引入多重二硫化键增加了转胺酶的热稳定性
Takuto Ono1, Kazutoshi Takahashi2, Yoshinori Hirao1
1Research Institute for Bioscience Products & Fine Chemicals, Ajinomoto Co., Inc., 1-1 Suzuki-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa-ken, 210-8681, Japan.
Scientific reports
|July 2, 2025
概括
将二硫化键添加到微生物转胺酶 (MTG) 中,显著提高了其热稳定性. 这一策略通过加强关键蛋白质区域来提高工业应用的酶性能.
科学领域:
- 生物化学 生物化学
- 酶学 是一种酶学.
- 蛋白质工程是指蛋白质的工程.
背景情况:
- 微生物转质氨酶 (MTG) 由于其蛋白质交叉链接能力,在食品和医疗行业中至关重要.
- 目前改善MTG热稳定的方法主要使用点突变,在N端外的区域取得有限的成功.
- 已知二硫化物键可以增强蛋白质的稳定性,但它们在MTG中的战略位置需要进一步研究.
研究的目的:
- 为了研究引入额外的二硫化物 (S-S) 键对微生物转胺酶 (MTG) 突变的热稳定性的影响.
- 确定非N终端地区的S-S债券是否可以与现有的N终端债券一起进一步提高MTG的耐热性.
主要方法:
- 使用局部定向突变发生,将额外的二硫化物键引入到MTG结构中.
- 进行了热稳定性测试,以量化工程MTG变体的耐热性.
- 评估了酶活性和基质特异性,以确保功能完整性.
主要成果:
- 除了N终端的S-S债券外,在N终端以外的地区引入S-S债券,显著提高了MTG的热稳定性.
- 两个S-S债券的工程MTG变体保持了其催化活性和基质特异性.
- 这些发现强调了蛋白质稳定的一种顺序方法的重要性:首先加强最弱点,然后加强其他区域.
结论:
- 战略性地引入多重二硫化物键是一种有效的方法,可以显著提高MTG的热稳定性.
- 这种方法为开发适用于各种工业应用的强大的MTG变体提供了有前途的战略.
- 这项研究强调了稳定关键蛋白质区域的原则,以获得最佳的酶性能和寿命.
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