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通过定向进化,改善了来自Enterovibrio norvegicus的氧酶的催化性能和分子洞察力

Bingjie Zhang¹, Huibing Chi¹, Juan Shen¹

¹College of Food Science and Technology, Nanjing Agricultural University, Nanjing, China.

Frontiers in bioengineering and biotechnology

|December 4, 2023

概括

定向进化增强了来自Enterovibrio norvegicus (EnLOX) 的脂氧酶 (LOX),用于工业应用. 一种新型突变 (EAHNWG) 显示出8.25倍高的活性和更好的热稳定性,为更广泛的酶使用铺平了道路.

科学领域:

生物技术是生物技术.
酵素工程是什么意思酵素工程
蛋白质工程是指蛋白质的工程.

背景情况:

脂氧酶 (LOX) 是一种有前途的酶,用于食品和制药应用.
目前的局限性包括低催化活性和低温稳定性,阻碍工业使用.
定向进化提供了一种克服这些局限性的策略.

研究的目的:

通过使用定向进化来增强Enterovibrio norvegicus LOX (EnLOX) 的催化活性和热稳定性.
为了确定负责提高酶性能的特定突变.
为未来LOX.的酶修饰提供洞察力.

主要方法:

定向进化策略涉及易出错的PCR和DNA混杂.
EnLOX突变体的构建和表征.
生物化学测试以确定特定活性和催化效率.
热稳定性测试 (t1/2,50°C). 热稳定性测试 (t1/2,50°C). 热稳定性测试 (t1/2,50°C). 热稳定性测试 (t1/2,50°C). 热稳定性测试 (t1/2,50°C). 热稳定性测试 (t1/2,50°C). 热稳定性测试 (t1/2,50°C). 热稳定性测试 (t1/2,50°C).
分子动力学模拟和结构分析.

主要成果:

四种不同的EnLOX突变体表现出显著增加的特异性活性.
突变D95E/T99A/A121H/S142N/N444W/S613G (EAHNWG) 与野生类型 (WT) 相比,其特定活性增加了8.25倍.
在EAHNWG中,催化效率提高 (13.61s-1 μM-1),温度稳定性提高 (t1/2.50°C 6.44小时).
结构分析显示,EAHNWG中减少了键,增加了疏水性相互作用,并增强了lid域的灵活性.

结论:

定向进化成功地改善了EnLOX的催化活性和热稳定性.
在EAHNWG突变呈现一个非常有前途的候选人工业应用.
结构洞察力指导LOX酶的进一步工程,以获得最佳性能.

关键词:

肠杆菌诺维基克斯 (Enterovibrio norvegicus) 是一个有约束力的自由能源.催化活动的催化活动.指导进化是指导进化的.氧化原酶的使用分子动态模拟分子动态模拟结构分析,结构分析分析.

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