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• W2043282395 abstract "Human insulin, which consists of disulfide cross-linked A and B polypeptide chains, readily forms amyloid fibrils under slightly destabilizing conditions. We examined whether the isolated A and B chain peptides of human insulin would form fibrils at neutral and acidic pH. Although insulin exhibits a pH-dependent lag phase in fibrillation, the A chain formed fibrils without a lag at both pHs. In contrast, the B chain exhibited complex concentration-dependent fibrillation behavior at acidic pH. At higher concentrations, e.g., >0.2 mg/mL, the B chains preferentially and rapidly formed stable protofilaments rather than mature fibrils upon incubation at 37 °C. Surprisingly, these protofilaments did not convert into mature fibrils. At lower B chain concentrations, however, mature fibrils were formed. The explanation for the concentration dependence of B chain fibrillation is as follows. The B chains exist as soluble oligomers at acidic pH, have a β-sheet rich conformation as determined by CD, and bind ANS strongly, and these oligomers rapidly form dead-end protofilaments. However, under conditions in which the B chain monomer is present, such as low B chain concentration (<0.2 mg/mL) or in the presence of low concentrations of GuHCl, which dissociates the soluble oligomers, mature fibrils were formed. Thus, both A and B chain peptides can form amyloid fibrils, and both are likely to be involved in the interactions leading to the fibrillation of intact insulin." @default.
• W2043282395 created "2016-06-24" @default.
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• W2043282395 date "2006-07-11" @default.
• W2043282395 modified "2023-09-24" @default.
• W2043282395 title "Fibrillation of Human Insulin A and B Chains" @default.
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• W2043282395 doi "https://doi.org/10.1021/bi0604936" @default.
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