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Updated: Jun 24, 2025

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军团菌通过具有独特催化机制的效应体来维持宿主细胞泛素稳定性
Jiaqi Fu1, Siying Li1, Hongxin Guan2
1Department of Respiratory Medicine, Center for Infectious Diseases and Pathogen Biology, Key Laboratory of Organ Regeneration and Transplantation of the Ministry of Education, State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, The First Hospital of Jilin University, Changchun 130021, China.
Research square
|June 3, 2024
概括
流感性肺炎菌 (Legionella pneumophila) 是一种流感性肺炎菌.
科学领域:
- 微生物学和分子生物学
- 宿主-病原体相互作用
- 乌比基的信号传递
背景情况:
- 莱吉欧内拉肺菌的发病过程涉及那些操纵宿主细胞过程的效应体.
- 赛德效应器家族逆转了无化,产生了潜在有害的基基 (PR-Ub).
- 在感染期间维持乌比奎丁平衡对于宿主细胞存活至关重要.
研究的目的:
- 阐明莱吉欧内拉肺炎菌对抗PR-Ub积累的机制.
- 为了确定参与排毒PR-Ub.Ub.的宿主或细菌因素.
- 描述所涉及的酶活性和新的翻译后修改.
主要方法:
- 生物化学测试以表征LnaB活动.
- 在试验室中复制PR-Ub修饰路径.
- 蛋白质的净化和表征.
- 对LnaB与Actin相互作用的分析.
主要成果:
- 效应器LnaB通过使用ATP将PR-Ub转化为ADP-ribosylated ubiquitin (ADPR-Ub) 的作用.
- 酶MavL进一步将ADPR-Ub加工成ADP-ribose和功能性无处不在素.
- 在被Actin激活后,LnaB在氨酸残留物上表现出自我AMPylation.
- LnaB活动依赖于细菌毒素中发现的保存的S-HxxxE动机.
结论:
- LnaB和MavL是新途径中的关键组成部分,用于在军团菌感染期间维持无素稳态.
- 蛋白质AMPylation被确定为一种新的翻译后修饰,涉及宿主-病原体信号传递.
- 该S-HxxxE基因对新发现的一类AMPylating酶的活性至关重要.
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