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Tertiary Butanol Induced Amyloidogenesis of Hen Egg White Lysozyme (HEWL) Is Facilitated by Aggregation-Prone Alkali-Induced Molten Globule Like Conformational State

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Proteins may form undesirable aggregates during the process of folding. Increasing evidence suggests that amyloid fibrils may arise from partially folded precursor molecules. We have previously demonstrated that hen egg white lysozyme [HEWL] exists as molten globule at pH 12.7. Here, we report that lysozyme at pH 7.0 and 11.0 are nearly stable to the addition of up to 45% t-butanol, but treatment of the alkali-induced molten globule form of HEWL [AMGL] with 20% t-butanol caused the formation of amyloid-like fibrils as evidenced by enhanced Thioflavin T binding and DLS measurements.

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Keywords: Hen egg white lysozyme; amyloid; dynamic light scattering; thioflavin binding

Document Type: Research Article

Publication date: 2009-01-01

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.
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