在Legionella pneumophila的HipBST毒素-抗毒素系统中,尽管结构一致,但功能多样化
Jordan D Lin1, Peter J Stogios2, Kento T Abe1,3
1Department of Molecular Genetics, University of Toronto , Toronto, Ontario, Canada.
mBio
|October 11, 2023
概括
这项研究描述了一种高度保守的毒素-抗毒素 (TA) 系统,HipBSTLp,在Legionella pneumophila*. 研究人员驳斥了其毒素双功能性的说法,扩大了对TA系统的了解.
科学领域:
- 微生物学 微生物学
- 遗传学 遗传学是一种遗传学.
- 分子生物学分子生物学
背景情况:
- 毒素-抗毒素 (TA) 系统是细菌基因组中广泛存在的寄生虫遗传元素.
- 这些系统通常是横向交换的,并且在菌株之间保存不良.
- 在 *Legionella pneumophila* 中的三部分 HipBSTLp 系统是一个例外,显示了高度的保护.
研究的目的:
- 为了描述三方TA系统的特征,HipBSTLp在Legionella pneumophila中.
- 分析HipBSTLp和大肠杆菌*分裂-HipA系统 (HipBSTEc) 之间的差异.
- 调查HipBSTLp系统的功能,并驳斥毒素双功能性的说法.
主要方法:
- 对Legionella*物种基因组的生物信息分析.
- HipBSTLp系统的分子表征.
- 毒素-抗毒素成分的结构分析.
- 功能性测试以确定毒素活性和毒性作用.
主要成果:
- 在Legionella*物种中鉴定和表征了一种高度保存的三方TA系统,HipBSTLp.
- HipBSTLp是大肠杆菌*分裂-HipA系统 (HipBSTEc) 的一个遥远的同源体.
- 提供了证据,驳斥了毒素HipTLp作为L.pneumophila*毒性蛋白的双功能性质.
结论:
- 该研究扩大了对分拆HipA系统架构的理解.
- 突出了在保存的TA系统中新生物发现的潜力.
- 澄清了HipTLp的功能作用,不包括毒性功能.
相关概念视频
Gram-negative Bacterial Protein Secretion Systems
30
Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...
30
Defense Against Bacterial Pathogens
1.4K
The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
1.4K
Formation of Lipopolysaccharides
24
Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin,...
24
Diversity of Protists II
22
Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
22
Protein Complexes with Interchangeable Parts
2.6K
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
2.6K
Gene Regulation in Microbial Communities: Quorum Sensing
23
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
23


