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β-Lactam formation by a non-ribosomal peptide synthetase during antibiotic biosynthesis.

Nicole M Gaudelli1, Darcie H Long1, Craig A Townsend1

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Non-ribosomal peptide synthetases assemble peptides and form critical beta-lactam rings in nocardicin antibiotics. This novel mechanism differs from other beta-lactam pathways, offering new possibilities for engineered peptides.

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Area of Science:

  • Biochemistry
  • Natural Product Biosynthesis
  • Enzymology

Background:

  • Non-ribosomal peptide synthetases (NRPS) are large enzymes that synthesize diverse bioactive peptides.
  • Many natural products, including antibiotics like vancomycin and penicillin, are derived from NRPS.
  • Beta-lactam rings are crucial structural motifs in many antibiotics.

Purpose of the Study:

  • To investigate a novel NRPS activity involved in nocardicin antibiotic biosynthesis.
  • To elucidate the mechanism of beta-lactam ring formation by NRPS.
  • To explore potential applications of this NRPS activity in peptide engineering.

Main Methods:

  • Biochemical assays to study NRPS activity.
  • Enzymatic domain analysis.
  • Mechanistic studies and supporting experimental validation.

Main Results:

  • Discovery of an unprecedented NRPS activity that assembles a serine-containing peptide.
  • Identification of a histidine-rich condensation domain responsible for beta-lactam ring synthesis.
  • Elucidation of a novel mechanism for beta-lactam ring formation distinct from known pathways.

Conclusions:

  • A novel NRPS mechanism for beta-lactam ring formation in nocardicins has been identified.
  • This finding expands our understanding of NRPS capabilities and beta-lactam biosynthesis.
  • The discovered NRPS activity holds potential for engineering novel bioactive peptides and protease inhibitors.