由抗Z-DNA抗体介导的B-to-Z DNA转换的结构基础
Cheng-Chung Lee1,2, Shu-Fang Hsu1, Ya-Wen Chang1
1The Ph.D. Program for Translational Medicine, College of Medical Science and Technology, Taipei Medical University, Taipei 110301, Taiwan.
Nucleic acids research
|February 28, 2026
概括
这项研究揭示了抗体如何稳定Z-DNA,这种左撇子DNA形式对各种生物过程至关重要. Z22抗体片段 (cZ22-Fab) 通过脊柱追踪结合Z-DNA,提供对DNA构造和疾病机制的见解.
科学领域:
- 结构生物学 结构生物学
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
背景情况:
- Z-DNA是一种左撇子DNA形态,涉及转录,免疫力和疾病.
- Z-DNA的不稳定性阻碍了结构和功能研究.
- 检测和稳定动态DNA的抗体机制尚不清楚.
研究的目的:
- 为抗体介导的 B-to-Z DNA 转换提供原子层次的结构洞察.
- 描述Z-DNA特异性抗体片段 (cZ22-Fab) 以及它与Z-DNA的相互作用.
主要方法:
- 一个特定于Z-DNA的仿真Fab片段 (cZ22-Fab) 的设计和表征.
- 生物物理方法包括X射线晶体学.
- 结构引导的突变发生和Z-DNA形成序列的分析.
主要成果:
- cZ22-Fab诱导一种度依赖的B-to-Z DNA转换,其Fab/DNA静电度为2:1.
- 晶体结构揭示了一个脊柱跟踪识别模式,涉及酸盐紧和基相互作用.
- 观察到一种由cZ22-Fab稳定的新型5'-end C-悬挂Z-DNA结构;确定了关键残留物R50和Y106用于Z-DNA结合.
结论:
- 这项工作阐明了抗体介导的Z-DNA形成和稳定的分子机制.
- 提供了关于动态DNA结构的抗体识别的见解.
- 突出了对自身免疫性疾病和其他与Z-DNA相关的疾病的潜在治疗相关性.
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