在Klebsiella pneumoniae细菌微分区的主要外组件之间,有着不规则的结构交叉兼容性
Lucie Barthe1, Damien Balestrino2, Bessam Azizi1,3
1TBI, Université de Toulouse, CNRS, INRAE, INSA, Toulouse, France.
PloS one
|May 7, 2025
概括
细菌微分区 (BMC) 蛋白,BMC-H 六合体,可以形成复杂的异质六合体,而不仅仅是同型寡合体. 这种结构的乱交揭示了BMC外的复杂性比以前理解的要大.
科学领域:
- 微生物学 微生物学
- 结构生物学 结构生物学
- 生物化学 生化学
背景情况:
- 细菌微分区 (BMC) 是基于蛋白质的细胞器,对细菌代谢至关重要.
- BMC-H 六合体形成外,控制透性和可塑性.
- 现有的模型建议BMC-H蛋白质形成同型寡合体,但对应物存在表明异型寡合化.
研究的目的:
- 调查BMC-H对应物的结构性乱交和异质六合体形成.
- 为了确定不同BMC类型的BMC-H对应物是否可以相互作用.
- 根据潜在的异质寡合化,重新评估BMC外的复杂性.
主要方法:
- 在Klebsiella pneumoniae中同时激活多个BMC操作子.
- 在大肠杆菌中使用适应的三方GFP技术对所有BMC-H平行对组合进行查.
- 使用Alphafold和ESMFold进行结构预测,并对异构六体稳定性和组装的生物化学验证.
主要成果:
- 多个BMC-H对应物表现出交叉兼容性,形成异质六合体.
- 同样和不同的BMC类型的paralogs之间发生相互作用.
- 计算预测和生物化学测试证实了选定的异构关联的稳定性.
- 对现有数据的重新分析确定了沙门氏菌Enterica BMCs中的PduA-PduJ异质六合体.
结论:
- BMC-H 蛋白显示出显著的结构杂交,形成异质六合体.
- BMC外的结构复杂性比以前所认为的要高.
- 这些发现需要对BMC外组装和功能进行修订理解.
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