一个CBM101家族碳水化合物结合模块 (CBM) 的功能和结构确定:单个残留变化重塑了CBM的特异性
Xuanwei Mei1,2, Menghui Sun1, Guanchen Liu3
1State Key Laboratory of Marine Food Processing & Safety Control, College of Food Science and Engineering, Ocean University of China, 1299 Sansha Road, Qingdao 266404, China.
Journal of agricultural and food chemistry
|November 10, 2025
概括
碳水化合物结合模块 (CBM) 是用于研究碳水化合物的蛋白质工具. 研究人员发现WfCBM101与红藻类银河体结合,揭示了对CBM特异性的新见解.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 碳水化合物化学 碳水化合物化学
背景情况:
- 碳水化合物结合模块 (CBM) 是用于碳水化合物研究和应用的多功能蛋白质域.
- 阿加洛斯和福诺兰是红藻中结构相似的银河体,在差异结合研究中提出了挑战.
- 该CBM101家族包括WfCBM101,此前已知用于糖结合.
研究的目的:
- 调查WfCBM101.1.的功能和结构特征.
- 为了确定WfCBM101除了阿加罗斯之外的新型结合特异性.
- 阐明 WfCBM101 的碳水化合物识别的结构基础.
主要方法:
- 使用X射线晶体学来确定WfCBM101.1.的高分辨率 (1.5 Å) 结构.
- 进行了功能性测试,以评估WfCBM101与和的结合.
- 使用局部定向突变发生来研究特定残留物对蛋白质结合特异性的影响.
主要成果:
- 确定WfCBM101是第一个具有证明对Funoran结合亲和力的CBM.
- 晶体结构显示,WfCBM101具有由7个 β-链组成的β-三明治折叠,这些 β-链排列在两个反平行β-片中.
- 单一残留物K96的突变发生显著改变了WfCBM101的结合特异性,表明了敏感的识别机制.
结论:
- WfCBM101表现出特定的结合到funoran,扩大了CBM101家族成员的已知目标.
- 结构分析提供了对CBM碳水化合物识别背后的分子架构的见解.
- 这些发现强调了CBM的精致特异性,并为发现新的碳水化合物结合蛋白提供了基础.
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