Corn seeds as bioreactors for the production of phytase in the feed industry

文献类型： 外文期刊

第一作者： Chen, Rumei

作者： Chen, Rumei;Zhang, Chunyi;Yang, Wenzhu;Zhou, Xiaojin;Sun, Cheng;Chen, Ping;Fan, Yunliu;Chen, Rumei;Zhang, Chunyi;Xue, Guangxing;Yang, Wenzhu;Zhou, Xiaojin;Sun, Cheng;Chen, Ping;Fan, Yunliu;Yao, Bin;Zhang, Junmin

作者机构：

关键词： Phytase;Corn endosperm;Phosphate;Phytate;Animal feed

期刊名称：JOURNAL OF BIOTECHNOLOGY （ 影响因子：3.307； 五年影响因子：3.778 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Corn seed is a major ingredient of animal feed worldwide. However, it contains phytate, a major phosphate storage form that is unavailable to monogastric animals like pigs and poultry. We report a transgenic corn with bioavailable phosphate, achieved by seed-specific overexpression of Aspergillus niger phytase, an enzyme catalyzing the release of phosphate from phytate. We obtained maximal phytase activity of 125 FTU/g kernels, 1000-fold above that of the wild type, with 1000g of kernels containing up to 67 times the feed industry requirement. Enzymatic characterization of Zea mays recombinant phytase (ZmrPhy) showed it to be equivalent to yeast (Pichia pastoris) recombinant phytase (PprPhy), a commercially available phytase product. An animal feeding trial demonstrated that ZmrPhy had similar nutritional effects on broiler chickens to PprPhy in terms of reducing inorganic phosphorus addition to feed and phosphate excretion in animal manure. These results suggest that transgenic phytase corn can be used directly in the feed industry. Experiments were conducted to assess the food safety of the corn; the results demonstrated no difference versus regular corn. This is the first genetically modified corn officially issued with a biosafety certificate in China and has great potential in the animal feed industry

分类号： Q81

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