来自96号家族的新型碳水化合物结合模块的表征和结构分析,具有特定于硫酸的结合能力
Guanchen Liu1, Xuanwei Mei1, Yuying Zhang1
1College of Food Science and Engineering, Ocean University of China, 1299 Sansha Road, Qingdao 266404, China.
Journal of agricultural and food chemistry
|May 28, 2024
概括
研究人员发现了两种新的氏丁硫酸盐结合蛋白DmCBM96-1和DmCBM96-2. 这些碳水化合物结合模块 (CBM) 提供了用于研究二硫酸盐 (CS) 的新工具,并扩大了已知的CBM96家族的多样性.
科学领域:
- 生物化学 生化学
- 结构生物学 结构生物学
- 葡萄糖生物学 葡萄糖生物学
背景情况:
- 氏丁硫酸盐 (CS) 是人体中具有广泛工业应用的关键糖氨基酸.
- 碳水化合物结合模块 (CBM) 对于识别和研究多糖是必不可少的.
- 以前,只有一个CS特定的CBM (PhCBM100) 被描述,这限制了对CS绑定的CBM多样性的理解.
研究的目的:
- 发现和描述具有对氏丁硫酸盐特异性的新型CBM.
- 阐明这些新发现的CS结合蛋白的结构和功能性质.
- 扩大氏丁硫酸盐调查工具包,了解CBM家族多样性.
主要方法:
- 两个CBM96域 (DmCBM96-1和DmCBM96-2) 的重组表达来自一个假定的冠状素AC溶解酶.
- 生物化学试验包括微板试验和亲和凝电泳,以确定CS结合特异性.
- 通过X射线晶体学,确定DmCBM96-1.的2.20 Å分辨率的晶体结构.
- 位点定向突变发生,以确定参与CS结合的关键残留物.
主要成果:
- DmCBM96-1和DmCBM96-2成功地表达,并证明了与氏素硫酸盐的特定结合.
- DmCBM96-1的晶体结构显示出β-三明治折叠,结构上与其他CBM96家族成员相似.
- 现场突变基因检测发现了关键残留物 (Arg27,Lys45,Tyr51,Arg53,Arg157),这些残留物对于DmCBM96-1的CS结合活性至关重要.
结论:
- 对DmCBM96-1和DmCBM96-2的表征突出了CBM96家族内的多种联体特异性.
- 这些新型的CS结合蛋白为未来的研究和应用中具有价值的工具,涉及氏丁硫酸盐.
- 这些发现有助于更深入地了解碳水化合物-蛋白质相互作用以及CBM的功能多样性.
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