多域O-GlcNA病例结构揭示了全性调节机制.
Sara Basse Hansen1, Sergio G Bartual1, Huijie Yuan1,2
1Section for Neurobiology and DANDRITE, Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark.
Nature communications
|October 3, 2025
概括
O-GlcNAc化酶 (OGA) 伪素乙转移酶 (pHAT) 域形成二元并影响酶活性. 这个 pHAT 域是 pHAT 域.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 核细胞质蛋白O-GlcNAcylation是由O-GlcNAc转移酶 (OGT) 和O-GlcNAc酶 (OGA) 调节的.
- O-GlcNAc 酶 (OGA) 酶具有伪素乙转移酶 (pHAT) 域,其结构和功能在很大程度上是未知的.
- 了解OGA监管对于阐明O-GlcNAc平衡至关重要.
研究的目的:
- 确定O-GlcNAc化酶 (OGA) 伪素乙转移酶 (pHAT) 域的结构和功能.
- 研究pHAT域在OGA多域结构和活性中的作用.
- 为了揭示控制O-GlcNAc稳态的全性机制.
主要方法:
- 进行X射线晶体学以确定Trichoplax adhaerens pHAT域的结构.
- 低温电子显微镜 (cryo-EM) 用于解析多域T. adhaerens和人类OGA的结构.
- 生物物理分析以描述OGA域相互作用和形状灵活性.
主要成果:
- 细胞OGA pHAT域形成了具有假定结位的催化无能,对称的同位体.
- 在溶液中,OGA存在于灵活的多域二元体中,链接器相互作用限制了pHAT域的运动.
- 在人体OGA中,pHAT域的移动会诱导灵活臂的形状变化,重塑活性部位的环境.
结论:
- 在调节O-GlcNAc酶活性方面,OGA pHAT域通过全性机制发挥着至关重要的作用.
- 对PHAT域及其相互作用的结构洞察力为了解O-GlcNAc平衡提供了基础.
- 这些发现揭示了影响O-GlcNAc修饰动态的新型调节途径.
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