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The study reveals that the leaving group on aminoacyl phosphates significantly influences peptide bond formation and self-assembly. Varying leaving groups control reactivity, supramolecular structure, and sequence selectivity in aqueous environments.

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Area of Science:

  • Biochemistry
  • Supramolecular Chemistry
  • Chemical Biology

Background:

  • Phosphate esters and anhydrides are crucial for biological energy transfer.
  • Acyl phosphates are highly reactive, typically activated via aminoacyl adenylates.
  • Alternative leaving groups for acyl phosphates remain largely unexplored regarding their impact on reactivity and structure.

Purpose of the Study:

  • To investigate how varied phosphate leaving groups influence peptide bond formation and self-assembly in water.
  • To explore the role of leaving group structure in directing supramolecular organization and reactivity.
  • To understand how leaving groups transform aminoacyl phosphates into active design elements for sequence selectivity.

Main Methods:

  • Synthesis of aminoacyl phosphate esters with diverse leaving groups (ethyl, phenyl, naphthyl, dodecyl).
  • Characterization of peptide bond formation and self-assembly in aqueous solutions.
  • Analysis of supramolecular architectures and mechanical properties of resulting assemblies.
  • Investigation of phosphoryl exchange dynamics in soluble versus self-assembling phosphates.

Main Results:

  • Leaving group structure dictates distinct pathways for peptide bond formation and self-assembly.
  • Preorganization into aggregates and coassembly with peptides are guided by leaving group features.
  • Leaving groups determine peptide yields, supramolecular architectures, and mechanical properties.
  • Aminoacyl phosphates act as recognition elements, driving sequence selectivity through microenvironments.
  • Self-assembling phosphates resist exchange and promote amino acid oligomerization, unlike soluble counterparts.

Conclusions:

  • The leaving group is a tunable element that governs aminoacyl phosphate reactivity and pathway dynamics.
  • Leaving groups actively direct supramolecular organization, assembly, and recognition processes.
  • This work transforms activation chemistry from a simple synthetic step into a driver of complex biological outcomes.