对氨酸介导的WIN位点识别的结构洞察力揭示了WDR5结合的另一个"AK"动机
Yan Pan1, Hao Li1, Lihong Chen1
1School of Life Sciences, Anhui University, Hefei, Anhui, 230601, China.
Biochemical and biophysical research communications
|August 7, 2025
概括
WD重复含有蛋白5 (WDR5) 与氨酸相互作用,而不仅仅是氨酸,在一个新的WIN动机. 这一发现重新定义了WDR5结合,并为治疗抑制剂提供了新的点.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 分子生物学分子生物学
背景情况:
- 含WD重复蛋白5 (WDR5) 是一种关键的染色素相关的支架蛋白.
- WDR5通过识别WDR5交互 (WIN) 图案来促进转录复合组合,传统上认为这些图案依赖于氨酸.
研究的目的:
- 阐明WDR5 MBD3C_R43K变种保留与WDR5.5的结合的结构机制.
- 研究素在WDR5相互作用中的作用,并重新定义WIN动机共识.
主要方法:
- 在1.9 Å分辨率下测定WDR5-MBD3C(R43K) 复合结构的X射线晶体学.
- 与AlphaFold3预测进行比较分析,以评估模型准确性.
主要成果:
- 晶体结构显示,位于43位 (K43) 的氨酸可以插入WDR5 WIN口袋,模仿阿金相互作用.
- 氨酸侧链与Ser91形成键,并与关键的WDR5残留物 (Ser49,Phe133,Cys261,Ile305) 形成疏水接触.
- 实验结构与AlphaFold3预测相矛盾,突出了突变蛋白质-复合物的当前计算模型的局限性.
结论:
- 获胜动机共识扩展到包括"AK"动机,识别氨酸和氨酸.
- 扩大了WDR5基质的识别范围,包括+2,+3和+4.4位置的残留物.
- 这些发现为设计针对氨酸介导相互作用的新型WDR5抑制剂提供了结构基础.
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