来自Aspergillus flavusus的新型热友性OYE的结构和功能表征
Na Li1, Yuan Wang1, Yinyin Meng2
1College of Biological Engineering, Henan Unsssiversity of Technology, 100 Lianhua Street, Zhengzhou, 450001, Henan, China.
Applied microbiology and biotechnology
|January 17, 2024
概括
一种新型的热爱性类似的老黄色酶 (OYE),AfOYE1,是从阿斯伯吉洛斯黄菌中发现的. 这种生物催化剂在不对称的烯降解方面表现出良好的酶选择性,并为工业应用提供了潜力.
科学领域:
- 生物催化剂是一种生物催化剂.
- 酶学 是一种酶学.
- 蛋白质工程是指蛋白质工程.
背景情况:
- 旧黄色酶 (OYE) 是激活的不对称降解的关键生物催化剂.
- 菌OYE代表了生物催化剂的大部分未开发资源.
- 扩大OYE酶工具箱对于推进合成化学至关重要.
研究的目的:
- 为了识别和表征一种新型的热爱型眼睛,来自Aspergillus flavus.
- 调查新OYE的基质范围,酶选择性和催化机制.
- 确定OYE的晶体结构,以获得结构洞察力.
主要方法:
- 鉴定和克隆来自Aspergillus flavus的OYE基因.
- 生物化学特征,包括热稳定性,最佳温度和pH分析.
- 酶活性测定与各种基基质和酶选择性测定.
- 进行X射线晶体学以确定酶的三维结构.
- 通过定位突变和运动研究来研究催化机制.
主要成果:
- 确定了一种新的热友性OYE,称为AfOYE1,其半衰期 (T1/2) 为60°C,在45°C处具有最佳活性.
- AfOYE1表现出广泛的基质接受性和高的对亲性基因的反抗选择性 (>99% ee).
- 在2-methylcyclohexenone的生物减少中观察到意想不到的 (S) 类固醇选择性.
- 晶体结构显示出一个深,狭窄的活性部位,埋藏着一种黄素单核酸 (FMN) 辅因子.
- 催化三元组被确定为His211,His214和Tyr216.
结论:
- AfOYE1是一种强大的,高度选择性的生物催化剂,在不对称化中具有工业应用的潜力.
- AfOYE1的结构特征有助于其独特的催化性能和基质结合.
- 这一发现扩大了可用于可持续化学合成的可用OYE产品库.
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