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High sodium chloride concentrations inhibit staphylococcal enterotoxin C gene (sec) expression at the level of sec mRNA.

机译:高浓度的氯化钠会在sec mRNA水平上抑制葡萄球菌肠毒素C基因(sec)的表达。

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Expression of the staphylococcal enterotoxin type C gene (sec) is regulated in response to both high NaCl concentrations (osmolarity) and the accessory gene regulator (agr). agr is a global regulator that alters the expression of many genes in Staphylococcus aureus. In this report, we have demonstrated that osmoregulation of sec occurs at the level of mRNA independently of an intact agr allele. Northern (RNA) and Western blot (immunoblot) analyses of samples from cultures grown in low- (0 M NaCl) and high-osmotic-strength (1.2 M NaCl) media revealed that the low-osmotic-strength culture contained approximately 16-fold more SEC and sec mRNA than the high-osmotic-strength culture. sec expression in high-osmotic-strength medium was enhanced when osmoprotective compounds were added. Osmoregulation of sec expression in Agr- strains was also examined; SEC and sec mRNA levels decreased in response to high osmolarity in a manner similar to that seen in the Agr+ strains.
机译:响应高NaCl浓度(摩尔渗透压浓度)和辅助基因调节剂(agr),调节葡萄球菌肠毒素C型基因的表达(sec)。 agr是一种全球调节剂,可改变金黄色葡萄球菌中许多基因的表达。在此报告中,我们证明了sec的渗透调节发生在mRNA水平上,而与完整的农业等位基因无关。在低(0 M NaCl)和高渗透强度(1.2 M NaCl)培养基中培养的培养物样品的Northern(RNA)和Western blot(免疫印迹)分析显示,低渗透强度培养物的含量约为16倍与高渗透力培养相比,SEC和sec mRNA含量更高。加入渗透保护性化合物后,sec在高渗透强度培养基中的表达增强。还检查了农业菌株中sec表达的渗透调节。 SEC和sec mRNA水平响应高渗透压而下降,其方式类似于Agr +菌株。

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