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
中科院分区:
文献类型:
--
作者:
Danger JL;Cao TN;Cao TH;Sarkar P;Treviño J;Pflughoeft KJ;Sumby P
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.
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影响因子:
4.7
作者:
Alexander, Laura E. Crotty;Maisey, Heather C.;Timmer, Anjuli M.;Rooijakkers, Suzan H. M.;Gallo, Richard L.;von Koeckritz-Blickwede, Maren;Nizet, Victor
通讯作者:
Nizet, Victor
影响因子:
3.7
作者:
Beres SB;Musser JM
通讯作者:
Musser JM
影响因子:
3.6
作者:
Manetti, Andrea G. O.;Zingaretti, Chiara;Margarit, Immaculada
通讯作者:
Margarit, Immaculada
影响因子:
3.6
作者:
Cook, Simon M.;Skora, Amanda;McArthur, Jason D.
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.