Dynamics of speB mRNA transcripts in streptococcus pyogenes

Zhiyun Chen, Andreas Itzek, Horst Malke, Joseph J. Ferretti, Jens Kreth

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

Streptococcus pyogenes (group A streptococcus [GAS]) is a human-specific pathogen that causes a variety of diseases ranging from superficial infections to life-threatening diseases. SpeB, a potent extracellular cysteine proteinase, plays an important role in the pathogenesis of GAS infections. Previous studies show that SpeB expression and activity are controlled at the transcriptional and posttranslational levels, though it had been unclear whether speB was also regulated at the posttranscriptional level. In this study, we examined the growth phase-dependent speB mRNA level and decay using quantitative reverse transcription-PCR (qRT-PCR) and Northern blot analyses. We observed that speB mRNA accumulated rapidly during exponential growth, which occurred concomitantly with an increase in speB mRNA stability. A closer observation revealed that the increased speB mRNA stability was mainly due to progressive acidification. Inactivation of RNase Y, a recently identified endoribonuclease, revealed a role in processing and degradation of speB mRNA. We conclude that the increased speB mRNA stability contributes to the rapid accumulation of speB transcript during growth.

Original languageEnglish (US)
Pages (from-to)1417-1426
Number of pages10
JournalJournal of bacteriology
Volume194
Issue number6
DOIs
StatePublished - Mar 2012

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology

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