通过转激素的快速进化,逃脱细菌的铁盗版
Matthew F Barber1, Nels C Elde2
1Department of Human Genetics, University of Utah School of Medicine, Salt Lake City, UT 84112, USA.
概括
营养免疫驱动宿主-病原体的进化. 在转移中转移.
科学领域:
- 进化生物学是进化的生物学.
- 免疫学 免疫学 免疫学
- 微生物的病原发生.
背景情况:
- 铁封存或营养免疫是一种宿主防御机制.
- 病原体从宿主中掠夺铁,为这种必不可少的营养素发起了一场战斗.
- 这场铁战在宿主-病原体界面上的进化影响在很大程度上是未知的.
研究的目的:
- 研究营养免疫在宿主-病原体相互作用中的进化作用.
- 探索宿主铁运输蛋白转和细菌铁获取系统之间的进化冲突.
主要方法:
- 在灵长类动物中对转移素进化的比较分析.
- 研究转激素与细菌TbpA (转激素结合蛋白A) 之间的结合相互作用.
- 检查人类转移素C2多态性与Hemophilus influenzae TbpA变体的关系.
主要成果:
- 转基因在与细菌TbpA相互作用的部位表现出快速的进化,这表明了进化军备竞赛.
- 特定的转基因替代物可以破坏TbpA的结合,从而抵消子中的细菌铁盗版.
- 人类C2转移素变体有效地逃避了Haemophilus influenzae的TbpA,解释了持续的遗传变异.
结论:
- 营养免疫,特别是铁战,是灵长类动物和细菌病原体之间持续的进化冲突的重要驱动因素.
- 主体-病原体的共同进化是由铁运输和获取系统中的分子适应形成的.
- 了解这些冲突可以了解宿主防御和病原体适应.
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