Abstract
β-1,3-1,4-glucanase (EC3.2.1.73) as an important industrial enzyme has been widely used in the brewing and animal feed additive industry. To improve expression efficiency of recombinant β-1,3-1,4-glucanase from Bacillus licheniformis EGW039(CGMCC 0635) in methylotrophic yeast Pichia pastoris GS115, the DNA sequence encoding β-1,3-1,4-glucanase was designed and synthesized based on the codon bias of P. pastoris, the codons encoding 96 amino acids were optimized, in which a total of 102 nucleotides were changed, the G+C ratio was simultaneously increased from 43.6 to 45.5%. At shaking flask level, β-1,3-1,4-glucanase activity is 67.9 and 52.3 U ml−1 with barley β-glucan and lichenan as substrate, respectively. At laboratory fermentor level, the secreted protein concentration is approximately 250 mg l−1. The β-1,3-1,4-glucanase activity is 333.7 and 256.7 U ml−1 with barley β-glucan and lichenan as substrate, respectively; however, no activity of this enzyme on cellulose is observed. Compared to the nonoptimized control, expression level of the optimized β-1,3-1,4-glucanase based on preferred codons in P. pastoris shown a 10-fold higher level. The codon-optimized enzyme was approximately 53.8% of the total secreted protein. The optimal acidity and temperature of this recombinant enzyme were pH 6.0 and 45°C, respectively.
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Acknowledgement
This study is supported by two Chinese National Hi-Tech R&D Programs (Chinese “863” Program No. 2001 AA 246041 and 2004 AA 246040). Da Teng and Ying Fan have contributed equally to this work.
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Teng, D., Fan, Y., Yang, Yl. et al. Codon optimization of Bacillus licheniformis β-1,3-1,4-glucanase gene and its expression in Pichia pastoris . Appl Microbiol Biotechnol 74, 1074–1083 (2007). https://doi.org/10.1007/s00253-006-0765-z
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DOI: https://doi.org/10.1007/s00253-006-0765-z