在RAD18催化下形成无化中间体,模仿增殖细胞核抗原PCNA的形成
Liying Zhang1, Zhiheng Deng1, Yunxiang Du1
1New Cornerstone Science Laboratory, Tsinghua-Peking Center for Life Sciences, Ministry of Education Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, Center for Synthetic and Systems Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China.
这项研究通过在E2-Ub结合物和PCNA等折叠蛋白质基质之间形成二硫化键来扩大泛化研究的化学捕获,从而使新的结构分析成为可能.
科学领域:
- 生物化学 生化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 化学捕获策略的2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 化学捕获策略有助于对E3酶催化无化发生的机制研究.
- 以前的CAET应用仅限于基质,不包括折叠蛋白质.
研究的目的:
- 将CAET策略扩展到折叠蛋白质基板,用于无处不在的中间模仿结构.
- 为了研究E2-Ub联合体和折叠基板之间二硫化键形成的潜力.
主要方法:
- 在E2-Ub (RAD6A-Ub) 和折叠基质 (PCNA) 之间利用二硫化键形成,由E3结合酶 (RAD18) 促进.
- 采用了整体拼接技术来创建一个稳定的RAD18-RAD6A-Ub-PCNA复合体.
- 应用化学交联质谱法 (CX-MS) 用于结构分析.
主要成果:
- 在RAD18.18的存在下,RAD6A-Ub和折叠的PCNA之间成功形成二硫化键.
- 产生了一个稳定,共价连接的复合体,适合进行结构研究.
- 启用了Ubiquitination复合物的CX-MS分析.
结论:
- 该CAET策略可以成功地应用于折叠的蛋白质基板.
- 与基质相关的E3酶可以促进基于CAET的捕获的二硫化键形成.
- 这项工作扩大了CAET的适用性,用于研究无处不在机制.
更多相关视频
10:26Profiling Ubiquitin and Ubiquitin-like Dependent Post-translational Modifications and Identification of Significant Alterations
Published on: November 7, 2019
10:59Artificial RNA Polymerase II Elongation Complexes for Dissecting Co-transcriptional RNA Processing Events
Published on: May 13, 2019
相关概念视频
Translesion DNA Polymerases
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
Restarting Stalled Replication Forks
Homologous Recombination
Mismatch Repair
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
Covalently Linked Protein Regulators
These groups modify specific amino acids in a protein....
Proofreading
Errors During Replication are Corrected by the DNA Polymerase...
