在β-1,3-葡萄糖合成酶FKS1-Rho1复合物的冷-EM结构
Jialu Li1, Huayi Liu2,3, Jian Li2,3
1Department of Obstetrics, Key Laboratory of Birth Defects and Related Disease of Women and Children of MOE, State Key Laboratory of Biotherapy, West China Second Hospital, Sichuan University, Chengdu, China.
Nature communications
|February 28, 2025
概括
这项研究揭示了Rho1如何使用冷EM结构激活真菌β-1,3-葡萄糖合成酶 (GS). 一个Rho1一个Rho1
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 菌类学 菌类学是指菌类学.
背景情况:
- β-1,3-葡萄糖合成酶 (GS) 对于真菌细胞壁的完整性至关重要.
- 这种GS全酶由FKS1和调节性GTPase Rho1.1组成.
- 通过Rho1介导的FKS1激活的精确机制仍然难以捉摸.
研究的目的:
- 为了阐明Rho1-介导的β-1,3-葡萄糖合成酶的激活的结构基础.
- 了解GTP依赖相互作用在真菌细胞壁生物合成中的作用.
主要方法:
- 电子显微镜 (cryo-EM) 用于确定FKS1.1的结构.
- 在Apo和Rho1结合状态下对FKS1的结构分析,包括与GTPγS.
- 对形状变化的比较分析.
主要成果:
- 确定了FKS1 (apo和Rho1-bound) 的两个冷EM结构.
- FKS1表现出一种类似纤维素合成酶的折叠.
- 在FKS1的GT域和跨膜螺旋之间,Rho1结合在一个口袋中,在GTPγS的存在下,相互作用增强.
- 在Rho1结合时观察到广泛的FKS1构造变化.
结论:
- 罗1的GTP/GDP循环可能充当分子,驱动FKS1的激活.
- 结合Rho1诱导了形状变化,这可能有助于FKS1的跨膜通道内的葡萄糖链延长.
- 这种机制为真菌细胞壁生物合成和潜在的抗真菌标提供了洞察力.
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