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C端多胺标签改变大肠杆菌的多酸盐激酶活性和对抑制的敏感性

Marvin Q Bowlin¹, Avery D Lieber¹, Abagail R Long¹

¹Department of Microbiology, University of Alabama at Birmingham Heersink School of Medicine, Birmingham, AL, USA.

Journal of molecular biology

|June 12, 2024

概括

使用histidine标签的多酸盐激酶1 (PPK1) 净化改变了酶活性. 一种C标签净化方法揭示了真正的PPK1行为,这对于理解聚酸盐合成和开发抗病毒药物至关重要.

科学领域:

微生物学微生物学
酶学是一种酶学.
生物化学生物化学

背景情况:

聚酸盐基酶1 (PPK1) 的聚酸盐 (polyP) 合成是由大肠杆菌中的环境压力因素触发的.
PPK1对于病原体的毒性至关重要,也是抗毒性药物发现的目标.
对PPK1活性和聚聚合成的调节机制尚不清楚.

研究的目的:

调查PPK1.1的监管机制.
在体内积累更多的聚烯的PPK1*突变体的特征.
为PPK1开发可靠的净化策略,以实现准确的体外研究.

主要方法:

比较PPK1净化使用Ni-亲和色谱与C-终端的多胺标签与C-终端的C-标签.
使用替代净化策略的野生类型和PPK1*酶的表征.
在体外评估PPK1活性,寡合体状态,动力学和对抑制剂的反应.

主要成果:

C终端的多胺标签显著改变了PPK1的内在特性,包括特定活性,寡合体状态和动力学.
另一种C-tag净化策略保留了原生PPK1的特征.
野生类型和PPK1*酶在C标签净化后,在寡合分布,酶活性和抑制抵抗方面表现出关键差异.

结论:

C终端的多胺标签不适合PPK1净化,并且可以混体外研究.
准确地描述PPK1需要适当的净化方法,比如C标签策略.
这些发现需要重新评估先前的体外研究和抑制剂查,涉及用histidine标记的PPK1.

关键词:

亲缘关系染色图学亲缘关系染色图学酶抑制剂酶抑制剂酶抑制剂酶活性的酶活动.酵素净化酶的净化过程压力反应应对压力的反应.

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