Purification and Characterization of Termite Endogenous β-1,4-Endoglucanases Produced in Aspergillus oryzae

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概要

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• Although termites are known to have a highly efficient lignocellulose-digesting system, mass production of native endogenous cellulases of termites has failed in Escherchia coli, and in Saccharomyces cerevisiae, and it has not been accomplished. Here we report the successful production, purification, and characterization of two termite endogenous β-1,4-endoglucanases, RsEG and NtEG, from the salivary gland of Reticulitermes speratus and the midgut of Nasutitermes takasagoensis respectively, using Aspergillus oryzae as host. Thin-layer chromatography analysis showed that both enzymes hydrolyzed the β-1,4-cellulosic linkage of cellodextrin into cellobiose and glucose. Kinetic studies indicated that the specific activity and Vmax values of the two enzymes were significantly higher than those of previously reported fungal and bacterial endoglucanases.

著者

• Kitamoto Katsuhiko

  Department of Biotechnology, The University of Tokyo

• WATANABE Hirofumi

  National Institute of Agrobiological Sciences

• Arioka Manabu

  Department Of Biotechnology University Of Tokyo

• Hirayama Kayoko

  Department of Biotechnology, The University of Tokyo

• Tokuda Gaku

  Tropical Biosphere Research Center, COMB, University of the Ryukyus

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