SKP1-SKP2-CKS1的冷EM结构与CDK2-环素A-p27KIP1复合在一起
Rhianna J Rowland1, Richard Heath1, Daniel Maskell2
1Translational and Clinical Research Institute, Newcastle University Centre for Cancer, Newcastle University, Paul O'Gorman Building, Framlington Place, Newcastle Upon Tyne, NE2 4HH, UK.
Scientific reports
|July 3, 2023
概括
CDK2-环素A-CKS1-p27-SKP1-SKP2复合体的结构揭示了p27的动态性质和CKS1中的新型链运动,解释了其由SCFSKP2E3无处不在酶复合体的调节.
科学领域:
- 结构生物学 结构生物学
- 分子生物学分子生物学
- 生物化学 生化学
背景情况:
- p27KIP1 (循环素依赖性激酶抑制剂1B,p27) 调节细胞循环中的CDKs.
- 通过p27的酸化,它通过SCFSKP2E3泛素合酶复合体来向蛋白质体降解.
研究的目的:
- 为了确定米CDK2-环素A-CKS1-p27-SKP1-SKP2复合物的冷-EM结构.
- 研究p27与SCFSKP2复合体结合的结构动态和调控机制.
主要方法:
- 低温电子显微镜 (cryo-EM) 在3.4 Å分辨率.
- 3D可变性分析,以探索形状灵活性.
- 微粒减去和局部精细化以提高分辨率.
主要成果:
- 通过实验确定了CDK2-cyclin A-CKS1-p27-SKP1-SKP2复合物的结构.
- 证实了p27的结构动态,在结合时从无序结构过渡到二次结构.
- 发现了一种新的CKS1中心的链运动,导致开放和关闭的复杂形状.
结论:
- 鉴定到的形状灵活性可能有助于SCFSKP2识别p27,从而有助于其调节.
- 结构洞察力为了解p27降解途径提供了基础.
- 低温电磁和先进的分析方法揭示了蛋白质复合体中的动态机制.
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