Abstract
By introducing an additional hydrogen bond to hydrogen bond interaction in the force field of the CSAW (Conditioned Self-Avoiding Walk) model, we investigate into the mechanism of antiparallel β-sheet formation based on the folding of a short polyalanine in gas phase. Through our numerical simulation, we detect the possible presence of a transient helix during β-sheet formation, whose presence is shown to have slowed the formation of β-sheets by an order of magnitude. While we observe the mechanisms of nucleation, zipping and induction that drives the formation of a β-sheet, we uncover a new mechanism that involves transient β-turns and short β-sheets during the formation of long β-sheets. Our results have enabled us to provide an overview on the mechanisms of β-sheet formation via two main folding pathways: slow folding through the intermediate state of transient helix, and fast folding from the nucleation of β-turn.
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Goh, B.C., Leong, H.W., Qu, X. et al. The mechanism of antiparallel β-sheet formation based on conditioned self-avoiding walk. Eur. Phys. J. E 35, 27 (2012). https://doi.org/10.1140/epje/i2012-12027-8
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DOI: https://doi.org/10.1140/epje/i2012-12027-8