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Related Experiment Video

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Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
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Minimalist Prion-Inspired Polar Self-Assembling Peptides.

Marta Díaz-Caballero1, Susanna Navarro1, Isabel Fuentes2

  • 1Institut de Biotecnologia i de Biomedicina and Departament de Bioquímica i Biologia Molecular , Universitat Autònoma de Barcelona , 08193 Bellaterra, Barcelona , Spain.

ACS Nano
|May 30, 2018
PubMed
Summary

Researchers designed minimalist peptides mimicking prion domains (PrDs) to create novel amyloid nanostructures. These self-assembling peptides offer a scalable alternative for advanced biomaterials and nanotechnology applications.

Keywords:
amyloid fibrilslow complexity sequencesnanomaterials.prion domainself-assemblyshort peptides

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Supramolecular Chemistry

Background:

  • Amyloid structures, derived from self-assembling supramolecular nanofibers, have significant applications in biomedicine and nanotechnology.
  • Prions are proteins capable of switching between soluble and amyloid states, a property governed by prion domains (PrDs).
  • PrDs are disordered, low-complexity regions rich in polar amino acids, enabling slow, kinetically controlled amyloid formation.

Purpose of the Study:

  • To design and synthesize minimalist peptides inspired by prion domains (PrDs) for creating novel amyloid nanostructures.
  • To explore the self-assembly properties and potential applications of these synthetic peptides as building blocks for advanced materials.
  • To investigate the utility of tyrosine residues in these peptides for creating cross-linked assemblies and functional scaffolds.

Main Methods:

  • Design of four minimalist polar binary patterned peptides (NYNYNYN, QYQYQYQ, SYSYSYS, GYGYGYG) based on PrD motifs.
  • Characterization of self-assembly into amyloid structures under physiological conditions.
  • Exploitation of tyrosine residues for dityrosine cross-linking and immobilization of metal nanoparticles.

Main Results:

  • The designed minimalist peptides self-assemble into nontoxic amyloids, recapitulating properties of full-length PrDs.
  • Tyr residues enabled the formation of stable dityrosine cross-linked assemblies for nanoparticle immobilization and electrocatalytic scaffolds.
  • Shorter hexapeptides (NYNNYN, QYQQYQ, SYSSYS) also formed amyloid-like structures, confirming the relevance of tandem motifs.

Conclusions:

  • Minimalist peptides inspired by prion domains serve as effective, small building blocks for constructing tailored prion-like nanostructures.
  • These synthetic amyloids offer a scalable and affordable alternative to full-length PrDs for materials science applications.
  • The developed dityrosine cross-linked assemblies demonstrate potential for advanced applications in nanoparticle immobilization and catalysis.