Heterogeneity in ess transcriptional organization and variable contribution of the Ess/Type VII protein secretion system to virulence across closely related Staphylocccus aureus strains.

Heterogeneity in ess transcriptional organization and variable contribution of the Ess/Type VII protein secretion system to virulence across closely related Staphylocccus aureus strains.
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DOI:
10.1111/mmi.12707
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发表时间:
2014-09
影响因子:
3.6
通讯作者:
Palmer T
Palmer T
中科院分区:
生物学2区
文献类型:
--
作者:
Kneuper H;Cao ZP;Twomey KB;Zoltner M;Jäger F;Cargill JS;Chalmers J;van der Kooi-Pol MM;van Dijl JM;Ryan RP;Hunter WN;Palmer T

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在革兰氏阳性细菌中发现的VII型蛋白分泌系统向生长介质分泌含有保守的W-x-G氨基酸序列基序的小蛋白。金黄色葡萄球菌有一种保守的III型分泌系统,称为Ess,对实验室生长是必不可少的,但对毒力是必需的。在这项研究中,我们发现,在紧密相关的金黄色葡萄球菌菌株之间,ESS基因簇的组织结构存在意想不到的差异。我们进一步证明,在实验室的生长介质中,不同的金黄色葡萄球菌菌株在不同的生长点分泌EsxA和EsxC底物蛋白,而Newman菌株的Ess系统在这些条件下是不活跃的。金黄色葡萄球菌 RN6390的系统缺失分析与该菌株分泌机制的核心成分esaA、esaB、essa、essB、essc和esxA蛋白一致。最后,我们证明了两个金黄色葡萄球菌株RN6390和Col的Ess分泌机制对于小鼠肺炎模型的鼻腔定植和毒力是重要的。然而,令人惊讶的是,在相同的条件下,分泌系统对菌株SA113的毒力没有作用。
The Type VII protein secretion system, found in Gram-positive bacteria, secretes small proteins, containing a conserved W-x-G amino acid sequence motif, to the growth medium. Staphylococcus aureus has a conserved Type VII secretion system, termed Ess, which is dispensable for laboratory growth but required for virulence. In this study we show that there are unexpected differences in the organization of the ess gene cluster between closely related strains of S. aureus. We further show that in laboratory growth medium different strains of S. aureus secrete the EsxA and EsxC substrate proteins at different growth points, and that the Ess system in strain Newman is inactive under these conditions. Systematic deletion analysis in S. aureus RN6390 is consistent with the EsaA, EsaB, EssA, EssB, EssC and EsxA proteins comprising core components of the secretion machinery in this strain. Finally we demonstrate that the Ess secretion machinery of two S. aureus strains, RN6390 and COL, is important for nasal colonization and virulence in the murine lung pneumonia model. Surprisingly, however, the secretion system plays no role in the virulence of strain SA113 under the same conditions.
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