活性中心的灵活性会影响Penicillium canescens xylanase E的热稳定性和活性
Anna Dotsenko1, Igor Sinelnikov1, Aleksandra Rozhkova1
1Federal Research Centre «Fundamentals of Biotechnology», Russian Academy of Sciences, Moscow, 119071, Russia.
Biochimie
|October 11, 2023
概括
工程化西兰酶E显示了对工业应用的更好的热稳定性和活性. 这种增强的酶适用于料添加剂和纸/纸工艺.
科学领域:
- 酶学 是一种酶学.
- 生物技术是生物技术.
- 蛋白质工程是指蛋白质工程.
背景情况:
- 克西兰酶是重要的工业酶,用于料添加剂,纸和纸,以及食品/饮料生产.
- 工业过程需要氧化酶在较长时间内承受高温 (60-90°C).
- 甘氨酸酸酶家族10 (GH10) 基氨酸酶具有很高的热稳定性和对谷物抑制剂的抗性,使其成为料应用的理想选择.
研究的目的:
- 为了增强来自Penicillium canescens的GH10氧化酶E的热稳定性和活性,用于工业应用.
- 通过分子动力学模拟来研究改善酶性能的结构基础.
主要方法:
- 蛋白质工程被用来提高GH10西兰酶E的热稳定性.
- 酶活性测定在各种温度 (40-70°C) 进行.
- 用分子动力学模拟来分析与野生类型相比,工程酶的结构灵活性和稳定性.
主要成果:
- 工程化西兰酶E在80°C下实现了2分钟的半失活期,远远超过野生类型的21秒.
- 在40-70°C的温度下,酶活性增加了22-48%.
- 分子动力学揭示了工程酶的三级结构灵活性降低,特别是在基质结合子位点 (-1和-2),具有改变的线圈和β转含量.
结论:
- 工程设计的GH10西兰酶E表现出优越的热稳定性和增强的活性,使其成为工业应用中更有效的酶.
- 结构修改有助于在苛刻的工艺条件下提高性能,例如料颗粒化和纸漂白.
- 这项研究提供了对蛋白质工程策略的见解,用于开发生物技术用途的强大的酶.
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