在Plasmodium falciparum B var基因的促进体内形成的长环G-四重复的溶液状态结构
Marina Juribašić Kulcsár1,2, Valérie Gabelica3, Janez Plavec1,4,5
1Slovenian NMR Center, National Institute of Chemistry, Hajdrihova 19, SI-1000, Ljubljana, Slovenia.
Chemistry (Weinheim an der Bergstrasse, Germany)
|April 22, 2024
概括
这项研究揭示了来自Plasmodium falciparum的DNAG-四重复的高分辨率结构,这对疟疾至关重要. 它存在于两个形式之间的独特平衡中,为基因调节提供了洞察力.
科学领域:
- 结构生物学 结构生物学
- 分子生物学分子生物学
- 寄生虫学的寄生虫学
背景情况:
- G四重复体是涉及基因调节的非正规DNA结构.
- 菌的 var 基因对疟疾病原和免疫逃避至关重要.
- 了解病原体中的DNA结构是开发新疗法的关键.
研究的目的:
- 为了确定来自Plasmodium falciparum的分子内G四重复体 (UpsB-Q-1) 的高分辨率溶液状态结构.
- 在生理学上相关的条件下,研究这种G-四重复的结构动力学和稳定相互作用.
- 阐明G-四重复结构在不同基因调节中的作用.
主要方法:
- 使用高分辨率核磁共振 (NMR) 谱学来确定3D结构.
- 对34个核酸DNA序列 (UpsB-Q-1) 的分析,形成了分子内G-四重复.
- 研究结构平衡和稳定力,包括基层堆叠和结合.
主要成果:
- 已经阐明了UpsB-Q-1 G-quadruplex的高分辨率NMR结构.
- 观察到两个密切相关的3D结构之间的独特平衡,通过基堆叠和非正规键稳定.
- 结构平衡归因于横环内T27残留物中脱氧化部分的南北回复.
- 循环残留物积极参与G-四重奏-循环接口的相互作用.
结论:
- UpsB-Q-1 G-四重复采用具有显著结构可塑性的 [3+1] 混合结构.
- 观察到的结构平衡为G-四重复动力学和稳定性提供了新的见解.
- 这种G-quadruplex结构可能在调节Plasmodium falciparum var基因方面发挥作用,影响疟疾的发病性.
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