A de novo designed 11 kDa polypeptide: Model for amyloidogenic intrinsically disordered proteins |
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| Authors: | Natalya I Topilina Vladimir V Ermolenkov Vitali Sikirzhytski Seiichiro Higashiya Igor K Lednev John T Welch |
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| Institution: | Department of Chemistry, University at Albany, State University of New York, Albany, NY 12222 |
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| Abstract: | A de novo polypeptide GH6(GA)3GY(GA)3GE]8GAH6 (YE8) has a significant number of identical weakly interacting β‐strands with the turns and termini functionalized by charged amino acids to control polypeptide folding and aggregation. YE8 exists in a soluble, disordered form at neutral pH but is responsive to changes in pH and ionic strength. The evolution of YE8 secondary structure has been successfully quantified during all stages of polypeptide fibrillation by deep UV resonance Raman (DUVRR) spectroscopy combined with other morphological, structural, spectral, and tinctorial characterization. The YE8 folding kinetics at pH 3.5 are strongly dependent on polypeptide concentration with a lag phase that can be eliminated by seeding with a solution of folded fibrillar YE8. The lag phase of polypeptide folding is concentration dependent leading to the conclusion that β‐sheet folding of the 11‐kDa amyloidogenic polypeptide is completely aggregation driven. © 2010 Wiley Periodicals, Inc. Biopolymers 93: 607–618, 2010. This article was originally published online as an accepted preprint. The “Published Online” date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com |
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| Keywords: | model repetitive polypeptide intrinsically disordered protein Raman spectroscopy protein folding and aggregation amyloid fibril |
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