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DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers
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A helical, aromatic, peptide nanotube.

Marco Crisma1, Claudio Toniolo, Soledad Royo

  • 1Department of Organic Chemistry, ICMA, University of Zaragoza-CSIC, 50009 Zaragoza, Spain. marco.crisma@unipd.it

Organic Letters
|December 15, 2006
PubMed
Summary

Terminally protected dipeptides self-assemble into hollow helical channels via hydrogen bonds. These unique peptide nanotubes, formed from cyclopropane phenylalanine analogues, can encapsulate guest molecules.

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Area of Science:

  • Supramolecular chemistry
  • Organic chemistry
  • Crystal engineering

Background:

  • Peptide self-assembly is a key strategy for creating ordered nanostructures.
  • Previous peptide nanotubes often lack large internal channels.
  • Cyclopropane amino acid analogues offer unique conformational constraints.

Purpose of the Study:

  • To investigate the self-assembly of a novel terminally protected dipeptide.
  • To characterize the resulting supramolecular structure and its potential for guest inclusion.
  • To explore the role of cyclopropane phenylalanine analogues in directing self-assembly.

Main Methods:

  • X-ray crystallography to determine the solid-state structure.
  • Analysis of intermolecular hydrogen bonding patterns.

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  • Characterization of the helical channel dimensions and internal environment.

    • Main Results:

    • The dipeptide Boc-(S,S)c3diPhe-(R,R)c3diPhe-NHiPr self-assembles into a large-diameter (18 Å) supramolecular helix.
    • A hollow helical channel is formed, internally decorated with phenyl rings.
    • This structure differs significantly from previously reported peptide nanotubes.
    • The cyclopropane phenylalanine analogue imparts unique conformational properties influencing assembly.

    Conclusions:

    • Terminally protected dipeptides containing cyclopropane phenylalanine analogues can form novel peptide nanotubes with internal channels.
    • The observed helical structure is driven by intermolecular hydrogen bonds.
    • These peptide nanotubes show potential for molecular encapsulation applications.