fibrillation of cotton fibers, were observed after the treatment of cotton fibers with CBH II and CBH I. It was suggested that CBH II may be one of the key enzymes involved in the synergistic actions during cellulose hydrolysis.

• 社団法人日本生物工学会の論文
• 1997-10-25

著者

• SHIROISHI Masahiro

  Department of Physics,Graduate School Science,University of Tokyo

• Nomura Masafumi

  Wakayama Research Laboratories Kao Corporation

• Shiroishi Masahiro

  Department Of Physics Graduate School Science University Of Tokyo

• Shiroishi Masahiro

  Department Of Physics Faculty Of Science University Of Tokyo

• Hoshino Eiichi

  Aset Euv Laboratory C-o Ntt Atsugi Research Center

• Hoshino E

  Tokyo Research Laboratories Kao Corporation

• KANDA Takahisa

  Department of Chemistry and Material Engineering, Faculty of Engineering, Shinshu University

• AMANO Yoshihiko

  Department of Chemistry and Material Engineering, Faculty of Engineering, Shinshu University

• Kanda Takahisa

  Department Of Chemistry And Material Engineering Faculty Of Engineering Shinshu University

• Amano Yoshihiko

  Department Of Chemistry And Material Engineering Faculty Of Engineering Shinshu University

• Nomura M

  Department Of Chemistry Faculty Of Sciences Science University Of Tokyo

• HOSHINO EIICHI

  Department of Chemistry and Material Engineering, Faculrt of Engineering, Shinshu University

• 城石 正弘

  Division Of Applied Biology Faculty Of Textile Science And Technology Shinshu University

• Arikawa Y

  Department Of Chemistry And Material Engineering Faculty Of Engineering Shinshu University

• Kuroyanagi Tomoko

  Faculty Of Textile Science And Technology Shinshu University

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