鉴定一种具有G蛋白仿真功能的细菌III型效应器家族
Neal M Alto1, Feng Shao, Cheri S Lazar
1Department of Pharmacology, Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA 92093, USA.
细菌病原体注入效应蛋白,模仿宿主细胞信号GTPase,如RhoA,Rac1和Cdc42. 这些对感染至关重要的功能模仿者,使用保存的WxxxE动机进行活动.
科学领域:
- 微生物学 微生物学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 细菌病原体利用III型分泌系统 (T3SS) 将效应蛋白送入宿主细胞.
- 这些效应器操纵宿主细胞功能,促进感染和疾病的进展.
研究的目的:
- 为了识别和表征一种新的细菌效应蛋白家族.
- 阐明这些效应器颠覆宿主细胞信号通路的机制.
主要方法:
- 生物信息分析用于识别各种细菌病原体中的效应蛋白家族.
- 功能测试以确定受影响器准的宿主细胞信号通路.
- 位点定向突变发生,以调查特定基因 (如WxxxE) 在效应器活性中的作用.
主要成果:
- 在沙门氏菌,西格拉菌和肠病原性大肠杆菌中保存的24个成员的效应蛋白家族的识别.
- 证明效应器IpgB2,IpgB1和Map在功能上分别模仿了与GTP结合的RhoA,Rac1和Cdc42.
- 证据表明这些效应因子是功能性的,而不是结构性的,模仿,缺乏关氨酸核酸结合和正规的GTPase域.
- 发现了能赋予信号特异性的细胞内向序列.
- 发现保存的WxxxE基因对IpgB2,IpgB1和Map的活性至关重要.
结论:
- 细菌效应体可以在没有结构同质性的情况下功能性地模仿宿主GTPases.
- WxxxE图案代表了这个效应器家族中保存的功能元素,表明一个共同的分子机制.
- 这些发现提供了细菌病原体和宿主病原体相互作用的见解,突出了治疗干预的新目标.
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