来自Candida parapsilosis的结构引导的工程尿氨酶具有pH和乙醇耐受性,以有效地降解中国大米葡萄酒中的乙烯基碳酸盐
Xian Zhang1, Yao Zhang1, Tingting Fan1
1College of Bioengineering, Sichuan University of Science & Engineering, Yinbin, China.
Ecotoxicology and environmental safety
|April 16, 2024
概括
工程化尿酸酶 (UH) 变种表现出增强的稳定性和活性,用于降解发酵食品中的致癌物乙基酸盐 (EC). 这些改进的酶为更安全的食品生产和工业应用提供了潜力.
科学领域:
- 生物化学 生物化学
- 酶工程是什么? 酶工程是什么?
- 食品科学 食品科学 食品科学
背景情况:
- 尿酸酶 (UH) 降解乙烯碳酸盐 (EC),这是发酵食品中的致癌物.
- 目前的超高温稳定性和活动限制了其工业应用.
研究的目的:
- 为了改造Candida parapsilosis尿酶 (cpUH),以提高稳定性和活性.
- 为了增强发酵产品中乙基碳酸盐 (EC) 的降解.
主要方法:
- 用局部定向的突变发生法来创造G246A和N194V/G246A突变.
- 评估了酶活性,热稳定性和pH稳定性.
- 分子动力学和对接模拟分析了酶基质相互作用.
主要成果:
- 突变G246A和N194V/G246A的催化效率 (Kcat/Km) 比野生型 (WT) 高得多.
- 在工程变体中观察到增强的热和pH稳定性.
- 与WT相比,突变分子在米酒中显示出更高的EC降解.
- 分子模拟证实了酶稳定性和键的增加.
结论:
- 局部定向突变发生成功改善了cpUH的稳定性和活性.
- 工程cpUH变种显示出对工业EC降解的前景.
- 酶修饰促进了更安全的食品加工,并减少了致癌物质的暴露.
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