相关实验视频

Updated: Jun 12, 2025

Characterization of pH-Dependent Reversible Self-Assembly of Amyloid Beta 1-40-Coated Gold Colloids

Characterization of pH-Dependent Reversible Self-Assembly of Amyloid Beta 1-40-Coated Gold Colloids

Published on: March 21, 2025

CsgA守门员残留物控制核化,但不能控制功能性粉样蛋白的稳定性

William P Olsen^1,2, Gaston Courtade³, Samuel Peña-Díaz¹

¹Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C, Denmark.

Protein science : a publication of the Protein Society

|September 20, 2024

概括

功能性粉样蛋白是由守门员残留物调节的. 引入更多的守门者会通过影响初始核形成来减缓纤维素的形成,但不会改变最终纤维素的稳定性或结构.

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:

对于生物体来说必不可少的功能性粉样蛋白与与疾病有关的粉样蛋白通过调节的纤维化而有所不同.
守门者残留物,如酸 (Asp),对于这种调节至关重要,但它们的精确分子作用尚未完全理解.

研究的目的:

调查额外的守门者残留物对埃舍里奇亚大肠杆菌 (E. coli) 功能性粉样CsgA的纤维化过程和稳定性的影响.

主要方法:

在CsgA中逐步引入Asp守门员残留物.
带有和没有预制纤维的动测定.
高灵敏度林依赖性 (HSQC) 核磁共振 (NMR) 谱法用于评估蛋白质障碍.
基于NMR的暗态交换和转移 (DEST) 实验来分析单体纤维相互作用.

主要成果:

额外的守门者残留物显著抑制了新纤维的形成,主要是通过阻碍核的形成.
引入额外的守门员并没有影响CsgA纤维的稳定性.
CsgA及其变体本质上仍然是无序的,而守门员的引入并没有改变这一点.
DEST实验揭示了单体和纤维素之间的短暂相互作用减少在变体有更多的守门员,表明它们在纤维素动力学的重要性.

结论:

守门者残留物通过影响核形成和单体纤维相互作用来调节功能性粉样纤维化的动力学.
这些残留物可以微调纤维素的特性,而不会损害得到的粉样蛋白的结构完整性.
守门者作为有效和有选择的工具来控制粉样纤维素的特征.

关键词:

这些章节.这就是CsgA.这就是NMR的NMR.这是一个很棒的节目.卷曲曲的卷曲曲的功能性氨基化物守门人守门人守门人守门人

更多相关视频

Screening for Amyloid Aggregation by Semi-Denaturing Detergent-Agarose Gel Electrophoresis

Screening for Amyloid Aggregation by Semi-Denaturing Detergent-Agarose Gel Electrophoresis

Published on: July 16, 2008

Imaging the Intracellular Trafficking of APP with Photoactivatable GFP

Imaging the Intracellular Trafficking of APP with Photoactivatable GFP

Published on: October 17, 2015

相关概念视频

Amyloid Fibrils

Amyloid Fibrils

Amyloid fibrils are aggregates of misfolded proteins. Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils.
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...

Protein Folding Quality Check in the RER

Protein Folding Quality Check in the RER

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...

Protein Folding

Protein Folding

Ligand-Gated Ion Channel Receptor: Gating Mechanism

Ligand-Gated Ion Channel Receptor: Gating Mechanism

Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...