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大型氨酸整合酶利用被清除的菌体蛋白作为方向性辅因子

Abdulrazak Alsaleh¹, Alexandria Holland¹, Heewhan Shin²

¹School of Pharmacy & Biomolecular Sciences, Faculty of Health, Innovation, Technology, and Science, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, United Kingdom.

Nucleic acids research

|February 5, 2025

概括

大型血清整合酶 (LSIs) 的重组定向因子 (RDF) 可能是月光蛋白. 实验数据表明,TG1 RDF作为单链DNA结合蛋白,Bxb1 RDF作为外核酶.

科学领域:

分子生物学分子生物学
结构生物学结构生物学
生物化学生物化学

背景情况:

重组定向因子 (RDFs) 是大型血清整合酶 (LSIs) 的重要辅因子,控制DNA重组定向.
已知的RDF中的结构多样性表明潜在的月光作用,其中蛋白质执行的功能超出了它们最初的特征作用.

研究的目的:

通过将其预测的结构与已知的蛋白质进行比较,研究RDF的潜在月光功能.
通过实验验证TG1和Bxb1RDF的拟议功能.

主要方法:

对已知的RDF进行了生物信息结构相似性搜索.
实验分析用于测试TG1和Bxb1RDFs的DNA结合和酶活性.
使用AlphaFold2多分子预测和突变分析来研究TG1整合酶-RDF相互作用.

主要成果:

针对TG1和Bxb1整合酶的RDF与单链DNA结合 (SSB) 蛋白和编辑外核酶具有结构上的相似性.
实验证据支持TG1 RDF是一种功能性的SSB蛋白,而Bxb1 RDF可能作为外核酶起作用.
突变分析证实了TG1整合酶及其RDF之间的预测蛋白质-蛋白质相互作用接口,这对于重组方向性控制至关重要.

结论:

这些发现支持RDFs的月光假设,揭示了新的酶和DNA结合功能.
在特定接口的蛋白质与蛋白质相互作用中介于LSIs及其RDFs对重组定向的控制.

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