Self-assembly dynamics and antimicrobial activity of all l- and d-amino acid enantiomers of a designer peptide

Nanoscale. 2018 Dec 20;11(1):266-275. doi: 10.1039/c8nr07334a.

Abstract

Recent studies have shown that antimicrobial peptides (AMPs) can self-assemble into supramolecular structures, but this has been overlooked as causative of their antimicrobial activity. Also, the higher antimicrobial potency of d-enantiomers compared to l-enantiomers of AMPs cannot always be attributed to their different resistance to protease degradation. Here, we tested all l- and d-amino acid versions of GL13K, an AMP derived from a human protein, to study structural links between the AMP secondary structure, supramolecular self-assembly dynamics, and antimicrobial activity. pH dependence and the evolution of secondary structures were related to a self-assembly process with differences among these AMPs. The two GL13K enantiomers formed analogous self-assembled twisted nanoribbon structures, but d-GL13K initiated self-assembly faster and had notably higher antimicrobial potency than l-GL13K. A non-antimicrobial scrambled amino acid version of l-GL13K assembled at a much higher pH to form distinctively different self-assembled structures than l-GL13K. Our results support a functional relationship between the AMP self-assembly and their antimicrobial activity.

MeSH terms

  • Amino Acids / chemistry*
  • Antimicrobial Cationic Peptides / chemistry*
  • Circular Dichroism
  • Humans
  • Hydrogen-Ion Concentration
  • Macromolecular Substances
  • Molecular Conformation
  • Oligopeptides / chemistry*
  • Peptides / chemistry*
  • Protein Structure, Secondary*
  • Stereoisomerism

Substances

  • Amino Acids
  • Antimicrobial Cationic Peptides
  • GL13K
  • Macromolecular Substances
  • Oligopeptides
  • Peptides