Delivery, structure, and function of bacterial genotoxins.

Delivery, structure, and function of bacterial genotoxins.
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细菌基因毒素的传递、结构和功能。

DOI:
10.1080/21505594.2022.2097417
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发表时间:
2022-12
期刊:
影响因子:
5.2
通讯作者:
--
中科院分区:
生物学2区
文献类型:
--
作者:

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细菌基因毒素是由多种病原体产生的多肽或蛋白质毒力因子,其在靶宿主细胞中造成单链断裂(SSB)和/或双链DNA断裂(DSB)。如果宿主DNA的影响不能及时解决,可能会发生宿主细胞凋亡、细胞衰老和/或甚至细菌病原体相关的癌症。两种多蛋白AB毒素,由超过30种细菌病原体产生的细胞致死膨胀毒素(CDT)和来自伤寒沙门氏菌的伤寒毒素,以及称为大肠杆菌素的小聚酮肽,其引起DNA链间交联和随后的DSB是最具特征的细菌基因毒素。利用这三个例子,本文综述了这些毒素传递到靶宿主细胞的细胞核,并发挥其遗传毒性功能的结构和功能水平的机制。
Bacterial genotoxins are peptide or protein virulence factors produced by several pathogens, which make single-strand breaks (SSBs) and/or double-strand DNA breaks (DSBs) in the target host cells. If host DNA inflictions are not resolved on time, host cell apoptosis, cell senescence, and/or even bacterial pathogen-related cancer may occur. Two multi-protein AB toxins, cytolethal distending toxin (CDT) produced by over 30 bacterial pathogens and typhoid toxin from Salmonella Typhi, as well as small polyketide-peptides named colibactin that causes the DNA interstrand cross-linking and subsequent DSBs is the most well-characterized bacterial genotoxins. Using these three examples, this review discusses the mechanisms by which these toxins deliver themselves into the nucleus of the target host cells and exert their genotoxic functions at the structural and functional levels.
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