热稳定性和结合亲和力的关系在金属结合的WW-域微受体中
Truc Lam Pham1, Marcos R Conde González1,2, Sunnatullo Fazliev1,2,3
1Institute of Organic Chemistry, Heidelberg University, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany.
Chembiochem : a European journal of chemical biology
|December 21, 2023
概括
设计稳定的金属微蛋白可以提高金属结合亲和力. 经过重新设计的WW域变体显示出更好的热稳定性,导致Ni (II),Zn (II) 和Cu (II) 等双价金属的结合明显更强.
科学领域:
- * 蛋白质工程和结构生物学.
- * 金属-超分子化学.
- *生物有机化学.生物有机化学.
背景情况:
- *金属微蛋白对于理解金属蛋白相互作用至关重要.
- *以前的WW-domain设计 (WW-CA-Nle) 显示出中度的金属结合亲和力,原因是不稳定的apo状态 (化球体).
- *金属协调涉及双价金属 (Ni(II),Zn(II),Cu(II)) 的胺残留物.
研究的目的:
- *通过提高WW领域脚手架的apo状态的热稳定性来增强金属结合亲和力.
- * 为了研究阿波状态稳定性和金属结合亲和力之间的关系.
- * 设计和描述具有改进金属协调特性的新型WW域变体.
主要方法:
- * WW域变体的蛋白质重新设计和工程 (WW-CA-min,WW-CA-ANG).
- *热稳定性测试用于Apo和Holo状态.
- *使用异热定位热量计 (ITC) 进行金属结合亲和度测量.
- *电子偏磁共振 (EPR) 光谱法用于表征金属结合部位.
主要成果:
- *重新设计的WW-CA变体 (WW-CA-min,WW-CA-ANG) 呈现出稳定,完全折叠的apo状态.
- *这些变体在阿波和全息状态下显著改善了热稳定性.
- *与WW-CA-Nle.相比,金属结合亲和力至少增加了一级 (Kd值较低)
- * EPR和ITC数据显示,WW-CA-ANG的金属结合场地更为明确和预先组织.
结论:
- * 亚波状态的热稳定性提高与WW域支架中的金属结合性增强直接相关.
- *重新设计的WW-CA变体代表了在制造高亲和度金属微蛋白方面取得的重大进步.
- * 这些发现为设计具有量身定制功能的更复杂的金属结合蛋白提供了基础.
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