PuSH - Publikationsserver des Helmholtz Zentrums München: Multi-targeting macrocyclic peptides as nanomolar inhibitors of self- and cross-seeded amyloid self-assembly of α-synuclein.

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Hornung, S.* ; Vogl, D.P.* ; Naltsas, D.* ; Dalla Volta, B.* ; Ballmann, M.* ; Marcon, B.* ; Syed, M.M.K.* ; Wu, Y.* ; Spanopoulou, A.* ; Feederle, R. ; Heidrich, L.* ; Bernhagen, J.* ; Koeglsperger, T.* ; Höglinger, G.U.* ; Rammes, G.* ; Lashuel, H.A.* ; Kapurniotu, A.*

Multi-targeting macrocyclic peptides as nanomolar inhibitors of self- and cross-seeded amyloid self-assembly of α-synuclein.

Angew. Chem.-Int. Edit.:e202422834 (2025)

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Amyloid self-assembly of α-synuclein (αSyn) is linked to the pathogenesis of Parkinson's disease (PD). Type 2 diabetes (T2D) has recently emerged as a risk factor for PD. Cross-interactions between their amyloidogenic proteins may act as molecular links. In fact, fibrils of islet amyloid polypeptide (IAPP) (T2D) can cross-seed αSyn amyloidogenesis and αSyn and IAPP colocalize in PD brains. Inhibition of both self- and IAPP-cross-seeded αSyn amyloidogenesis could thus interfere with PD pathogenesis. Here we show that macrocyclic peptides, designed to mimic IAPP self-/cross-interaction sites and previously found to inhibit amyloidogenesis of IAPP and/or Alzheimer's disease (AD) amyloid-β peptide Aβ40(42), are nanomolar inhibitors of both self- and IAPP-cross-seeded amyloid self-assembly of αSyn. Anti-amyloid function is mediated by nanomolar affinity interactions with αSyn via three αSyn regions which are identified as key sites of both αSyn self-assembly and its cross-interactions with IAPP. We also show that the peptides block Aβ42-mediated cross-seeding of αSyn as well. Based on their broad spectrum anti-amyloid function and additional drug-like features, these peptides are leads for multifunctional anti-amyloid drugs in PD, T2D, AD, and their comorbidities, while the identified αSyn key segments are valuable targets for novel, multi-site targeting amyloid inhibitors in PD and related synucleinopathies.

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