The group A Streptococcus small regulatory RNA FasX enhances streptokinase activity by increasing the stability of the ska mRNA transcript.

The group A Streptococcus small regulatory RNA FasX enhances streptokinase activity by increasing the stability of the ska mRNA transcript.
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DOI:
10.1111/j.1365-2958.2010.07427.x
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发表时间:
2010-12
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:
Ramirez-Peña E;Treviño J;Liu Z;Perez N;Sumby P

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小RNA分子在许多细菌物种中起着关键的调节作用。然而,很少有机制的数据存在的作用,小调控RNA(sRNA)在人类病原体A组链球菌(GAS)。在这里,我们分析了一个假定的气体sRNA和生产的分泌的毒力因子链激酶(SKA)之间的关系。SKA通过激活宿主纤溶酶原转化为纤维蛋白降解蛋白酶纤溶酶来促进GAS传播。同源物的推定的sRNA编码基因纤连蛋白/纤维蛋白原结合/溶血活性/链激酶调节因子-X(fasX),确定在四个不同的化脓性链球菌物种。然而,尽管有79%的fasX核苷酸的同一性,fasX等位基因的动物病原体动物链球菌未能补充GAS fasX突变体。使用一系列精确构建的fasX等位基因,我们发现FasX是一种真正的sRNA,在GAS中转录后调节SKA的产生。通过与ska mRNA的5'端碱基配对,FasX增强ska转录物的稳定性,导致SKA活性增加约10倍。我们的数据为sRNAs激活靶mRNA的机制提供了新的见解,并增强了我们对关键GAS毒力因子调控的理解。
Small RNA molecules play key regulatory roles in many bacterial species. However, little mechanistic data exists for the action of small regulatory RNAs (sRNAs) in the human pathogen group A Streptococcus (GAS). Here, we analyzed the relationship between a putative GAS sRNA and production of the secreted virulence factor streptokinase (SKA). SKA promotes GAS dissemination by activating conversion of host plasminogen into the fibrin-degrading protease plasmin. Homologues of the putative sRNA-encoding gene fibronectin/fibrinogen-binding/hemolytic-activity/streptokinase-regulator-X (fasX) were identified in four different pyogenic streptococcal species. However, despite 79% fasX nucleotide identity, a fasX allele from the animal pathogen Streptococcus zooepidemicus failed to complement a GAS fasX mutant. Using a series of precisely-constructed fasX alleles we discovered that FasX is a bona-fide sRNA that post-transcriptionally regulates SKA production in GAS. By base-pairing to the 5’ end of ska mRNA, FasX enhances ska transcript stability, resulting in a ~10-fold increase in SKA activity. Our data provide new insights into the mechanisms used by sRNAs to activate target mRNAs, and enhances our understanding of the regulation of a key GAS virulence factor.
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