Molecular modeling of the Aβ1-42 peptide from Alzheimer's disease

被引:81
作者
Chaney, MO
Webster, SD
Kuo, YM
Roher, AE [1 ]
机构
[1] Sun Hlth Res Inst, Haldeman Lab Alzheimer Dis Res, Sun City, AZ 85351 USA
[2] Eli Lilly & Co, Lilly Res Labs, Biotechnol Core, Indianapolis, IN 46285 USA
[3] Univ Calif Irvine, Dept Mol Biol & Biochem, Irvine, CA 92717 USA
来源
PROTEIN ENGINEERING | 1998年 / 11卷 / 09期
关键词
A beta peptide; Alzheimer's disease; molecular modeling;
D O I
10.1093/protein/11.9.761
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The three-dimensional structure of the Alzheimer's disease A beta 1-42 peptide was predicted by sequence homology, threading approaches and by experimental observations. The A beta molecule displayed a Greek key moth with four antiparallel beta-strands. To shield thermodynamically unfavorable domains, two A beta molecules interact with each other to generate a beta-barrel structure with a hydrophilic surface and a hydrophobic core. The N-terminal domains of the dimer form crevices into which the non-polar C-termini are accommodated to yield a globular structure 27X32 Angstrom in diameter. Alternatively, the C-terminal domains of two opposing dimers could be extended to form an antiparallel beta-sheet, The stacking of these building blocks generates a helical protofilament. To create a thermodynamically more favorable structure, three protofilaments associate into a right-handed triple helix with a hydrophobic beta-sheet completely surrounded by the hydrophilic beta-barrels made of residues 1-28. Two triple helical strands can further associate into a right-handed amyloid filament. Although our model did not meet all the expected criteria, it nevertheless exhibited a series of naturally disposed structural features, revealed by other biophysical studies utilizing synthetic A beta peptides, These characteristics are of functional significance in terms of A beta-topology, fibril formation and cytotoxicity, The model also suggests that A beta may not exist in a thermodynamically stable conformation, but rather as an ensemble of metastable dimeric structures some of which are capable of generating an extended C-terminal antiparallel beta-sheet essential in the promotion of fibrillogenesis.
引用
收藏
页码:761 / 767
页数:7
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