突变维生素D结合蛋白中的差分甘油化破坏了维生素D的结合稳定性
Usama1, Zahid Khan1, Aktar Ali2
1Biochemistry Section, Institute of Chemical Sciences, University of Peshawar, Peshawar, Khyber Pakhtunkhwa, Pakistan.
Journal of biomolecular structure & dynamics
|June 26, 2023
概括
维生素D结合蛋白 (VDBP) 突变会影响其结构和维生素D (VD) 结合. 在Thr418的糖化稳定了VDBP-VD亲和力,而其在GC-2变体中的损失损害了VD传输.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 分子生物物理学 分子生物物理学
背景情况:
- 维生素D (VD) 缺乏与危险因素有关,包括其运输蛋白,维生素D结合蛋白 (VDBP) 的遗传变异.
- 常见的单核酸多态 (rs7041和rs4588) 产生像GC-1F (野生类型) 和GC-2这样的VDBP异型.
- 了解这些遗传变化如何影响VDBP的结构和功能,对于静脉疾病的平衡至关重要.
研究的目的:
- 研究VDBP突变 (GC-1F与GC-2) 对VD结合亲和力和蛋白质构造的影响.
- 阐明糖化,特别是Thr418在VDBP-VD相互作用和稳定性中的作用.
- 揭示远程突变影响VDBP结构和VD结合的新机制.
主要方法:
- 为GC-1F和GC-2VDBP异型在糖化状态下构建3D模型.
- 使用分子力学毒-博尔兹曼表面积 (MM-PBSA) 方法估计结合亲和度.
- 通过自由能源景观估计来研究构造变化.
主要成果:
- 与GC-2 (-95 kJ/mol) 相比,GC-1F具有显著更强的VD结合亲和力 (-116.09 kJ/mol).
- GC-1F显示了更简化的分子运动,表明结构稳定性比GC-2更高.
- 在Thr418的糖化对于稳定关键结构环而对VDBP-VD亲和力至关重要;在GC-2中缺少它会损害域间稳定性.
结论:
- 在VDBP中的突变,特别是GC-2中的糖化损失,改变蛋白质构造并降低VD结合亲和力.
- 这些结构变化可能会影响维生素D的运输和成熟,导致VD缺乏.
- 这项研究发现了一种新的机制,即远程突变会影响VDBP的结构和功能,影响VD的生物可用性.
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