Regulatory Functions of PurR in Yersinia pestis: Orchestrating Diverse Biological Activities
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Published:2023-11-17
Issue:11
Volume:11
Page:2801
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ISSN:2076-2607
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Container-title:Microorganisms
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language:en
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Short-container-title:Microorganisms
Author:
Xiao Liting12, Jin Junyan2, Song Kai2, Qian Xiuwei12, Wu Yarong2ORCID, Sun Zhulin2, Xiong Ziyao2, Li Yanbing2, Zhao Yanting2, Shen Leiming2, Cui Yiming2, Yao Wenwu2ORCID, Cui Yujun12, Song Yajun12ORCID
Affiliation:
1. School of Basic Medical Sciences, Anhui Medical University, Hefei 230032, China 2. State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing 100071, China
Abstract
The bacterium Yersinia pestis has developed various strategies to sense and respond to the complex stresses encountered during its transmission and pathogenic processes. PurR is a common transcriptional regulator of purine biosynthesis among microorganisms, and it modulates the transcription level of the pur operon to suppress the production of hypoxanthine nucleotide (IMP). This study aims to understand the functions and regulatory mechanisms of purR in Y. pestis. Firstly, we constructed a purR knockout mutant of Y. pestis strain 201 and compared certain phenotypes of the null mutant (201-ΔpurR) and the wild-type strain (201-WT). The results show that deleting purR has no significant impact on the biofilm formation, growth rate, or viability of Y. pestis under different stress conditions (heat and cold shock, high salinity, and hyperosmotic pressure). Although the cytotoxicity of the purR knockout mutant on HeLa and 293 cells is reduced, the animal-challenging test found no difference of the virulence in mice between 201-ΔpurR and 201-WT. Furthermore, RNA-seq and EMSA analyses demonstrate that PurR binds to the promoter regions of at least 15 genes in Y. pestis strain 201, primarily involved in purine biosynthesis, along with others not previously observed in other bacteria. Additionally, RNA-seq results suggest the presence of 11 potential operons, including a newly identified co-transcriptional T6SS cluster. Thus, aside from its role as a regulator of purine biosynthesis, purR in Y. pestis may have additional regulatory functions.
Funder
National Natural Science Foundation of China
Subject
Virology,Microbiology (medical),Microbiology
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