血膜蛋白质的BiDAC-依赖性降解由内解体系统进行
Sammy Villa1, Qumber Jafri1, Julia R Lazzari-Dean1
1Calico Life Sciences LLC, South San Francisco, CA, USA.
Nature communications
|May 9, 2025
概括
双功能降解激活化合物 (BiDACs) 促进蛋白质清除. 这项研究揭示了BiDACs可以向像EGFR和Her2这样的膜蛋白进行溶酶体降解,涉及蛋白质体和PQLC2.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 药物发现 药物发现 药物发现
背景情况:
- 双功能降解激活化合物 (BiDACs) 是一种新型药物类,促进向蛋白质清除.
- BiDACs通常通过ubiquitination将细胞质和核蛋白直接导向蛋白质体降解.
- 被BiDACs准的整体膜和器官内蛋白质的降解途径在很大程度上仍未被探索.
研究的目的:
- 研究由BiDACs诱导的血膜受体氨酸激酶 (RTKs),特别是EGFR和Her2的降解机制.
- 阐明蛋白酶体,溶酶体和其他细胞组件在BiDAC介导的RTK降解中的作用.
主要方法:
- 利用形态分析来分析由BiDACs引起的细胞变化.
- 采用CRISPR/Cas9基因选来识别参与BiDAC标降解的关键基因和途径.
- 使用细胞成像技术研究了蛋白质的贩运和定位.
主要成果:
- BiDACs诱导RTKs的无处不在,触发它们从血到溶酶体的贩运以降解.
- 功能性蛋白质体对于RTK的内细胞分裂至关重要,在溶酶体降解之前.
- 在EGFR降解中确定了与溶酶体相关的阿金/溶酶载体PQLC2在EGFR降解中的新型作用.
结论:
- 双DACs可以通过 lysosomal 途径调解膜蛋白的降解,这与proteasomal 降解不同.
- 这项研究强调了蛋白质酶在BiDAC诱导的溶酶体降解过程中的内细胞化中的非正规作用.
- 这些发现扩大了对BiDAC机制的理解,并表明了针对不同类型蛋白质降解的潜力.
更多相关视频
12:48Purification of the Membrane Compartment for Endoplasmic Reticulum-associated Degradation of Exogenous Antigens in Cross-presentation
Published on: August 21, 2017
8.2K
05:33High-Throughput Cellular Profiling of Targeted Protein Degradation Compounds Using HiBiT CRISPR Cell Lines
Published on: November 9, 2020
9.3K
相关概念视频
Export of Misfolded Proteins out of the ER
3.4K
After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
3.4K
Recycling Endosomes and Transcytosis
2.5K
The recycling endosome, also known as the endosomal recycling compartment (ERC), is a part of the slow-recycling process of the endocytic pathway. Molecules internalized through receptor-mediated endocytosis are either degraded in the lysosomes or are recycled to the plasma membrane through the fast- or slow-recycling route.
The recycling endosome is not a single organelle but an extensively tubulated network of recycling pathways. It functions in storing molecules or transporting them across...
The recycling endosome is not a single organelle but an extensively tubulated network of recycling pathways. It functions in storing molecules or transporting them across...
2.5K
Regulated Protein Degradation
7.1K
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
7.1K
Receptor-mediated Endocytosis
103.6K
Overview
103.6K
Receptor Downregulation in MVBs
2.0K
Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR...
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR...
2.0K
GPCR Desensitization
5.6K
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...
5.6K
