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生物ID近距离测绘揭示了前体组复合体中的新型SAP18相互作用
Sweta Kumari1, Ankita Adhikary1, Kusum Kumari Singh1
1Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India.
Biochemical and biophysical research communications
|November 10, 2024
概括
SAP18蛋白与转录抑制和RNA拼接机械相互作用. 这项研究揭示了它与前复合体 (prespliceosome) 的新联系,这是RNA拼接中的一个关键复合体.
科学领域:
- 分子生物学分子生物学
- 基因法规 基因法规
- 蛋白相互作用 蛋白相互作用
背景情况:
- 众所周知,SAP18蛋白与SIN3转录抑制器综合体有关.
- SAP18也是亡和拼接相关蛋白质 (ASAP) 综合体的组成部分,表明其具有双重作用.
- 了解SAP18的体内相互作用对于阐明其在基因调节和拼接中的功能至关重要.
研究的目的:
- 用近距离依赖生物素识别 (BioID) 来定义SAP18的体内相互作用体.
- 确定SAP18参与转录和拼接调节的新型蛋白质合作伙伴.
- 调查SAP18在预复合体中的作用及其与ASAP复合体的关联.
主要方法:
- 靠近依赖生物素识别 (BioID),然后进行质谱测量.
- 生物化蛋白质的生物化学分化和斯特列塔维丁净化.
- 免疫沉试验和SAP18的突变分析.
主要成果:
- 识别新的SIN3关联反应器,包括RBBP4和SAP30BP.
- 发现72种高度丰富的结合体蛋白与SAP18相互作用.
- 验证了SAP18与前体组件 (SNRNP70,SNRPA,SF3B1,U2AF1,SRSF1) 之间的新型相互作用.
- 证明一个C端SAP18突变体损害了与前体蛋白的相互作用.
结论:
- SAP18拥有复杂的互动组,将其与转录抑制和RNA拼接联系起来.
- SAP18直接与预复合体的关键组件相互作用.
- 该ASAP复合体参与调解SAP18与预复合体的相互作用.
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