CK1 C-终端的基质位移调节了激酶特异性
Sierra N Cullati1, Kazutoshi Akizuki1, Jun-Song Chen1
1Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN, USA.
bioRxiv : the preprint server for biology
|July 10, 2023
概括
氨酸激酶1 (CK1) 自体酸化的C端尾部抑制了酶的活性. 这项研究揭示了尾部酸化如何通过排位模型调节CK1基质特异性.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 酶学 是一种酶学.
背景情况:
- 氨酸激酶1 (CK1) 酶是许多细胞信号通路的关键调节者.
- 由于它们的广泛生物作用,了解CK1调节至关重要.
- CK1s具有C端非催化尾巴,经过自酸化.
研究的目的:
- 研究C-端尾自化对CK1活性和基质特异性的调节作用.
- 在 * Schizosaccharomyces pombe * Hhp1 和人类 CK1ε 上确定特定的自化位.
- 阐明自化影响CK1基质向的机制.
主要方法:
- 在Hhp1和CK1ε.上对自酸化位点的全面识别.
- 合成和酸化的C端.
- 在体外激酶测试测量基质酸化.
- 对酸激酶域相互作用的分析.
- 位点定向的突变发生来消去酸化位点.
主要成果:
- 化C端酸与CK1激酶域结合,这表明它具有抑制性的伪基质作用.
- 防止尾部自酸化的突变显著增加了Hhp1和CK1ε活动.
- 发现基质可以竞争性地抑制自化尾巴的结合.
- 尾部自化状态调节了CK1对不同基质的催化效率,影响了基质特异性.
结论:
- CK1 C端尾自化作为一个调节机制,调节酶活性和基质特异性.
- 提出了一个位移特异性模型,将尾部自化和催化域化 (例如,T220) 整合在一起,以解释基质向.
- 这种机制可以了解CK1信号通路的微调.
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