<italic toggle="yes">Salmonella</italic> Proteomic Profiling during Infection Distinguishes the Intracellular Environment of Host Cells

ABSTRACT Essential to bacterial pathogenesis, Salmonella enterica serovar Typhimurium (S. Typhimurium) has evolved the capacity to quickly sense and adapt to specific intracellular environment within distinct host cells. Here we examined S. Typhimurium proteomic remodeling within macrophages, allowi...

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Autores principales:	Zezhou Li, Yanhua Liu, Jiaqi Fu, Buyu Zhang, Sen Cheng, Mei Wu, Zhen Wang, Jiezhang Jiang, Cheng Chang, Xiaoyun Liu
Formato:	article
Lenguaje:	EN
Publicado:	American Society for Microbiology 2019
Materias:	Salmonella proteome bacterial infection mass spectrometry the his operon Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/292aac115f3a4b9e913de22c8233a82a
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spelling	oai:doaj.org-article:292aac115f3a4b9e913de22c8233a82a2021-12-02T19:47:34Z<italic toggle="yes">Salmonella</italic> Proteomic Profiling during Infection Distinguishes the Intracellular Environment of Host Cells10.1128/mSystems.00314-182379-5077https://doaj.org/article/292aac115f3a4b9e913de22c8233a82a2019-04-01T00:00:00Zhttps://journals.asm.org/doi/10.1128/mSystems.00314-18https://doaj.org/toc/2379-5077ABSTRACT Essential to bacterial pathogenesis, Salmonella enterica serovar Typhimurium (S. Typhimurium) has evolved the capacity to quickly sense and adapt to specific intracellular environment within distinct host cells. Here we examined S. Typhimurium proteomic remodeling within macrophages, allowing direct comparison with our previous studies in epithelial cells. In addition to many shared features, our data revealed proteomic signatures highly specific to one type of host cells. Notably, intracellular S. Typhimurium differentially regulates the two type III secretion systems (T3SSs) far more quickly in macrophages than in epithelial cells; bacterial flagellar and chemotaxis systems degenerate more quickly in macrophages than in HeLa cells as well. Importantly, our comparative analysis uncovered high levels of induction of bacterial histidine biosynthesis in macrophages but not in epithelial cells. Targeted metabolomic measurements revealed markedly lower histidine levels within macrophages. Intriguingly, further functional studies established that histidine biosynthesis that is defective (due to a hisG mutation) renders the bacterium (strain SL1344) hypersensitive to intracellular shortage of this amino acid. Indeed, another S. Typhimurium strain, namely, strain 14028s, with a fully functional biosynthetic pathway exhibited only minor induction of the his operon within infected macrophages. Our work thus provided novel insights into S. Typhimurium adaptation mechanisms within distinct host cells and also provided an elegant paradigm where proteomic profiling of intracellular pathogens is utilized to discriminate specific host environments (e.g., on the basis of nutrient availability). IMPORTANCE Salmonella Typhimurium is one of the leading causes of foodborne bacterial infection. Nevertheless, how Salmonella adapts to distinct types of host cells during infection remains poorly understood. By contrasting intracellular Salmonella proteomes from both infected macrophages and epithelial cells, we found striking proteomic signatures specific to particular types of host cells. Notably, Salmonella proteomic remodeling exhibited quicker kinetics in macrophages than in epithelial cells with respect to bacterial virulence and flagellar and chemotaxis systems. Furthermore, we unveiled high levels of induction of bacterial histidine biosynthesis in macrophages but not in epithelial cells, which is attributable to differing intracellular levels of this amino acid. Intriguingly, we found that a defective hisG gene renders a Salmonella strain hypersensitive to histidine shortage in macrophages. Overall, our work reveals specific Salmonella adaptation mechanisms in distinct host cells, which should aid in the development of novel anti-infection strategies.Zezhou LiYanhua LiuJiaqi FuBuyu ZhangSen ChengMei WuZhen WangJiezhang JiangCheng ChangXiaoyun LiuAmerican Society for MicrobiologyarticleSalmonella proteomebacterial infectionmass spectrometrythe his operonMicrobiologyQR1-502ENmSystems, Vol 4, Iss 2 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Salmonella proteome bacterial infection mass spectrometry the his operon Microbiology QR1-502
