关联性而不是序列的保护是光鱼中因子介导的p53/MDM2相互作用的动态演变的基础
Filip Mihalič1, Dahiana Arcila2, Mats E Pettersson1
1Department of Medical Biochemistry and Microbiology, Uppsala University, BMC, Uppsala SE-75123, Sweden.
Molecular biology and evolution
|February 1, 2024
概括
在鱼类中,p53交换活化域 (p53TAD) 和MDM2的相互作用通过重复的,融合的变化而演变. 侧边区域的补偿相互作用保持了功能结合亲和力,使预测变得复杂.
科学领域:
- 分子生物学分子生物学
- 进化生物学 进化生物学
- 生物化学 生物化学
背景情况:
- 瘤抑制剂p53受MDM2的调节,这是一个全方位基酶.
- 它们的相互作用对细胞循环控制至关重要,并且由与MDM2的SWIB域结合的p53交换活化域 (p53TAD) 动机介导.
- 与人类和肉相比,斑马鱼的p53TAD对MDM2的结合明显较弱.
研究的目的:
- 研究光鱼 (Actinopterygii) 中p53TAD/MDM2相互作用的分子演变.
- 了解如何保持结合亲和力,尽管保留动机的变化.
- 探索侧边区域在调节蛋白质-蛋白质相互作用强度中的作用.
主要方法:
- 对Actinopterygii. 的遗传学分析.
- 对p53TAD的祖先序列重建.
- 在体外结合实验测量亲和力 (KD值).
主要成果:
- 在鱼系中,p53TAD正规动机中的收性,失去亲和力的突变反复发生.
- 侧面的p53TAD非保存区域补偿了动机减弱,使亲和力增加了4至73倍.
- 观察到的亲和关系与人与人之间的相互作用相似,这表明对功能亲和关系的稳定选择.
结论:
- 通过动机内部的变化和侧边区域的补偿相互作用的结合,保持了p53TAD/MDM2相互作用亲和力.
- 进化动态涉及保存的图案残留物和非保存的无序区域之间的相互作用.
- 结合亲和力的生物信息预测具有挑战性,需要实验验证.
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