在lysine残留物上SpSrtA催化异酸结合
Jiajia Wu1,2, Tianyu Chu3, Jian Hao1
1Department of Chemistry, Shanghai University, Shanghai 200444, China.
Microorganisms
|January 23, 2024
概括
这项研究引入了一种用于蛋白质生物结合的新型类酶A突变体 (SpSrtA*),使氨酸残留物的修饰成为可能. 这扩大了对各种蛋白质和表面的索尔塔酶介导结合 (SML) 应用.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 蛋白质工程是指蛋白质的工程.
背景情况:
- 排序酶介导结合 (SML) 是一种关键的蛋白质生物结合技术.
- 现有的分类酶主要识别N端的寡甘氨酸标签,限制它们与天然蛋白质的使用.
- 来自Streptococcus pneumoniae (SpSrtA) 的A类酶表现出更广泛的基质特异性.
研究的目的:
- 为了研究新的SpSrtA突变 (SpSrtA*) 对于其修改氨酸残留物的能力.
- 开发和优化基于SpSrtA*的蛋白质修饰策略.
- 使用SpSrtA*提高蛋白质生物结合效率.
主要方法:
- 使用了具有扩展基质特异性的SpSrtA突变 (SpSrtA*).
- 使用液体染色学-并联质谱法 (LC-MS/MS) 确定了SpSrtA*修饰点.
- 开发并选了含氨酸的标签,并通过酵母显示使用了定向进化.
主要成果:
- 已证明,SpSrtA*可以修改自身和其他蛋白质中的氨酸残留物.
- 通过对sfGFP合的优化氨酸含标签,实现了57%的标记效率.
- 通过定向进化,增强了表面蛋白质标记的多达13.5倍,并提高了SpSrtA*活动的10倍.
结论:
- SpSrtA*提供了一种用于氨酸残留物修饰的新策略,扩大了蛋白质生物结合工具箱.
- 这种方法促进了微生物表面蛋白质的高效修改.
- 针对SpSrtA*的定向进化显著提高了其用于蛋白质工程应用的标签效率.
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