spellingShingle	Salmonella proteome bacterial infection mass spectrometry the his operon Microbiology QR1-502 Zezhou Li Yanhua Liu Jiaqi Fu Buyu Zhang Sen Cheng Mei Wu Zhen Wang Jiezhang Jiang Cheng Chang Xiaoyun Liu <italic toggle="yes">Salmonella</italic> Proteomic Profiling during Infection Distinguishes the Intracellular Environment of Host Cells
description	ABSTRACT Essential to bacterial pathogenesis, Salmonella enterica serovar Typhimurium (S. Typhimurium) has evolved the capacity to quickly sense and adapt to specific intracellular environment within distinct host cells. Here we examined S. Typhimurium proteomic remodeling within macrophages, allowing direct comparison with our previous studies in epithelial cells. In addition to many shared features, our data revealed proteomic signatures highly specific to one type of host cells. Notably, intracellular S. Typhimurium differentially regulates the two type III secretion systems (T3SSs) far more quickly in macrophages than in epithelial cells; bacterial flagellar and chemotaxis systems degenerate more quickly in macrophages than in HeLa cells as well. Importantly, our comparative analysis uncovered high levels of induction of bacterial histidine biosynthesis in macrophages but not in epithelial cells. Targeted metabolomic measurements revealed markedly lower histidine levels within macrophages. Intriguingly, further functional studies established that histidine biosynthesis that is defective (due to a hisG mutation) renders the bacterium (strain SL1344) hypersensitive to intracellular shortage of this amino acid. Indeed, another S. Typhimurium strain, namely, strain 14028s, with a fully functional biosynthetic pathway exhibited only minor induction of the his operon within infected macrophages. Our work thus provided novel insights into S. Typhimurium adaptation mechanisms within distinct host cells and also provided an elegant paradigm where proteomic profiling of intracellular pathogens is utilized to discriminate specific host environments (e.g., on the basis of nutrient availability). IMPORTANCE Salmonella Typhimurium is one of the leading causes of foodborne bacterial infection. Nevertheless, how Salmonella adapts to distinct types of host cells during infection remains poorly understood. By contrasting intracellular Salmonella proteomes from both infected macrophages and epithelial cells, we found striking proteomic signatures specific to particular types of host cells. Notably, Salmonella proteomic remodeling exhibited quicker kinetics in macrophages than in epithelial cells with respect to bacterial virulence and flagellar and chemotaxis systems. Furthermore, we unveiled high levels of induction of bacterial histidine biosynthesis in macrophages but not in epithelial cells, which is attributable to differing intracellular levels of this amino acid. Intriguingly, we found that a defective hisG gene renders a Salmonella strain hypersensitive to histidine shortage in macrophages. Overall, our work reveals specific Salmonella adaptation mechanisms in distinct host cells, which should aid in the development of novel anti-infection strategies.
format	article
author	Zezhou Li Yanhua Liu Jiaqi Fu Buyu Zhang Sen Cheng Mei Wu Zhen Wang Jiezhang Jiang Cheng Chang Xiaoyun Liu
author_facet	Zezhou Li Yanhua Liu Jiaqi Fu Buyu Zhang Sen Cheng Mei Wu Zhen Wang Jiezhang Jiang Cheng Chang Xiaoyun Liu
author_sort	Zezhou Li
title	<italic toggle="yes">Salmonella</italic> Proteomic Profiling during Infection Distinguishes the Intracellular Environment of Host Cells
title_short	<italic toggle="yes">Salmonella</italic> Proteomic Profiling during Infection Distinguishes the Intracellular Environment of Host Cells
title_full	<italic toggle="yes">Salmonella</italic> Proteomic Profiling during Infection Distinguishes the Intracellular Environment of Host Cells
title_fullStr	<italic toggle="yes">Salmonella</italic> Proteomic Profiling during Infection Distinguishes the Intracellular Environment of Host Cells
title_full_unstemmed	<italic toggle="yes">Salmonella</italic> Proteomic Profiling during Infection Distinguishes the Intracellular Environment of Host Cells
title_sort	<italic toggle="yes">salmonella</italic> proteomic profiling during infection distinguishes the intracellular environment of host cells
publisher	American Society for Microbiology
publishDate	2019
url	https://doaj.org/article/292aac115f3a4b9e913de22c8233a82a
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<italic toggle="yes">Salmonella</italic> Proteomic Profiling during Infection Distinguishes the Intracellular Environment of Host Cells

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