通过铜调节的TonB依赖转运体CrtA进行皮奥辛的外膜转移
Jiraphan Premsuriya1,2, Khedidja Mosbahi1, Iva Atanaskovic3
1School of Infection and Immunity, University of Glasgow, Glasgow G12 8TA, U.K.
The Biochemical journal
|July 3, 2023
概括
鉴定了来自Pseudomonas aeruginosa的两种新型皮奥辛,SX1和SX2. 这些pyocins通过利用独特的铜调节输送器CrtA进入细胞来向多药耐药菌株.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- Pseudomonas aeruginosa 导致严重的医院感染,是囊性纤维化患者死亡的主要原因.
- 在P. aeruginosa中,高抗微生物耐药性需要新的治疗策略.
- 皮奥辛是由P. aeruginosa产生的蛋白质抗生素,对同一种物种表现出狭窄光谱活性.
研究的目的:
- 为了识别和描述来自P. aeruginosa的新型皮奥辛.
- 阐明这些新型皮奥辛的吸收和运输机制.
- 调查调控并确定参与皮奥辛吸收的载体.
主要方法:
- 新型皮奥辛SX1和SX2的分离和表征.
- 对皮奥辛活性的分析 (DNase和蛋白质合成抑制).
- 基因和生物化学方法绘制皮奥辛吸收途径的地图,包括识别一种新的TonB依赖转运体 (TBDT).
主要成果:
- 确定了两种新的S型皮奥辛,SX1 (金属依赖DNase) 和SX2 (蛋白质合成抑制剂).
- 这两种pyocin都使用常见的多糖抗原 (CPA) 和一种新型的TBDT,PA0434 (指定为CrtA),用于外膜穿越.
- B1和FtsH对于皮奥辛激活和内膜转移至关重要.
- CrtA表达是由铜的可用性调节的.
结论:
- 新型素SX1和SX2代表了对抗多药耐药P. aeruginosa的潜在治疗方法.
- 涉及CPA,CrtA,TonB1和FtsH的已确定吸收途径为P. aeruginosa外膜传输提供了新的见解.
- 发现一个不参与铁吸收的TBDT (CrtA) 扩大了已知的细菌运输系统的范围.
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