通过G4L-PROTAC通过四度复合形成,降解G-四复合结合蛋白
Rena Nohara1, Yuma Tanaya1, Mohammad Jafar Sheikhi1
1Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan.
Angewandte Chemie (International ed. in English)
|October 6, 2025
概括
研究人员开发了G4L-PROTACs,这些分子只在与G-quadruplexes (G4s) 结合时,才能选择性降解G-quadruplex结合蛋白 (G4BPs). 这种有针对性的方法允许精确研究细胞中的G4-G4BP相互作用.
科学领域:
- 分子生物学分子生物学
- 基因组学就是基因组学.
- 化学生物学 化学生物学
背景情况:
- G四重复体 (G4s) 是关键的非正规DNA结构,参与基因调节.
- G4结合蛋白 (G4BPs) 与G4s相互作用以控制细胞过程,但它们在结合状态中的功能尚不清楚.
- 像RNAi和CRISPR-Cas9这样的现有方法缺乏对结合蛋白的特异性.
研究的目的:
- 开发一种新的化学生物学工具,用于选择性降解与G4结合的G4BPs.
- 调查G4BPs在其结合状态中的功能作用.
- 为探索G4-G4BP相互作用和治疗向创建一个平台.
主要方法:
- 设计和合成G4L-PROTACs,连接G4和E3酶招募器的双功能分子.
- 在实验室中,使用G4模型图案对三元复合体形成的研究.
- 细胞实验涉及G4L-PROTAC治疗,西式涂抹和BG4免疫光,以评估G4BP水平和G4丰度.
主要成果:
- G4L-PROTACs成功诱导了G4结合的G4BPs的选择性蛋白质体降解.
- 治疗降低了内源性DHX36水平,导致细胞内G4结构增加.
- G4L-PROTACs精确调节G4蛋白相互作用,而不会引起G4介导的转录沉默.
结论:
- G4L-PROTACs代表了研究活细胞中的G4-G4BP动态的强大策略.
- 这种方法可以对G4BP进行精确的功能查询.
- G4L-PROTACs具有针对G4相关蛋白的治疗潜力.
相关概念视频
GPCR Desensitization
7.9K
G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
7.9K
GTPases and their Regulation
9.7K
Guanine nucleotide-binding proteins (G-proteins), also known as GTPases, are a superfamily of proteins that regulate many cellular processes, such as cell signaling, vesicular transport, and the regulation of cell shape and motility. Mutation or dysfunction of these proteins can lead to disease. There are around 40,000 known G-proteins that can broadly be classified into two groups ‒ small G-proteins consisting of a single domain and large multi-domain G-proteins.
Large G-proteins,...
Large G-proteins,...
9.7K
Activation and Inactivation of G Proteins
10.9K
Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high...
10.9K
Ligand Binding and Linkage
5.5K
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
5.5K
The Proteasome
10.1K
Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
10.1K
The Proteasome
1.6K
Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
1.6K


