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Engineering a Potent Anti-MRSA Agent: The Development and Characterization of Chimeric Endolysin ZAM-MSC.

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Engineered ZAM-MSC, a chimeric endolysin, effectively lyses Staphylococcus aureus, including resistant strains. This potent antibiotic alternative shows high stability and biocompatibility, offering a promising solution for challenging infections.

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EndolysinLysostaphinMethicillin-resistant Staphylococcus aureus

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Area of Science:

  • Biotechnology
  • Microbiology
  • Drug Discovery

Background:

  • Increasing prevalence of Staphylococcus aureus (S. aureus), particularly methicillin-resistant strains (MRSA), presents a significant healthcare challenge due to limited therapeutic options.
  • Development of novel antimicrobial agents is crucial to combat antibiotic resistance.
  • Endolysins, bacteriophage-derived enzymes, show potential as alternatives to conventional antibiotics.

Purpose of the Study:

  • To engineer and characterize a novel chimeric endolysin, ZAM-MSC, for enhanced antibacterial activity against S. aureus.
  • To evaluate the lytic activity, stability, and biocompatibility of the engineered endolysin.

Main Methods:

  • Domain-fusion strategy combining lysostaphin (M23 catalytic, SH3b cell wall-binding domains) and endolysin SAL-1 (CHAP catalytic domain) to create ZAM-MSC.
  • Protein expression in E. coli, purification, and characterization of lytic activity, thermal stability, and salt tolerance.
  • Computational structural optimization using AlphaFold2, AutoDock Vina, and GROMACS simulations.
  • Cytotoxicity assessment using MTT assays on L929 fibroblast cells and hemolysis assays on red blood cells.

Main Results:

  • Purified ZAM-MSC demonstrated potent lytic activity, reducing bacterial optical density within 15 minutes at a minimum concentration of 3 μg.
  • ZAM-MSC exhibited high thermal stability, retaining 80-90% enzymatic activity between 4-37 °C.
  • Optimal activity was observed in the absence of NaCl, with reduced activity at higher salt concentrations.
  • Cytotoxicity assays showed high cell viability (~85-90%) and nearly 100% red blood cell integrity, indicating excellent biocompatibility.

Conclusions:

  • The engineered chimeric endolysin ZAM-MSC exhibits potent antibacterial activity against S. aureus.
  • ZAM-MSC demonstrates favorable stability and biocompatibility profiles, making it a promising therapeutic candidate.
  • The combination of computational design and experimental validation provides a robust approach for developing novel antimicrobial agents.