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
中科院分区:
文献类型:
--
作者:
Ramirez-Peña E;Treviño J;Liu Z;Perez N;Sumby P
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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DOI:
10.1073/pnas.0803815105
发表时间:
2008-10-28
影响因子:
11.1
作者:
Gryllos, Ioannis;Tran-Winkler, Hien J.;Wessels, Michael R.
通讯作者:
Wessels, Michael R.
影响因子:
14.9
作者:
Afonyushkin, T;Vecerek, B;Moll, I;Bläsi, U;Kaberdin, VR
通讯作者:
Kaberdin, VR
影响因子:
3.7
作者:
Beres SB;Sesso R;Pinto SW;Hoe NP;Porcella SF;Deleo FR;Musser JM
通讯作者:
Musser JM
影响因子:
14.9
作者:
Geissmann T;Chevalier C;Cros MJ;Boisset S;Fechter P;Noirot C;Schrenzel J;François P;Vandenesch F;Gaspin C;Romby P
通讯作者:
Romby P
影响因子:
3.6
作者:
Bugrysheva, Julia V.;Scott, June R.
通讯作者:
Scott, June R.