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• W1988620274 endingPage "489" @default.
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• W1988620274 abstract "A 23-residue peptide termed BH(9-10) was designed based on a beta-hairpin segment of the single-layer beta-sheet region of Borrelia OspA protein. The peptide contains a large number of charged amino acid residues, and it does not follow the amphipathic pattern that is commonly found in natural beta-sheets. In aqueous solution, the peptide was highly soluble and flexible, with a propensity to form a non-native beta-turn. Trifluoroethanol (TFE) stabilized a native-like beta-turn in BH(9-10). TFE also decreased the level of solubility of the peptide, resulting in peptide precipitation. The precipitation process accompanied a conformational conversion to a beta-sheet structure, as judged with circular dichroism spectroscopy. The precipitate was found to be fibrils similar to those associated with human amyloid diseases. The fibrillization kinetics depended on peptide and TFE concentrations, and had a nucleation step followed by an assembly step. The fibrillization was reversible, and the dissociation reaction involved two phases. TFE appears to induce the fibrils by stabilizing a beta-sheet conformation of the peptide that optimally satisfies hydrogen bonding and electrostatic complementarity. This TFE-induced fibrillization is quite unusual, because most amyloidogenic peptides form fibrils in aqueous solution and TFE disrupts these fibrils. Nevertheless, the BH(9-10) fibrils have similar structure to other fibrils, supporting the emerging idea that polypeptides possess an intrinsic ability to form amyloid-like fibrils. The high level of solubility of BH(9-10), the ability to precisely control fibril formation and dissociation, and the high-resolution structure of the same sequence in the beta-hairpin conformation in the OspA protein provide a tractable experimental system for studying the fibril formation mechanism." @default.
• W1988620274 created "2016-06-24" @default.
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• W1988620274 creator A5071333092 @default.
• W1988620274 creator A5079756189 @default.
• W1988620274 date "2000-08-01" @default.
• W1988620274 modified "2023-09-26" @default.
• W1988620274 title "Solution conformation and amyloid-like fibril formation of a polar peptide derived from a β-hairpin in the OspA single-layer β-sheet 1 1Edited by P. Wright" @default.
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• W1988620274 doi "https://doi.org/10.1006/jmbi.2000.3980" @default.
• W1988620274 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10926522" @default.
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