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Purified recombinant phage lysin LySMP: an extensive spectrum of lytic activity for swine streptococci

Y Wang1, J H Sun, C P Lu

  • 1Department of Animal Science, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China. wy34201591@126.com

Current Microbiology
|March 10, 2009
PubMed

Insights

A novel bacteriophage lysin, LySMP, shows broad antimicrobial activity against Streptococcus suis strains, offering a potential solution for antibiotic resistance. This finding highlights LySMP as a promising candidate for controlling swine bacterial infections.

Area of Science:

  • Microbiology
  • Biotechnology
  • Veterinary Medicine

Background:

  • Antibiotic resistance is a growing global concern, necessitating alternative antimicrobial strategies.
  • Bacteriophage lysins are enzymes with potential as antimicrobial agents due to their specific lytic activity.
  • Streptococcus suis is a significant pathogen in swine, causing considerable economic losses.

Purpose of the Study:

  • To characterize the lytic activity of a novel bacteriophage lysin, LySMP, derived from Streptococcus suis bacteriophage SMP.
  • To evaluate LySMP's efficacy against various bacterial strains, including different serotypes of S. suis.
  • To determine the optimal conditions for LySMP activity and its potential as a therapeutic agent.

Main Methods:

  • Recombinant expression and purification of LySMP in Escherichia coli.
  • Determination of the lytic spectrum of LySMP against a panel of bacterial pathogens.
  • Optimization of pH and temperature for LySMP activity using turbidity reduction assays.
  • Assessment of LySMP's degradation efficiency on bacterial cell walls.

Main Results:

  • LySMP demonstrated broad lytic activity against S. suis serotypes 2, 7, and 9, as well as Streptococcus equi ssp. zooepidemicus and Staphylococcus aureus.
  • LySMP showed limited activity against E. coli and Salmonella enterica.
  • Optimal lysis activity was observed at 37°C and pH 5.2, with turbidity reduction ranging from 1.2% to 68% within 30 minutes.
  • LySMP exhibited higher degradation efficiency on pre-treated bacterial cells.

Conclusions:

  • The bacteriophage lysin LySMP possesses significant antimicrobial properties against key S. suis strains.
  • LySMP's specific lytic activity and effectiveness under optimal conditions suggest its potential as a novel antimicrobial agent.
  • LySMP represents a promising candidate for the development of new strategies to combat S. suis infections in swine, addressing antibiotic resistance concerns.

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