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Expression of Trichoderma viride endoglucanase III in the larvae of silkworm, Bombyx mori L. and characteristic analysis of the recombinant protein

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Abstract

Endoglucanase is a part of cellulase which hydrolyzes cellulose into glucose. In this study, we cloned endoglucanase III (EG III) gene from Trichoderma viride strain AS 3.3711 using a PCR-based exon splicing method, and expressed EG III recombinant protein in both silkworm BmN cell line and silkworm larvae with an improved Bac-to-Bac/BmNPV mutant baculovirus expression system, which lacks the chiA and v-cath genes of Bombyx mori nucleopolyhedrovirus (BmNPV). The result showed that around 45 kDa protein was visualized in BmN cells at 48 h after the second generation recombinant mBacmid/BmNPV/EG III baculovirus infection. The enzymes from recombinant baculoviruses infected silkworms exhibited significant maximum enzyme activity at the environmental condition of pH 8.0 and temperature 50°C, and increased 20.94 and 19.13% compared with that from blank mBacmid/BmNPV baculoviruses infected silkworms and normal silkworms, respectively. It was stable at pH range from 5.0 to 9.0 and at temperature range from 40 to 60°C. It provided a possibility to generate transgenic silkworms expressing bio-active cellulase, which can catabolize dietary fibers more efficiently, and it might be of great significance for sericulture industry.

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Acknowledgments

The work was supported by the National Basic Research Program of China under grand no. 2005CB121003 and the National Natural Science Foundation of China (No. 30972141/C120110) and the Hi-Tech Research and Development Program of China (No. 2008AA10Z132 and 2006AA10A119).

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Correspondence to Yun-gen Miao.

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Li, Xh., Zhang, P., Wang, Mx. et al. Expression of Trichoderma viride endoglucanase III in the larvae of silkworm, Bombyx mori L. and characteristic analysis of the recombinant protein. Mol Biol Rep 38, 3897–3902 (2011). https://doi.org/10.1007/s11033-010-0505-4

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  • DOI: https://doi.org/10.1007/s11033-010-0505-4

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