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Structural plasticity of helical nanotubes based on coiled-coil assemblies.

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Small changes in peptide sequences dramatically alter self-assembled nanotube structures. This research offers insights into evolutionary changes and synthetic peptide design.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Materials Science

Background:

  • Protein quaternary structures can evolve significantly with conserved sequences.
  • The evolutionary pathways for such structural divergence remain largely unknown.
  • Understanding these pathways is crucial for de novo design of peptide assemblies.

Purpose of the Study:

  • To investigate how minor sequence modifications impact self-assembled peptide structures.
  • To provide a model system for understanding evolutionary supramolecular structural changes.
  • To explore the potential for de novo design of synthetic peptide assemblies.

Main Methods:

  • Design of two synthetic 29-residue alpha-helical peptides.
  • Spontaneous self-assembly into helical nanotubes in vitro.
  • Near-atomic resolution analysis using electron cryomicroscopy with direct electron detection.

Main Results:

  • Conservative changes in one or two amino acids induced significant quaternary structure alterations.
  • Peptide assemblies demonstrated switchable behavior between two distinct forms.
  • Near-atomic resolution revealed detailed structural changes.

Conclusions:

  • Minor sequence variations can lead to substantial changes in supramolecular structure.
  • This system serves as a framework for studying evolutionary structural divergence.
  • Findings have implications for the de novo design of functional synthetic peptide assemblies.