重塑阿尔多-基托降解酶的结合口袋,以提高立体选择性和活性
Jiafeng Niu1, Xiaoyu Zhu1, Huibing Chi1
1College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China.
研究人员设计了一种阿尔多基因减少酶 (AKR6D2) 酶,以有效地排毒食物和料中的脱氧尼瓦伦醇 (DON) 污染. 这种增强的酶为更安全的农产品提供了有前途的生物催化剂.
科学领域:
- 生物技术是生物技术.
- 酶学 是一种酶学.
- 食品安全 食品安全
背景情况:
- 在料和食品中脱氧尼瓦伦醇 (DON) 的污染构成重大风险.
- 生物修复提供了一个环保的解决方案,但有效的酶催化方法是有限的.
- 现有的酶往往缺乏实际应用所需的催化效率和立体选择性.
研究的目的:
- 识别和描述一种用于脱氧尼瓦伦醇 (DON) 排毒的新型酶.
- 设计一种具有改善催化活性和立体选择性的酶,用于减少DON.
- 通过模拟了解通过模拟增强酶性能的分子基础.
主要方法:
- 基因挖掘用于从*Devosia*菌株A6-243.3中识别aldo-keto减少酶 (AKR6D2) 的基因.
- 局部定向的突变生成产生AKR6D2变体 (W21A/G53N).
- 酶活性测定,立体选择性测定和分子动力学模拟.
主要成果:
- 鉴定出AKR6D2具有热稳定性,但对3 - 基托 - 脱氧尼瓦伦醇 (3 - 基托 - DON) 减少的立体选择性较差.
- 改造的W21A/G53N突变体在催化活性增加了330倍,对3-epi-deoxynivalenol (3-epi-DON) 的立体选择性高于99%.
- 分子动力学模拟显示了突变者有利的反应前状态,有利于*R*配置产物形成.
结论:
- 工程 AKR6D2 是一种强大的生物催化剂,用于脱氧尼瓦伦醇 (DON) 排毒.
- 酶工程显著提高了催化效率和立体选择性.
- 这种方法为减轻食品和料中DON污染提供了可行的策略.
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