Antimicrobial activity and stability of the d -amino acid substituted derivatives of antimicrobial peptide polybia -MPI

Antimicrobial peptide has the potential to be developed as new kind of antimicrobial agents with novel action mechanism. However, the susceptibility to protease is a drawback for potential peptides to be clinical used. d -amino acid substitution can be one way to increase the proteolytic stability of peptides. In the present study, we synthesized the d -lysines substituted analog ( d -lys-MPI) and the d -enantiomer of polybia -MPI (D-MPI) to improve the proteolytic resistance of polybia -MPI. Our results showed that, the stability of its d -amino acid partially substituted analog d -lys-MPI was increased. However, it lost antimicrobial activity at the tested concentration with the loss of α-helix content. As shown in the CD spectra, after substitution, the spectra of D-MPI is symmetrical to MPI, indicated it turned into left hand α-helical conformation. Excitingly, the stability of D-MPI toward the tested protease was improved greatly. Notably, the antimicrobial activity of D-MPI was comparable to its L-counterpart MPI, even improved. In addition, the hemolytic activity of D-MPI was lowered. This also indicated that the action target of antimicrobial peptide polybia -MPI was not chiral specific. So, D-MPI may offer a therapeutic strategy to defend the infection of microbes, considering its stability to protease and relatively lower cytotoxicity to human erythrocytes.