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莱普托斯皮拉ClpP突变变种与ClpX,乙烯基和触发因子相关,显示了前所未有的功能获取

Surbhi Kumari¹, Anusua Dhara¹, Manish Kumar¹

¹Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India.

International journal of biological macromolecules

|January 30, 2024

概括

两种Leptospira问答的ClpP突变 (LinClpP2^S40AK41N和LinClpP2^Y62A) 在酶活性中表现出功能的增加. 这些突变物可以独立地降解基质,为ClpP激活提供了新的见解.

科学领域:

微生物学微生物学
生物化学生化学
分子生物学分子生物学

背景情况:

莱普托斯皮拉质疑ClpP (LinClpP) 蛋白酶对细菌生存至关重要,包括两个异构体,LinClpP1和LinClpP2.
了解LinClpP的调节和激活机制对于开发新型抗菌策略至关重要.

研究的目的:

为了研究针对LinClpP异型体中的关键残留物的特定突变的功能影响.
探索单独的LinClpP突变的活性,在异质复合体中,以及在活性化剂如乙脱1 (ADEP1) 和触发因子 (LinTF) 的存在下.

主要方法:

通过位点导向的突变发生被用来产生五种LinClpP突变:LinClpP1^E170D,LinClpP1^N172D,LinClpP2^IG_del,LinClpP2^S40AK41N,以及LinClpP2^Y62A.
蛋白酶活性测定是在纯化的突变变异型及其异构复合体上进行的.
使用动态光散射来分析ADEP1结合突变体的结构变化.

主要成果:

两个突变,LinClpP2^S40AK41N和LinClpP2^Y62A,在酶活性中表现出功能的增加 (GOF).
这些GOF突变的ADEP1结合的异质复合体与ADEP结合的野生类型LinClpP1P2.2相比,显示出明显更高的蛋白酶活性 (1.7-1.5倍).
在LinTF的存在下,GOF突变异体复合体的酸酶活性增加了3倍.
LinClpP2^IG_del突变和LinClpP1^E170D/LinClpP1^N172D突变分别没有或减少了活性,而它们与其他异构体的异构体的活性较低.

结论:

这些LinClpP2^S40AK41N和LinClpP2^Y62A突变代表了ClpP.
这些GOF突变可以独立于LinClpP1异型降解基质,突出了以前未被描述的激活途径.
这些发现为细菌ClpP蛋白酶的全调节和激活机制提供了新的见解.

关键词:

这是一种基化 (acyldepsipeptide).凯西诺分析蛋白质酶的作用功能获取 - 功能获取莱普托斯皮拉 (Leptospira) 是一个类动物.

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