在Proteus mirabilis中识别调节赫西丁和八丁丁敏感性的机制
Harriet Pelling1,2, Vicky Bennett1, Lucy J Bock3
1Department of Life Sciences, University of Bath, Bath BA2 7AY, United Kingdom.
Journal of applied microbiology
|July 11, 2024
概括
鉴定了Proteus mirabilis对赫西丁 (CHD) 和丁丁 (OCT) 耐受性的机制. 禁用smvR抑制剂是耐受两种生物制剂的关键,而mipA突变提供了适度的CHD保护.
科学领域:
- 微生物学 微生物学
- 抗微生物耐药性 抗微生物耐药性
- 生物杀伤剂耐受性 生物杀伤剂耐受性
背景情况:
- 奇迹性蛋白质是导管相关的尿路感染 (CAUTIs) 的常见原因.
- 临床生物制剂,如赫西丁 (CHD) 和丁丁 (OCT),用于预防和治疗CAUTIs.
- 了解P. mirabilis中生物杀毒剂耐受性机制对于有效的感染控制至关重要.
研究的目的:
- 阐明Proteus mirabilis对赫西丁 (CHD) 和丁丁 (OCT) 的耐受性背后的遗传和分子机制.
- 研究特定基因和突变在赋予对这些广泛使用的生物杀菌剂耐药性的作用.
主要方法:
- 三个临床P.奇迹菌分离物适应CHD和OCT度的增加.
- 基因表征,包括测序,以识别突变.
- 补充研究以确认已识别的突变的作用.
- 适应后的晶体生物膜形成的评估.
主要成果:
- 适应导致了对CHD (512μg/ml) 和OCT (128μg/ml) 的高水平耐受性.
- 不活性化smvR抑制剂和增加smvA流出的突变与对两种生物制剂的耐受性有关.
- 在CHD适应菌株中发现了 mipA 突变,从而赋予了中等程度的保护.
- rppA的突变与降低的多素B敏感性有关,但与CHD或OCT耐受性无直接关系.
结论:
- SmvR无活化是P.奇迹菌对CHD和OCT的耐受性的主要机制.
- 无MipA无活化提供了对心血管疾病的适度保护.
- 该rppA响应调节器在CHD或OCT易感性中没有直接作用.
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