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Plectasin: from evolution to truncation, expression, and better druggability.

Xuan Li1,2,3, Ya Hao1,2,3, Na Yang1,2,3

  • 1Gene Engineering Laboratory, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China.

Frontiers in Microbiology
|January 8, 2024
PubMed
Summary
This summary is machine-generated.

Researchers engineered a novel antimicrobial peptide, Ple-AB, by truncating plectasin. This peptide shows strong bactericidal activity against Staphylococcus aureus and improved druggability, offering a promising new antimicrobial agent.

Keywords:
druggabilityevolutionexpressionplectasintruncation

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Area of Science:

  • Microbiology
  • Biotechnology
  • Drug Discovery

Background:

  • Antimicrobial resistance is a growing global health crisis, necessitating the development of novel therapeutic agents.
  • Staphylococcus aureus poses a significant threat due to its zoonotic nature and increasing resistance to conventional antibiotics.
  • Plectasin and its analogs are antimicrobial peptides with potential therapeutic applications.

Purpose of the Study:

  • To analyze the evolution of anti-Staphylococcus functional sequences.
  • To design and express novel plectasin derivatives with enhanced druggability.
  • To evaluate the antibacterial activity, stability, and safety of the lead candidate, Ple-AB.

Main Methods:

  • Classical evolution analysis of plectasin functional sequences.
  • Truncation design and recombinant expression of plectasin derivatives in Pichia pastoris.
  • High-density fermentation for protein production.
  • Determination of minimum inhibitory concentration (MIC) and assessment of stability under various conditions (temperature, pH).
  • Evaluation of druggability, including trypsin resistance and stability in simulated intestinal fluid.
  • In vitro safety assessments (hemolytic activity, cytotoxicity).

Main Results:

  • Successfully engineered Ple-AB, a plectasin derivative, with high expression levels (2.9 g/L) in Pichia pastoris.
  • Ple-AB demonstrated potent bactericidal activity against gram-positive bacteria (MIC: 2–16 μg/mL).
  • The peptide exhibited excellent stability across a range of temperatures and pH conditions.
  • Ple-AB showed enhanced druggability, including significant trypsin resistance and stability in simulated intestinal fluid.
  • In vitro safety tests indicated low hemolytic and cytotoxic effects.

Conclusions:

  • Truncation design is an effective strategy for enhancing the druggability of antimicrobial peptides.
  • The novel antimicrobial peptide Ple-AB exhibits promising antibacterial properties, stability, and druggability.
  • Ple-AB represents a potential novel therapeutic agent for combating Staphylococcus aureus infections, suitable for oral administration.