The small regulatory RNA FasX enhances group A Streptococcus virulence and inhibits pilus expression via serotype-specific targets.

The small regulatory RNA FasX enhances group A Streptococcus virulence and inhibits pilus expression via serotype-specific targets.
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DOI:
10.1111/mmi.12935
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发表时间:
2015-04
影响因子:
3.6
通讯作者:
Sumby P
Sumby P
中科院分区:
生物学2区
文献类型:
--
作者:
Danger JL;Cao TN;Cao TH;Sarkar P;Treviño J;Pflughoeft KJ;Sumby P

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细菌病原体通常在毒力因子表达中显示出种内变异,并且这通常与致病潜力相关。A组链球菌(GAS)产生小的调节RNA(sRNA),FasX,其调节皮利和血栓溶解剂链激酶的表达。由于GAS血清型在以下方面具有多态性:(a)FasX丰度,(B)基因组的纤连蛋白、胶原、T抗原(FCT)区域,其中包含菌毛基因(9种不同的FCT类型),以及(c)链激酶编码基因(ska)序列(2种不同的等位基因),我们试图测试FasX是否以菌毛型特异性方式调节菌毛和链激酶表达。比较了血清型M1(ska-2,FCT-2)、M2(ska-1,FCT-6)、M6(ska-2,FCT-1)和M28(ska-1,FCT-4)分离株的亲本、fasX突变体和互补衍生物。虽然FasX降低了每种血清型中菌毛的表达,但分子基础不同,因为FasX结合并抑制不同FCT区域mRNA的翻译。FasX增强链激酶在每种血清型中的表达,尽管调节的程度不同。最后,我们建立了由FasX提供的调节增强GAS毒力,通过使用表达人纤溶酶原的小鼠的菌血症模型进行评估。我们的数据是第一个确定和表征GAS中sRNA的特定型调控,并显示sRNA直接有助于GAS毒力。
Bacterial pathogens commonly show intra-species variation in virulence factor expression and often this correlates with pathogenic potential. The group A Streptococcus (GAS) produces a small regulatory RNA (sRNA), FasX, which regulates the expression of pili and the thrombolytic agent streptokinase. As GAS serotypes are polymorphic regarding (a) FasX abundance, (b) the fibronectin, collagen, T-antigen (FCT) region of the genome, which contains the pilus genes (nine different FCT-types), and (c) the streptokinase-encoding gene (ska) sequence (two different alleles), we sought to test whether FasX regulates pilus and streptokinase expression in a serotype-specific manner. Parental, fasX mutant, and complemented derivatives of serotype M1 (ska-2, FCT-2), M2 (ska-1, FCT-6), M6 (ska-2, FCT-1), and M28 (ska-1, FCT-4) isolates were compared. While FasX reduced pilus expression in each serotype, the molecular basis differed, as FasX bound, and inhibited the translation of, different FCT-region mRNAs. FasX enhanced streptokinase expression in each serotype, although the degree of regulation varied. Finally, we established that the regulation afforded by FasX enhances GAS virulence, assessed by a model of bacteremia using human plasminogen-expressing mice. Our data are the first to identify and characterize serotype-specific regulation by an sRNA in GAS, and to show an sRNA directly contributes to GAS virulence.
M1T1 A 组链球菌菌毛促进上皮定植,但通过中性粒细胞胞外截留降低全身毒力。
DOI: 10.1007/s00109-009-0566-9
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发表时间: 2007-08-29
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DOI: 10.1111/mmi.12037
发表时间: 2012-12-01
影响因子: 3.6
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通讯作者: McArthur, Jason D.
DOI: 10.1007/978-0-387-73960-1_3
发表时间: 2008-01-01
期刊: HOT TOPICS IN INFECTION AND IMMUNITY IN CHILDREN IV
影响因子: --
作者:
Cunningham, Madeleine W.
通讯作者: Cunningham, Madeleine W.