相关实验视频
Updated: Jun 24, 2026

05:48
Rapid Generation of Amyloid from Native Proteins In vitro
Published on: December 5, 2013
人类小岛粉样多的"在路径"和"离路径"寡合体的结构和形态动力学
Daniel Warren1, Jadon Sitton1, Dmitry Kurouski1,2
1Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas, USA.
Protein science : a publication of the Protein Society
|March 3, 2026
概括
人类小岛粉样多 (IAPP) 聚合在2型糖尿病中涉及明显的甜甜圈状和圆形寡合体. 纤维的形成和持久的离路聚合物都会导致胰腺细胞毒性.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 糖尿病研究 糖尿病研究
背景情况:
- 细胞毒性人类小岛粉样蛋白聚 (IAPP) 总沉积是2型糖尿病的标志.
- IAPP聚类物种的结构演变和细胞毒性尚未得到充分理解.
研究的目的:
- 使用测试组合来解决IAPP聚合的形态动态.
- 区分"在路径"和"离路径"IAPP聚合物及其在细胞毒性中的作用.
主要方法:
- 使用了动力学,生物物理分析和细胞分析.
- 原子力显微镜 (AFM) 和AFM红外光谱 (AFM-IR) 用于观察寡合体的形成和结构.
- 细胞毒性测试评估了IAPP聚合物对胰腺β细胞的影响.
主要成果:
- 在早期IAPP聚合过程中,确定了两个不同的寡合体,即甜甜圈状 (DO) 和圆形寡合体 (RO).
- 具有平行β片结构的DO,是"路径上的"和短暂的,在纤维形成之前.
- 具有结构失调的RO是"偏离路径"和持久的,导致细胞毒性.
- 无论是IAPP纤维的形成还是持久的RO物种都会导致胰腺β细胞的毒性.
结论:
- IAPP聚合是一个复杂的过程,涉及"路径"和"路径外"物种.
- 了解这些聚合途径对于预防II型糖尿病中IAPP诱导的细胞毒性至关重要.
- 进化的粉样蛋白结构和持久的偏离路径寡合体都与疾病病理学有关.
相关概念视频
Protein Folding
Overview
Protein and Protein Structure
Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme can...
A protein's shape is critical to its function. For example, an enzyme can...
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, normally used to...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...
Oligosaccharide Assembly
Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
Multiple sugar molecules that may or may...
Multiple sugar molecules that may or may...
Protein Folding
Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
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, normally used to...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...

