来自耐热酵母Ogataea parapolymorpha的NAD+依赖形式脱酶:N-终端序列的特性和蛋白质工程
Anastasia A Pometun1,2, Leonid A Shaposhnikov3,2, Sofiya A Zubanova2
1Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology", Russian Academy of Sciences, Moscow, 119071, Russia. aapometun@gmail.com.
Biochemistry. Biokhimiia
|September 28, 2023
概括
这项研究详细介绍了从酵母中形成脱酶 (FDH),发现它具有高度的热稳定性. 研究了N端的修改,揭示了与甘氨酸相比,氨酸的添加增强了稳定性.
科学领域:
- 生物化学和分子生物学
- 酶学 是一种酶学.
- 蛋白质工程是指蛋白质工程.
背景情况:
- 从耐热酵母Ogataea parapolymorpha DL 1 (OpaFDH) 的形式脱酶 (FDH) 的基因之前已经被克隆.
- 重组OpaFDH与N端甘氨酸残留物 (OpaFDH_GK) 在大肠杆菌中成功产生高产量 (>1 g/L).
- 本研究的重点是将OpaFDH与其他FDH进行比较,并调查N端修改的影响.
研究的目的:
- 进行OpaFDH与来自不同来源的甲酸盐脱酶的详细比较.
- 阐明N端氨基酸残留对OpaFDH的热稳定性和运动性质的影响.
- 为了设计和表征OpaFDH变体与改变的N-终端.
主要方法:
- 在大肠杆菌中产生复合的OpaFDH变体 (OpaFDH_K,OpaFDH_AK和一个多胺标记的变体).
- 对不同OpaFDH变体的热稳定性和失活动学的比较分析.
- 评估运动参数和净化效率.
主要成果:
- 在已知的真核生物形式脱酶中,OpaFDH具有最高的热稳定性.
- 添加一个N端的氨酸残留物显著提高了热稳定性,与糖氨酸残留物相比,将热无活化速率常数降低了四倍.
- 一种带有多胺标记的变种可轻松净化,对动力学影响最小,尽管热稳定性略有降低,可用0.5M NaCl.Cl 恢复.
结论:
- OpaFDH是一种高度热稳定的真核生物形式脱酶.
- N-终端工程,特别是氨酸添加,是进一步提高OpaFDH的热稳定性的可行策略.
- 这些发现为增强酶稳定性和高效净化提供了对蛋白质工程的见解.
关键词:
奥加泰亚 (Ogataea parapolymorpha) DL 1 1 DL 1 是一个多重形态动物.具有催化特性,具有催化特性.在大肠杆菌中表达.形成脱酶的形式.净化 净化 净化 净化在位点导向的突变发生.热稳定性的热稳定性耐热酵母酵母是一种耐热酵母.更多相关视频
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