异形特异性C端酸化驱动了素激酶1的自身抑制
Rachel L Harold1, Nikhil K Tulsian2,3, Rajesh Narasimamurthy4
1Department of Chemistry & Biochemistry, University of California Santa Cruz, Santa Cruz, CA 95064.
bioRxiv : the preprint server for biology
|August 12, 2024
概括
氨酸激酶1 (CK1) 活性是由其C端尾酸化调节的. 特定的尾部区域控制CK1自身抑制,影响昼夜节律和细胞过程.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 时间生物学 时间生物学
背景情况:
- 氨酸激酶1 (CK1) 在昼夜节律和Wnt信号传递中起着至关重要的作用.
- CK1的活动通过其无序的C端尾部的自酸化来调节.
- 两个CK1拼接变体CK1δ和CK1ε,由于它们的极端C-终端 (XCT) 的差异,对昼夜节律产生了不同的影响.
研究的目的:
- 研究CK1δ和CK1ε变体的XCT如何差异调节激酶自身抑制.
- 阐明XCT酸化影响CK1活动和昼夜周期的机制.
主要方法:
- 核磁共振 (NMR) 光谱学 核磁共振 (NMR) 光谱学
- -交换质谱法 (HDX-MS) 是一种交换质谱法.
- 在体外激酶测定试验中.
- 细胞检测试验 细胞检测试验
- 局部导向的突变发生.
主要成果:
- CK1δ的XCT被CK1优先酸化,而CK1ε尾部与激酶域进行更广泛的相互作用.
- 突变 CK1δ 特定的 XCT 酸化位增强了体外和细胞内的激酶活性.
- 失去XCT酸化位点会破坏尾巴激酶域相互作用,减少自身抑制.
- CK1自抑制涉及在活性位点附近保存的离子结合点,表明一种常见的产品抑制机制.
结论:
- CK1 C终端尾部的酸化循环是控制酶活性的关键调节机制.
- 不同的XCT序列和酸化模式有助于CK1拼接变体在生物过程 (如昼夜节律) 中发挥不同的作用.
- 了解CK1调节为涉及昼夜干扰或Wnt信号的疾病的治疗策略提供了洞察力.
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