最佳的TELSAM-目标蛋白链接器特征是依赖目标蛋白的
Maria Jose Pedroza Romo1, Alihikaua Keliiliki1, Jacob C Averett1
1Brigham Young University-Provo: Brigham Young University.
bioRxiv : the preprint server for biology
|September 15, 2025
概括
优化蛋白质结晶包括在TELSAM伴侣蛋白和标蛋白之间选择正确的链接器. 连接器的选择和His标签的存在对晶体质量和结构研究的衍射极限产生重大影响.
科学领域:
- 结构生物学 结构生物学
- 生物化学 生物化学
- 晶体学 晶体学是指结晶学.
背景情况:
- 人类转位ETS白血病蛋白的无菌α基因域 (TELSAM) 通过形成稳定的格子来增强蛋白质结晶.
- 晶体质量和衍射极限在很大程度上取决于链接器的选择和N端10xTELSAM上的标签.
- 目前用于识别最佳链接器的方法通常是试错的.
研究的目的:
- 系统地评估不同的链接类型和长度,用于将TELSAM融合到标蛋白.
- 评估N端10xHis标签对TELSAM介导蛋白质结晶的影响.
- 确定最佳的链接器策略,以改善蛋白质结晶和高分辨率结构确定.
主要方法:
- 在TELSAM和目标蛋白 (DARPin,TNK1 UBA域) 之间设计和构建了具有不同链接器 (刚性,半灵活,灵活) 的多重融合蛋白.
- 用N端10xHis标签和没有N端10xHis标签进行构造.
- 分析了结晶倾向,晶体大小,形态和衍射质量.
主要成果:
- 短的半柔性和刚性链接器通过DARPin目标迅速产生了大型晶体.
- 灵活的链接器对TNK1 UBA域点蛋白质是最佳的.
- 删除10xHis标签通常会改善结晶率,形态和倾向.
- 他的标签去除增强了特定结构的衍射极限和晶体质量.
结论:
- 连接器选择对于成功的TELSAM介导结晶至关重要,并且依赖蛋白质.
- 建议使用短,灵活或半灵活的链接器来实现最佳的蛋白质结晶.
- 删除His标签可以改善结晶结果,有助于高分辨率的结构确定.
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