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Kaori Furukawa1, Makoto Oba, Kotomi Toyama

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We created cyclic α,α-disubstituted α-amino acids (dAAs) to control peptide structures. Acidic treatment of these peptides caused significant changes in their shape, stabilizing helical formations.

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Area of Science:

  • Peptide chemistry
  • Organic chemistry
  • Structural biology

Background:

  • Controlling peptide secondary structures is crucial for designing functional peptides.
  • Cyclic amino acids offer unique conformational properties.
  • Acetal-based side chains present opportunities for chemical modification.

Purpose of the Study:

  • To develop a novel method for controlling peptide secondary structures.
  • To investigate the impact of cyclic α,α-disubstituted α-amino acids (dAAs) with acetal-side chains on peptide conformation.
  • To explore the responsiveness of these modified peptides to acidic conditions.

Main Methods:

  • Synthesis of cyclic α,α-disubstituted α-amino acids (dAAs) featuring an acetal-side chain.
  • Incorporation of these modified dAAs into peptide sequences.
  • Analysis of peptide secondary structures using spectroscopic techniques (e.g., CD spectroscopy).
  • Induction of conformational changes via acidic treatment.

Main Results:

  • The incorporation of cyclic dAAs stabilized specific peptide secondary structures, notably helices.
  • Acidic treatment triggered a significant and observable conformational transition in the modified peptides.
  • The acetal-side chain proved instrumental in mediating the conformational control and response.

Conclusions:

  • Cyclic dAAs with acetal-side chains provide a powerful tool for designing peptides with controllable secondary structures.
  • These modified peptides exhibit conformational plasticity, responding predictably to chemical stimuli like acid.
  • This methodology opens avenues for developing peptides with tunable functions for various applications.