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A gene unique to Streptococcus pyogenes, called vfr, that negatively regulates speB, an important extracellular proteinase, has been identified. Disruption of vfr markedly increased SpeB production in a clinical strain of S. pyogenes and relieved its growth phase dependency. These findings may provide important insights into the pathogenesis of invasive S. pyogenes infections.

vfr , a Novel Locus Affecting Cysteine Protease Production in Streptococcus pyogenes