Overexpression of an Acidic Endo-beta-1,3-1,4-glucanase in Transgenic Maize Seed for Direct Utilization in Animal Feed

文献类型： 外文期刊

第一作者： Zhang, Yuhong

作者： Zhang, Yuhong;Zhou, Xiaojin;Chen, Rumei;Zhang, Wei;Xu, Xiaolu;Yang, Peilong;Meng, Kun;Luo, Huiying;Yao, Bin;Meng, Qingchang;Yuan, Jianhua

作者机构：

期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2013 年 8 卷 12 期

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收录情况： SCI

摘要： Background: Incorporation of exogenous glucanase into animal feed is common practice to remove glucan, one of the anti-nutritional factors, for efficient nutrition absorption. The acidic endo-beta-1,3-1,4-glucanase (Bgl7A) from Bispora sp. MEY-1 has excellent properties and represents a potential enzyme supplement to animal feed. Methodology/Principal Findings: Here we successfully developed a transgenic maize producing a high level of Bgl7AM (codon modified Bgl7A) by constructing a recombinant vector driven by the embryo-specific promoter ZM-leg1A. Southern and Western blot analysis indicated the stable integration and specific expression of the transgene in maize seeds over four generations. The beta-glucanase activity of the transgenic maize seeds reached up to 779,800 U/kg, about 236-fold higher than that of non-transgenic maize. The beta-glucanase derived from the transgenic maize seeds had an optimal pH of 4.0 and was stable at pH 1.0-8.0, which is in agreement with the normal environment of digestive tract. Conclusion/Significance: Our study offers a transgenic maize line that could be directly used in animal feed without any glucanase production, purification and supplementation, consequently simplifying the feed enzyme processing procedure.

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