酵母SPT-Orm2复合物的协同调节,通过酸化和胺
Tian Xie1, Feitong Dong1, Gongshe Han2
1Department of Chemical Biology, School of Life Sciences, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China.
Cell reports
|January 29, 2024
概括
酵母血清棕转移酶 (SPT) 的活性由Orm脱和胺结合来调节. 胺稳定了Orm2的抑制构造,而酸化则使其不稳定,揭示了酵母独特的调节机制.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 酵母遗传学 酵母遗传学
背景情况:
- 血清棕转移酶 (SPT) 活性对于脂生物合成至关重要.
- 酵母中SPT的调节涉及Orm蛋白的N-终端酸化,这种酸化在较高的真核生物中不存在.
- 胺反抑制SPT-ORM/ORMDL复合体在较高的真核生物中保持,但其酵母机制尚不清楚.
研究的目的:
- 阐明酵母中Orm2对SPT调节的结构基础.
- 调查酸化和胺在SPT监管中的相互作用.
- 为了确定酵母SPT-Orm2复合体中保存的调节元素.
主要方法:
- 进行X射线晶体学以确定酵母SPT-Orm2复合物的结构.
- 生物化学测试以评估SPT活动对胺和酸化状态的反应.
- 局部定向的突变发生,以产生非相仿和相仿的Orm2变体.
主要成果:
- 确定了酵母SPT-Orm2复合物的结构在一个dephosphomimetic状态.
- 确定了一个进化保存的陶胺感应部位.
- 胺结合稳定了dephosphomimeticOrm2的抑制性构造,通过分子内β片.
- 一种相仿性突变使这种抑制性构造变得不稳定.
结论:
- 欧姆脱化和胺结合都对抑制酵母中的SPT活性至关重要.
- 酵母采用独特的监管机制,包括在SPT上协同酸化和胺的作用.
- 研究结果提供了对细胞中SPT调节的演变的见解.
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