对神经调节素-1和E-卡德林的γ-分泌酶介导的内蛋白分解
Shweta R Malvankar1, Michael S Wolfe1
1Department of Medicinal Chemistry, School of Pharmacy, The University of Kansas, Lawrence, Kansas 66045, United States.
Biochemistry
|July 1, 2025
概括
玛分泌酶在跨膜领域内切割基质. 这项研究证实了对神经调节素1和E-cadherin在P2'处的氨不耐受规则,澄清了分裂部位,并支持了对玛分泌酶基质的一般规则.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 神经科学是一个神经科学.
背景情况:
- 玛分泌酶是一种带有众多基质的膜内蛋白酶复合体.
- 粉样蛋白前体蛋白 (APP) 通过玛分泌酶的蛋白解释放粉样蛋白-β,与阿尔茨海默病有关.
- 关于其他玛分泌酶基质的裂变的知识有限.
研究的目的:
- 通过玛分泌酶识别神经调节素1 (NRG1) 和E-cadherin (CDH1) 的初始裂解部位.
- 为了研究这些基质的P2'位置的氨 (Phe) 不耐受规则.
- 要确定Phe规则是否是玛分泌酶基质的一般特异性.
主要方法:
- 将重组NRG1和CDH1与纯化的玛分泌酶复合体进行化.
- 质谱学 (MS) 和免疫斑块分析以确定裂变产物.
- 在P2'位置分析Phe突变,以评估裂变位移和产品产量.
主要成果:
- 确定了NRG1跨膜域 (TMD) 中的两个分裂点和CDH1 TMD中的一个.
- CDH1 TMD 分裂部位与之前报告的细胞分裂部位不同.
- 对于NRG1和CDH1.1,P2'的突变改变了裂变部位,并减少了产品的形成.
结论:
- 澄清了NRG1和CDH1.1的初始马分泌酶裂解部位.
- 提供了支持P2' Phe不耐受性的证据,作为对玛分泌酶基质的一般规则.
- 扩大了对超越APP的马分泌酶基质加工的理解.
相关概念视频
Receptor Downregulation in MVBs
2.2K
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...
2.2K
Export of Misfolded Proteins out of the ER
3.9K
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...
3.9K
Regulated Protein Degradation
7.7K
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...
7.7K
Protein Folding Quality Check in the RER
3.9K
ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
3.9K
GPCR Desensitization
6.6K
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...
6.6K
Cadherins in Tissue Organization
3.2K
The cadherins are a superfamily of cell adhesion molecules comprising over 180 variants, with specific tissues expressing a particular combination of cadherin types. Cadherins generally exhibit homophilic binding; i.e., cadherins on one cell bind to cadherins of the same or closely related type on another cell. Thus, cells of the same type have a specific affinity to bind to each other and sort themselves into clusters to form tissues.
Cell Sorting During Development
Cell sorting plays an...
Cell Sorting During Development
Cell sorting plays an...
3.2K


