Modulation of cell wall synthesis and susceptibility to vancomycin by the two-component system AirSR in Staphylococcus aureus NCTC8325.

Modulation of cell wall synthesis and susceptibility to vancomycin by the two-component system AirSR in Staphylococcus aureus NCTC8325.
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双组分系统 AirSR 对金黄色葡萄球菌 NCTC8325 细胞壁合成和万古霉素敏感性的调节

DOI:
10.1186/1471-2180-13-286
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发表时间:
2013-12-10
期刊:
影响因子:
4.2
通讯作者:
Sun B
Sun B
中科院分区:
生物学3区
文献类型:
--
作者:
Sun H;Yang Y;Xue T;Sun B

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自从耐甲氧西林金黄色葡萄球菌(MRSA)的患病率增加以来,万古霉素一直是治疗金黄色葡萄球菌感染的最后手段。一些菌株已经产生了对万古霉素的中度耐药性,这通常与两组分系统(TCS)某些部分(如GraSR、VraSR和WalKR)的表达改变或突变有关。 我们删除了金黄色葡萄球菌NCTC8325中的AirSR两组分系统,并使用微阵列分析将所得转录水平与其亲本菌株进行比较。结果表明,在airSR突变体中,20多个与细胞壁代谢相关的基因被下调。在万古霉素存在的情况下,airSR突变体表现出降低的自溶率和生存能力。实时逆转录PCR和DNA迁移率变动分析证实,AirR能够直接结合并调控在细胞壁代谢(cap、pbp1和ddl)和自溶(lytM)中起作用的基因。 在金黄色葡萄球菌NCTC8325中,AirSR在细胞壁生物合成和周转中起正调控作用。
Vancomycin has been the medication of last resort to cure infections caused by Staphylococcus aureus since the increase in the prevalence of methicillin-resistant Staphylococcus aureus (MRSA). Some strains have developed vancomycin-intermediate resistance, which is generally associated with altered expression of or mutations in some part of the two-component system (TCS), such as GraSR, VraSR, and WalKR. We deleted the AirSR TCS in S. aureus NCTC8325 and compared the resultant transcript levels with those of its parent strain using microarray analysis. The results indicated that more than 20 genes that are related to cell wall metabolism were down-regulated in the airSR mutant. The airSR mutant exhibited reduced autolysis rates and reduced viability in the presence of vancomycin. Real-time reverse transcription PCR and DNA mobility shift assays verified that AirR can directly bind to and regulate genes that function in cell wall metabolism (cap, pbp1, and ddl) and autolysis (lytM). AirSR acts as a positive regulator in cell wall biosynthesis and turnover in Staphylococcus aureus NCTC8325.
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