在体外由α-synuclein形成的粉样蛋白主要是由疏水界面的反应主导的
Jeremy Pronchik1, Xianglan He, Jason T Giurleo
1Department of Chemistry and Chemical Biology, Wright-Rieman Laboratories, Rutgers, the State University of New Jersey, New Brunswick, 610 Taylor Road, Piscataway, New Jersey 08854, USA.
Journal of the American Chemical Society
|June 29, 2010
概括
刺激加速alpha-Synuclein (alphaSyn) 氨基代,主要是通过疏水-水接口反应,而不是质量转移或碎片化. 这一发现需要重新解释影响alphaSyn聚合倾向的因素.
科学领域:
- 生物化学 生物化学
- 神经科学是一个神经科学.
- 材料科学 材料科学 材料科学
背景情况:
- 在体外对α-Synuclein (alphaSyn) 聚合的研究中,经常使用激发来加快氨基基基因的产生.
- 现有的假设将动的影响归因于质量转移或纤维细胞碎片化.
- 疏水界面在alphaSyn聚合动力学中的作用仍未得到充分研究.
研究的目的:
- 调查激发增强的α-Synuclein (alphaSyn) 氨基基基因生成的潜在机制.
- 为了区分质量转移,纤维分裂和疏水界面相互作用.
- 根据实验发现,重新评估影响alphaSyn聚合倾向的因素.
主要方法:
- 通过对聚四乙烯 (PTFE),聚甲基甲酸盐 (PMMA) 和玻璃玻璃球的控制表面积来激发α-Synuclein (alphaSyn).
- 使用硫黄素T光检测粉样蛋白的形成.
- 使用原子力显微镜对聚合物形态的描述.
主要成果:
- 粉样蛋白形成动力学与聚四乙烯 (PTFE) 表面积成正比.
- 与PTFE相比,聚甲基甲酸盐 (PMMA) 和玻璃酸盐的效果是可以忽略不计的.
- 仅用空气动加速了动力学,但改变了聚合物形态;没有混合球,就没有形成粉样蛋白.
结论:
- 在激发驱动的α-Synuclein (alphaSyn) 氨基基基因生成中占主导地位的机制涉及水-水界面的反应.
- 质量转移和纤维细胞碎片化不足以解释观察到的动力学.
- 氨基原性倾向的决定因素应该重新解释为疏水性水分区分,这与体内条件不同.
相关概念视频
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...
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...
Protein Folding
Overview
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...
Protein-protein Interfaces
Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
Mechanisms of Membrane Domain Formation
Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...


