Folding and membrane insertion of amyloid-beta (25-35) peptide and its mutants: Implications for aggregation and neurotoxicity

NCU Institutional Repository > 理學院 > 化學學系 > 期刊論文 > Item 987654321/50710

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/50710

题名:	Folding and membrane insertion of amyloid-beta (25-35) peptide and its mutants: Implications for aggregation and neurotoxicity
作者:	Tsai,HHG;Lee,JB;Tseng,SS;Pan,XA;Shih,YC
贡献者:	化學學系
关键词:	MOLECULAR-DYNAMICS SIMULATIONS;SIDE-CHAIN INTERACTIONS;FREE-ENERGY LANDSCAPE;LIPID-BILAYERS;ALZHEIMERS-DISEASE;FIBRIL FORMATION;PRION PROTEIN;SECONDARY STRUCTURE;FORMING PEPTIDE;SHEET STRUCTURE
日期:	2010
上传时间:	2012-03-27 18:08:32 (UTC+8)
出版者:	國立中央大學
摘要:	The mechanisms of interfacial folding and membrane insertion of the Alzheimer's amyloid-beta fragment A beta(25-35) and its less toxic mutant, N27A-A beta(25-35) and more toxic mutant, M35A-A beta(25-35), are investigated using replica-exchange molecular dynamics in an implicit water-membrane environment. This study simulates the processes of interfacial folding and membrane insertion in a spontaneous fashion to identify their general mechanisms. A beta(25-35) and N27A-A beta(25-35) peptides share similar mechanisms: the peptides are first located in the membrane hydrophilic region where their C-terminal residues form helical structures. The peptides attempt to insert themselves into the membrane hydrophobic region using the C-terminal or central hydrophobic residues. A small portion of peptides can successfully enter the membrane's hydrophobic core, led by their C-terminal residues, through the formation of continuous helical structures. No detectable amount of M35A-A beta(25-35) peptides appeared to enter the membrane's hydrophobic core. The three studied peptides share a similar helical structure for their C-terminal five residues, and these residues mainly buried within the membrane's hydrophobic region. In contrast, their N-terminal properties are markedly different. With respect to the A beta(25-35), the N27A-A beta(25-35) forms a more structured helix and is buried deeper within the membrane, which may result in a lower degree of aggregation and a lower neurotoxicity; in contrast, the less structured and more water-exposed M35A-A beta(25-35) is prone to aggregation and has a higher neurotoxicity. Understanding the mechanisms of A beta peptide interfacial folding and membrane insertion will provide new insights into the mechanisms of neurodegradation and may give structure-based clues for rational drug design preventing amyloid associated diseases.
關聯:	PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS
显示于类别:	[化學學系] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	395	检视/开启

在NCUIR中所有的数据项都受到原著作权保护.

社群 sharing

数据加载中.....