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Antibiotic Selection00:57

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Bibacillin 1: a two-component lantibiotic from Bacillus thuringiensis.

Ryan Moreira1, Yi Yang1, Youran Luo1

  • 1Department of Chemistry and Howard Hughes Medical Institute, University of Illinois at Urbana-Champaign Urbana IL 61822 USA vddonk@illinois.edu +1 217 244 5360.

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Summary

Bibacillin 1, a novel two-component lantibiotic from Bacillus thuringiensis, exhibits potent bactericidal activity against Gram-positive bacteria, including ESKAPE pathogens. Its unique lipid II-independent mechanism and quorum sensing involvement distinguish it from other lantibiotics.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Molecular Biology

Background:

  • Lantibiotics are ribosomally synthesized and post-translationally modified peptides with antimicrobial properties.
  • Two-component lantibiotics, like bibacillin 1, involve multiple peptides that act synergistically.
  • Bacillus thuringiensis is a well-known entomopathogenic bacterium with a diverse range of secondary metabolites.

Purpose of the Study:

  • To characterize bibacillin 1, a novel two-component lantibiotic from Bacillus thuringiensis.
  • To elucidate the mechanism of action and cooperative activity of bibacillin 1.
  • To investigate the potential role of bibacillin 1 in bacterial communication and its relationship with virulence factors.

Main Methods:

  • Isolation and purification of bibacillin 1 components from Bacillus thuringiensis.
  • Stereochemical analysis to determine the presence of modified amino acids (lanthionine and methyllanthionine).
  • Bactericidal and hemolytic activity assays against various bacterial strains and erythrocytes.
  • Mechanism of action studies, including lipid II-binding assays.
  • Quorum sensing analysis through cross-reactivity assays.

Main Results:

  • Bibacillin 1 consists of two peptides produced by the class II lanthipeptide synthetase Bib1M.
  • Both peptides contain ll-methyllanthionine and dl-lanthionine, with non-overlapping ring patterns.
  • Bibacillin 1 displayed cooperative bactericidal activity against Gram-positive bacteria, including ESKAPE pathogens, with weak hemolytic activity.
  • Optimal activity was observed at a 1:1 ratio, but significant activity persisted at skewed ratios, suggesting complementary targets.
  • The mechanism of action is lipid II-independent, differentiating it from haloduracin and lacticin 3147.
  • One component showed cross-reactivity with the enterococcal cytolysin (CylLS'') regulatory system.

Conclusions:

  • Bibacillin 1 is a novel two-component lantibiotic with potent antimicrobial activity against significant human pathogens.
  • Its lipid II-independent killing mechanism and potential involvement in quorum sensing offer new insights into lantibiotic function.
  • The findings raise questions about the ecological role of CylLS''-like natural products and their impact on lantibiotic expression.