对GDP的整体调节的结构性见解:一种符合形态的动态基酶
bioRxiv : the preprint server for biology
|July 9, 2025
概括
二酶GdpP调节细菌中的抗生素耐药性. 新的结构揭示了它的四重体结构和基质诱导的构造变化,为药物设计提供了针对Firmicutes病原体的点.
科学领域:
- 结构生物学 结构生物学
- 微生物学 微生物学
- 生物化学 生物化学
背景情况:
- 固酶GdpP对于调节细菌的第二信使循环二-AMP (c-di-AMP) 是至关重要的,并且与致病性Firmicutes中的抗生素耐药性有关.
- GdpP通过其PAS域集成环境信号来调节其催化活性,但由于结构数据有限,人们对这种全调节的机制知之甚少.
研究的目的:
- 阐明Streptococcus mutans GdpP (SmGdpP74) 细胞溶解区域中的全性通信和催化调节的分子基础.
- 为SmGdpP74.7的四度结构和构造状态提供高分辨率的结构洞察力.
主要方法:
- 电子显微镜 (Cryo-EM) 用于确定 SmGdpP74 在多个构造状态中的结构.
- 生物化学和功能分析,以调查基质诱导的形状转变和调节机制.
主要成果:
- SmGdpP74的第一个冷电磁结构揭示了一个四度结构,使得不对称的催化调节.
- 基质结合会诱导形状变化,DHHA1域界面是不对称催化剂的关键.
- 一个非正规的GGDEF域作为DHH-DHHA1催化域的支架,一个灵活的GGDEF-DHH链接器传输信号,对活动至关重要.
- 链接器内部的KRSR动机作为一种分子开关,用于血液介导的抑制.
结论:
- 提出了SmGdpP74活动的机制模型,集成基质可用性,构造变化和PAS域介导的全控制.
- 对GdpP的全调节的结构洞察力为开发新药的基础,以打击致病性Firmicutes中的抗生素耐药性.
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