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Pheromone-induced expression of recombinant proteins in Streptococcus thermophilus

机译:信息素诱导的嗜热链球菌重组蛋白表达

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摘要

A locus encoding proteins with high homology to the pneumococcal BlpABCHR quorum-sensing system was identified in Streptococcus thermophilus LMG 18311. The BlpABCHR system regulates bacteriocin production in Streptococcus pneumoniae by monitoring the extracellular concentration of a peptide-pheromone encoded by blpC. The homologous system in S. thermophilus, termed StbABCHR, contains a corresponding gene (stbC) encoding a possible peptide-pheromone (STP) that presumably controls bacteriocin production in S. thermophilus. We synthesized this peptide and found that it activates transcription of a gusA reporter gene placed behind the promoter of the bacteriocin-like gene stbD. Furthermore, deletion mapping and mutational analysis of the stbD promoter region were used to identify a degenerated direct repeat motif required for STP induced GusA expression. Our findings provide strong evidence that STP regulates bacteriocin production in S. thermophilus LMG 18311, and show that the StbABCHR quorum-sensing system can be exploited for inducible expression of recombinant proteins in this bacterial species.
机译:在嗜热链球菌LMG 18311中鉴定到一个编码与肺炎球菌BlpABCHR群体感应系统高度同源的蛋白质的基因座。BlpABCHR系统通过监测blpC编码的肽-信息素的细胞外浓度来调节肺炎链球菌中细菌素的产生。嗜热链球菌的同源系统称为StbABCHR,包含一个相应的基因(stbC),该基因编码一种可能控制嗜热链球菌中细菌素产生的肽-信息素(STP)。我们合成了这种肽,发现它可以激活位于细菌素样基因stbD启动子后面的gusA报告基因的转录。此外,stbD启动子区域的缺失作图和突变分析被用来识别STP诱导的GusA表达所需的简并的直接重复基序。我们的发现提供了有力的证据,表明STP调节嗜热链球菌LMG 18311中细菌素的产生,并表明StbABCHR群体感应系统可用于在该细菌物种中诱导重组蛋白的表达。

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