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Sequence-Specific β-Peptide Synthesis by a Rotaxane-Based Molecular Machine.

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This study introduces an artificial molecular machine for synthesizing β-homo (β3) peptides using nonproteinogenic amino acids. The machine successfully operates via native chemical ligation, creating novel peptides not producible by natural or artificial means alone.

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Area of Science:

  • Molecular Machines
  • Synthetic Chemistry
  • Biotechnology

Background:

  • Ribosomes typically synthesize peptides using proteinogenic amino acids.
  • Nonproteinogenic amino acids, such as β3-amino acids, are challenging for ribosomal synthesis, especially consecutively.
  • Artificial molecular machines offer novel pathways for peptide synthesis.

Purpose of the Study:

  • To report the synthesis and operation of a rotaxane-based artificial molecular machine.
  • To demonstrate sequence-specific synthesis of β-homo (β3) peptides.
  • To explore the capability of artificial machines in handling challenging ligation transition states.

Main Methods:

  • Synthesis of a three-barrier, rotaxane-based artificial molecular machine.
  • Utilizing nonproteinogenic β3-amino acids for peptide synthesis.
  • Employing native chemical ligation (NCL) for peptide bond formation.
  • Demonstrating the removal of the catalyst region by peptidases.

Main Results:

  • Successful synthesis and operation of the artificial molecular machine.
  • Sequence-specific synthesis of β-homo (β3) peptides.
  • Demonstration of successful ligation for 15- and 19-membered transition states.
  • Generation of a unique peptide product through the combined action of artificial and biological machines.

Conclusions:

  • Artificial molecular machines can perform sequence-specific synthesis of β-homo (β3) peptides.
  • Challenging ligation transition states are compatible with information translation by this artificial machine.
  • The integration of artificial and biological machines enables the creation of peptides unattainable by either system independently.