UBR5在染色质上形成依赖于连接体的复合体,以调节核激素受体的稳定性
Jonathan M Tsai1, Jacob D Aguirre2, Yen-Der Li3
1Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Division of Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA; Broad Institute of MIT and Harvard, Cambridge, MA, USA.
无素结合酶UBR5在激动剂结合后降解多个核激素受体 (NR),这是癌症治疗中至关重要的过程. 这一发现揭示了UBR5作为NR介导转录的关键调节者.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 核激素受体 (NRs) 是关键的药物标.
- 激动剂诱导的NR降解对于某些癌症的治疗疗效至关重要.
- 负责NR降解的基酶机制在很大程度上是未知的.
研究的目的:
- 为了确定负责激素诱导的NR降解的乌比基因酶.
- 阐明由UBR5.5进行NR降解的结构和机制基础.
- 了解UBR5在调节NR介导转录中的作用.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于确定人类UBR5.5的结构.
- 负染色电子显微镜模拟UBR5与RARA/RXRA的相互作用.
- 生物化学测试以评估NR降解和招募动态.
主要成果:
- 鉴定出UBR5是降解多种激动剂结合的NRs (包括RARA,RXRA等) 的乌比奎丁结合酶.
- 确定了UBR5的高分辨率冷EM结构及其与RARA/RXRA相互作用的模型.
- 激素连接体诱导了联合激活剂和UBR5对染色素的顺序招募.
- 选择性雌激素受体降解剂 (SERDs) 使用UBR5或RNF111进行受体降解.
结论:
- UBR5是广泛的核激素受体的激素诱导降解的中心调解者.
- UBR5作为一个转录调节枢纽,将NR活动与降解途径联系起来.
- 针对UBR5-NR相互作用可能为NR驱动的疾病提供新的治疗策略.
更多相关视频
09:07Detecting the Ligand-binding Domain Dimerization Activity of Estrogen Receptor Alpha Using the Mammalian Two-Hybrid Assay
Published on: December 19, 2018
11:07Biochemical Reconstitution of Steroid Receptor•Hsp90 Protein Complexes and Reactivation of Ligand Binding
Published on: September 21, 2011
相关概念视频
Transducer Mechanism: Nuclear Receptors
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
Regulation of Nuclear Protein Sorting
Co-activators and Co-repressors
Covalently Linked Protein Regulators
These groups modify specific amino acids in a protein....
Regulation of Expression at Multiple Steps
Nucleosome Remodeling
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
