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
作者： Zhang, Yuhong 1 ; Xu, Xiaolu 2 ; Zhou, Xiaojin 1 ; Chen, Rumei 1 ; Yang, Peilong 2 ; Meng, Qingchang 3 ; Meng, Kun 2 ; Lu 1 ;
作者机构： 1.Chinese Acad Agr Sci, Biotechnol Res Inst, Beijing 100193, Peoples R China
2.Chinese Acad Agr Sci, Feed Res Inst, Minist Agr, Key Lab Feed Biotechnol, Beijing 100193, Peoples R China
3.Jiangsu Acad Agr Sci, Inst Food Crops, Nanjing, Jiangsu, Peoples R China
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
页码：
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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