High level expression of a synthetic gene encoding Peniophora lycii phytase in methylotrophic yeast Pichia pastoris

文献类型： 外文期刊

第一作者： Xiong, Ai-Sheng

作者： Xiong, Ai-Sheng;Yao, Quan-Hong;Peng, Ri-He;Zhang, Zhen;Xu, Fang;Liu, Jin-Ge;Han, Pei-Lai;Chen, Jian-Min

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关键词： MYOINOSITOL HEXAKISPHOSPHATE PHOSPHOHYDROLASES;HEAT-STABLE PHYTASE;ASPERGILLUS-FUMIGATUS;ESCHERICHIA-COLI;HETEROLOGOUS PROTEINS;MOLECULAR-CLONING;ACID-PHOSPHATASES;PHYTIC ACID;PURIFICATION;PHOSPHORUS

期刊名称：APPLIED MICROBIOLOGY AND BIOTECHNOLOGY （ 影响因子：4.813； 五年影响因子：4.697 ）

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收录情况： SCI

摘要： Phytase is widespread in nature. It has been used as a cereal feed additive that can enhance the phosphorus and mineral absorption in monogastric animals to reduce the level of phosphorus output in manure. Phytase of Peniophora lycii is a 6'-phytase, which owns high specific activity. To achieve a high expression level of 6'-phytase in Pichia pastoris, the 1,230-bp phytase gene of P. lycii was synthesized and optimized for codon usage, G+C content, as well as mRNA secondary structures. The gene constructs containing wild type or modified phytase gene coding sequences under the control of the highly-inducible alcohol oxidase gene (AOX1) promoter, the synthetic signal peptide (designated MF4I), which is a codon-modified Saccharomyces cerevisiae mating factor alpha-prepro-leader sequence, were used to transform P. pastoris. The P. pastoris strain that expressed the modified phytase gene (phy-pl-sh) with MF4I sequence produced 12.2 g phytase per liter of fluid culture, with the phytase activity of 10,540 U ml(-1). The yield of the modified phytase gene, with bias codon usage and MF4I signal, is 4.4 times higher than that of the wild type gene with MF4I signal and 13.6 times higher than that of the wild type gene with wild type S. cerevisiae signal. The recombinant phytase had one optimum pH (pH 4.5) and an optimum temperature of 50 degrees C. The P. pastoris strain expressed the modified 6-phytase gene, with the MF4I signal peptide showing great potential as a commercial phytase production system.

分类号： Q93

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