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Peptide Scanning-assisted Identification of a Monoclonal Antibody-recognized Linear B-cell Epitope
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Novel Anti-Microbial Peptides Design and Screening Against the KatG Using Molecular Docking and MD Simulation.

Kanchan Mehta1, Shama Mujawar2, Gaurav Kumar3

  • 1Department of Bioinformatics, Lovely Professional University, Phagwara, Punjab, India.

Probiotics and Antimicrobial Proteins
|June 19, 2026
PubMed
Summary

Researchers designed novel antimicrobial peptides by modifying LL-37 to target the Mycobacterium tuberculosis enzyme KatG, a key factor in drug resistance. Three peptides showed strong binding and stability, offering potential new treatments for multidrug-resistant tuberculosis.

Keywords:
Antimicrobial peptidesDrug resistanceKatGMolecular dockingMolecular dynamic simulationTuberculosis

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Drug Discovery

Background:

  • Tuberculosis (TB) remains a global health challenge, exacerbated by drug-resistant strains.
  • The Mycobacterium tuberculosis (Mtb) enzyme catalase-peroxidase G (KatG) is essential for isoniazid activation and bacterial defense, making it a critical target for combating resistance.
  • Mutations in KatG are a primary cause of isoniazid resistance, driving the development of multidrug-resistant TB.

Purpose of the Study:

  • To design novel antimicrobial peptides (AMPs) targeting the Mtb KatG enzyme.
  • To enhance the efficacy of the host-defense peptide LL-37 against M. tuberculosis through rational modifications.
  • To identify potent and safe peptide candidates for novel anti-TB therapeutic strategies.

Main Methods:

  • A library of 15 modified LL-37 peptides was designed and categorized.
  • In silico methods including molecular docking and 100 ns molecular dynamic (MD) simulations were employed.
  • Peptide structures were predicted and docked against the KatG active site.
  • Safety assessments evaluated toxicity, allergenicity, and ADME properties.

Main Results:

  • Three top-ranking peptides (P3, A5ζ, A4η) exhibited strong binding affinities to the KatG active site, with binding scores of -235.28, -229.42, and -233.81, respectively.
  • MD simulations confirmed the conformational stability of these complexes, with peptide P3 demonstrating exceptional stability.
  • Safety assessments indicated that the designed peptides possess favorable physicochemical and ADME properties, with no observed toxicity or allergenicity.

Conclusions:

  • Computationally designed AMPs (P3, A5ζ, A4η) show significant binding affinity to Mtb KatG.
  • These peptides have the potential to disrupt essential mycobacterial enzymatic functions.
  • The identified peptides represent promising candidates for developing new therapeutic strategies against drug-resistant tuberculosis.