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在Pseudomonas aeruginosa中激活LasB:通过定数感应介导的自动激活抑制剂释放

Cheol Seung Lee¹, Xi-Hui Li^1,2, Chae-Ran Jeon¹

¹Department of Pharmacy, College of Pharmacy, Pusan National University, Busan 46241, Republic of Korea.

Journal of microbiology (Seoul, Korea)

|March 5, 2025

概括

伪气菌弹性酶B (LasB) 需要依赖于定数感应 (QS) 的抑制剂来激活. 这项研究表明,QS缺乏的菌株产生了LasB抑制剂,防止过早激活,直到QS发出信号.

科学领域:

微生物学微生物学
细菌病原体的产生
蛋白质酶生物化学蛋白质酶生物化学

背景情况:

Pseudomonas aeruginosa 分泌关键蛋白酶 (LasB,PIV,LasA),对感染至关重要.
据信LasB激活是自催化性的,但之前已经表明它依赖于QS.
以前的研究表明,LasB需要依赖于QS的因子来激活,在QS缺陷的突变种中保持不活跃.

研究的目的:

为了研究在Pseudomonas aeruginosa中激活LasB的机制.
为了确定影响LasB激活的因素,在质量检测 (QS) 缺陷的菌株中.
挑战自动激活假设,并提出一个对LasB调节的更新模型.

主要方法:

在QS缺乏的P. aeruginosa菌株中过度表达非活性LasB.
在大肠杆菌中表达全长的LasB,一个异质系统.
使用纯化的活性LasB和来自QS阳性和QS缺陷菌株的培养超体进行抑制试验.

主要成果:

在QS缺陷菌株中过度表达的非活性LasB被处理,可以在净化后重新激活,表明存在抑制剂.
在大肠杆菌中表达的LasB显示正常的处理和激活,缺乏内源抑制剂或激活剂.
纯化的活性LasB被QS缺陷菌株的培养超物显著抑制,但不是QS阳性菌株.

结论:

在QS缺乏的Pseudomonas aeruginosa菌株中存在一个LasB抑制剂.
在没有这种抑制剂的情况下,LasB可以在没有额外的激活剂的情况下自动激活.
依赖于QS的LasB激活器可能通过中和LasB抑制剂来起作用,防止过早激活.

关键词:

拉斯维加斯拉斯维加斯伪omonas aeruginosa 这种类型的病毒.弹性酶弹性酶是一种.蛋白质酶蛋白质酶是一种蛋白质.蛋白酶抑制是一种抑制.议员数量检测是指对议员数量进行检测.

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