失调的DNA结合动机形成了一个调制位点,用于抑制癌症免疫治疗点TREX1
Kuan-Wei Huang1,2,3, Chieh- Yu Tsai1, Chia-Yun Wu1,2
1College of Engineering Bioscience, National Yang Ming Chiao Tung University, Hsinchu 30068, Taiwan.
Nucleic acids research
|January 14, 2026
概括
研究人员发现了一种通过抑制TREX1外核酶来向癌症免疫治疗的新方法. 新型抑制剂结合到内在无序的α7-α8循环,破坏DNA结合和免疫抑制活性.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 免疫学 免疫学 免疫学
背景情况:
- 短线性基因 (SLiM),一种内在无序区域 (IDR),在核酸结合蛋白中至关重要,但其作用尚未完全理解.
- 针对SLiM提供了治疗潜力,特别是在癌症免疫治疗中.
研究的目的:
- 研究核酸结合蛋白中内在无序区域 (IDR) 的结构和功能作用.
- 为癌症免疫治疗确定针对TREX1外核酶的新型抑制剂.
主要方法:
- 使用X射线晶体学来确定与新发现的抑制剂结合的TREX1α7-α8循环的结构.
- 用分子动力学模拟来阐明结合机制.
- 进行了功能性测试,以评估抑制剂对TREX1活性的影响.
主要成果:
- 在TREX1的内在无序的α7-α8循环中发现了一个新的调制位点,远离活性位点.
- 抑制剂结合在α7-α8循环中诱导了无序到有序的过渡,并观察到一致的多顶点紧模式.
- 结构分析和模拟揭示了模糊的TREX1抑制剂相互作用,抑制剂部分与两性单元结合.
- 确定的抑制剂有效地破坏了TREX1的DNA结合和免疫抑制活性.
结论:
- 在TREX1α7-α8循环代表一个可药物治疗的短线性图案 (SLiM).
- 这项研究提供了针对DNA结合SLiM的小分子抑制的原子级细节.
- 发现的机制原理可能适用于向癌症免疫治疗中的IDR.
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