RNA chaperone activates Salmonella virulence program during infection.

RNA chaperone activates Salmonella virulence program during infection.
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DOI:
10.1093/nar/gkab992
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发表时间:
2021-11-18
影响因子:
14.9
通讯作者:
Groisman EA
Groisman EA
中科院分区:
生物学2区
文献类型:
--
作者:
Choi J;Salvail H;Groisman EA

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生物体通常含有看似多余的蛋白质。在鼠伤寒沙门氏菌中,RNA伴侣CSPC和CSPE似乎扮演着多余的毒力角色,因为缺乏这两个伴侣的突变株会减弱,而缺乏一个的突变株表现出野生型的毒力。我们现在报道,当鼠伤寒沙门氏菌经历温和的酸性pH时,如巨噬细胞内,激活主要毒力调节因子Phop所必需的是CSPC,而不是CSPE。这种依赖于CSPC的Phop激活是温和酸性pH所特有的,因为CSPC突变株在其他Phop激活条件下的行为类似于野生型鼠伤寒沙门氏菌。此外,它是由UgtL介导的,UgtL是巨噬细胞内激活Phop所必需的毒力基因。纯化的CSPC通过破坏ugtL mRNA中封闭ugtL核糖体结合位点的二级结构来促进ugtL翻译。我们的发现表明,看似多余的蛋白质实际上赋予了有机体生活方式独特而关键的功能。RNA伴侣CSPC通过破坏ugtL基因的二级结构,促进毒力基因ugtL的翻译,从而推进由Phop/PhoQ指导的沙门氏菌在巨噬细胞吞噬体内的毒力程序。
Organisms often harbor seemingly redundant proteins. In the bacterium Salmonella enterica serovar Typhimurium (S. Typhimurium), the RNA chaperones CspC and CspE appear to play redundant virulence roles because a mutant lacking both chaperones is attenuated, whereas mutants lacking only one exhibit wild-type virulence. We now report that CspC—but not CspE—is necessary to activate the master virulence regulator PhoP when S. Typhimurium experiences mildly acidic pH, such as inside macrophages. This CspC-dependent PhoP activation is specific to mildly acidic pH because a cspC mutant behaves like wild-type S. Typhimurium under other PhoP-activating conditions. Moreover, it is mediated by ugtL, a virulence gene required for PhoP activation inside macrophages. Purified CspC promotes ugtL translation by disrupting a secondary structure in the ugtL mRNA that occludes ugtL’s ribosome binding site. Our findings demonstrate that proteins that are seemingly redundant actually confer distinct and critical functions to the lifestyle of an organism. RNA chaperone CspC promotes translation of virulence gene ugtL by disrupting secondary structure in ugtL mRNA leader, thereby advancing Salmonella virulence program directed by PhoP/PhoQ inside a macrophage phagosome.
DOI: 10.1006/jmbi.2000.3848
发表时间: 2000-07-07
影响因子: 5.6
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细菌细胞质中的酸性pH传感是沙门氏菌毒力所必需的。
DOI: 10.1111/mmi.13439
发表时间: 2016-09
影响因子: 3.6
作者:
Choi J;Groisman EA
通讯作者: Groisman EA
DOI: 10.1073/pnas.120163297
发表时间: 2000-06-06
影响因子: 11.1
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