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Proline and Glycine Control Protein Self-Organization into Elastomeric or Amyloid Fibrils

Abstract : Elastin provides extensible tissues, including arteries and skin, with the propensity for elastic recoil, whereas amyloid fibrils are associated with tissue-degenerative diseases, such as Alzheimer’s. Although both elastin-like and amyloid-like materials result from the self-organization of proteins into fibrils, the molecular basis of their differing physical properties is poorly understood. Using molecular simulations of monomeric and aggregated states, we demonstrate that elastin- like and amyloid-like peptides are separable on the basis of backbone hydration and peptide-peptide hydrogen bonding. The analysis of diverse sequences, including those of elastin, amyloids, spider silks, wheat gluten, and insect resilin, reveals a threshold in proline and glycine composition above which amyloid formation is impeded and elastomeric properties become apparent. The predictive capacity of this threshold is confirmed by the self-assembly of recombinant peptides into either amyloid or elastin-like fibrils. Our findings support a unified model of protein aggregation in which hydration and conformational disorder are fundamental requirements for elastomeric function.
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https://hal.univ-reims.fr/hal-03541833
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Submitted on : Monday, January 24, 2022 - 10:41:25 PM
Last modification on : Tuesday, January 25, 2022 - 12:26:28 AM

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Sarah Rauscher, Stéphanie Baud, Ming Miao, Fred w. Keeley, Régis Pomès. Proline and Glycine Control Protein Self-Organization into Elastomeric or Amyloid Fibrils. Structure, Elsevier (Cell Press), 2006, 14 (11), pp.1667-1676. ⟨10.1016/j.str.2006.09.008⟩. ⟨hal-03541833⟩

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