期刊
JOURNAL OF CHEMICAL PHYSICS
卷 130, 期 14, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3108461
关键词
aggregation; amorphous state; biochemistry; molecular biophysics; molecular configurations; nematic liquid crystals; phase diagrams; proteins
资金
- NSF [0642086]
- California Nanosystem Institute [CHE-0321368]
- Div Of Molecular and Cellular Bioscience
- Direct For Biological Sciences [0642086] Funding Source: National Science Foundation
The effect of beta-sheet propensity on the structural features of peptide aggregates was investigated using an off-lattice coarse-grained peptide model. A phase diagram as a function of temperature and beta-sheet propensity reveals a diverse family of supramolecular assemblies. Highly rigid peptides (peptides with high beta-sheet propensity) are seen to assemble predominantly into fibrillar structures. Increasing the flexibility of the peptide (reducing beta-sheet propensity) leads to a variety of structures, including fibrils, beta-barrel structures, and amorphous aggregates. Nonfibrillar entities have been suggested as primary causative agents in amyloid diseases and our simulations indicate that mutations that decrease beta-sheet propensity will decrease fibril formation and favor the formation of such toxic oligomers. Parallels between beta-sheet aggregates and nematic liquid crystals are discussed.
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