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Macrocyclic β-Sheets Stabilized by Hydrogen Bond Surrogates.

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This summary is machine-generated.

Researchers created minimal protein beta-sheet mimics using hydrogen bond surrogates. These turn-less macrocycles demonstrate robust beta-sheet formation, with aromatic interactions providing superior stability for biomolecular interaction inhibitors.

Keywords:
Constrained PeptidesMacrocyclesProtein MimicsProtein-Protein-Interactionsβ-Sheets

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Medicinal Chemistry

Background:

  • Protein secondary structures like beta-sheets are crucial for biomolecular interactions.
  • Mimicking protein structures offers a route to rationally designed inhibitors.
  • Existing beta-sheet mimics often rely on synthetic or natural turn segments.

Purpose of the Study:

  • To develop conformationally-defined, turn-less macrocyclic beta-sheet mimics.
  • To investigate the use of hydrogen bond surrogates (HBS) to replace terminal inter-beta-strand hydrogen bonds.
  • To create minimal mimics of protein beta-sheets.

Main Methods:

  • Developed a facile solid-phase synthesis protocol for turn-less antiparallel beta-sheet mimics.
  • Conducted a bioinformatics survey of protein beta-sheets to identify common interstrand side chain interactions.
  • Utilized circular dichroism, NMR spectroscopy, and X-ray crystallography for structural and conformational analysis.

Main Results:

  • Identified an over-abundance of aromatic-aromatic, cation-π, and ionic interactions in natural beta-sheets.
  • Demonstrated that minimal HBS mimics exhibit robust beta-sheet formation with specific amino acid residue pairings.
  • Found that aromatic interactions confer superior conformational stability in isolated beta-sheets compared to ionic or cation-π interactions.

Conclusions:

  • Turn-less macrocyclic beta-sheet mimics can be successfully synthesized using HBS.
  • Specific amino acid residue pairings, particularly aromatic ones, are critical for stable beta-sheet mimic formation.
  • These findings support the design principles for minimal beta-sheet mimics as potential inhibitors of biomolecular interactions.