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Reduction of a disulfide-constrained oligo-glutamate peptide triggers self-assembly of β2-type amyloid fibrils with the chiroptical properties determined by supramolecular chirality

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dc.abstract.enDisulfide bonds prevent aggregation of globular proteins by stabilizing the native state.However, a disulfide bond within a disordered state may accelerate amyloidogenic nucleation by navigating fluctuating polypeptide chains towards an orderly assembly of β-sheets. Here, the self-assembly behavior of Glu-Cys-(Glu)4-Cys-Glu peptide (E6C2), in which an intrachain disulfide bond is engineered into an amyloidogenic homopolypeptide motif, is investigated. To this end, the Thioflavin T (ThT) fluorescence kinetic assay is combinedwith infrared spectroscopy, circular dichroism (CD), atomic force microscopy (AFM) and Raman scattering measurements. Regardless of whether the disulfide bond is intact or reduced, E6C2 monomers remain disordered within a broad range of pH. On the other hand, only reduced E6C2 self-assembles into amyloid fibrilswith the unique infrared traits indicative of three-center hydrogen bonds involving main-chain carbonyl as a bifurcating acceptor and main-chain NH and side-chain –COOH groups as hydrogen donors: the bonding pattern observed in so-called β2-fibrils. AFManalysis of β2-E6C2 reveals tightly packed rectangular superstructureswhose presence coincides with strong chiroptical properties. Our findings suggest that formation of chiral amyloid superstructures may be a generic process accessible to various substrates, and that the fully extended conformation of a poly-Glu chain is a condition sine qua non for self-assembly of β2-fibrils.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorGuza, Marcin
dc.contributor.authorDzwolak, Wojciech
dc.contributor.authorDec, Robert
dc.date.accessioned2024-01-25T19:08:38Z
dc.date.available2024-01-25T19:08:38Z
dc.date.issued2020
dc.description.financePublikacja bezkosztowa
dc.description.volume162
dc.identifier.doi10.1016/J.IJBIOMAC.2020.06.221
dc.identifier.issn0141-8130
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/118116
dc.identifier.weblinkhttps://api.elsevier.com/content/article/PII:S0141813020336710?httpAccept=text/xml
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofInternational Journal of Biological Macromolecules
dc.relation.pages866-872
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enHomopolypeptides
dc.subject.enFibrils
dc.subject.enSuperstructures
dc.subject.enChirality
dc.subject.enIntrinsic disorder
dc.subject.enSelf-assembly
dc.titleReduction of a disulfide-constrained oligo-glutamate peptide triggers self-assembly of β2-type amyloid fibrils with the chiroptical properties determined by supramolecular chirality
dc.typeJournalArticle
dspace.entity.typePublication