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Crosslinking intermodular condensation in non-ribosomal peptide biosynthesis.

Graham W Heberlig1, James J La Clair1, Michael D Burkart2

  • 1Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA, USA.

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Researchers developed novel crosslinking probes to study non-ribosomal peptide synthetases (NRPS). These probes captured key interactions, revealing the structural dynamics of these complex enzyme assembly lines for therapeutic drug production.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • Non-ribosomal peptide synthetases (NRPS) are large megasynthase enzymes crucial for producing therapeutic drugs.
  • Their complex, dynamic, multi-domain architecture poses significant challenges for structural characterization.
  • Understanding NRPS function requires detailed insights into inter-domain and inter-modular interactions.

Purpose of the Study:

  • To develop and apply novel crosslinking probes for conformational constraint of NRPS.
  • To resolve the dynamic interactions between peptidyl carrier proteins and enzymatic domains within NRPS.
  • To elucidate the structural basis of substrate translocation and catalytic progression in NRPS.

Main Methods:

  • Development of site-selective crosslinking probes.
  • Application of tetrazine click chemistry for in situ crosslinking.
  • High-resolution cryo-electron microscopy (cryo-EM) and X-ray crystallography.

Main Results:

  • Captured the condensation of two carrier protein substrates within the tyrocidine synthetase active site.
  • Determined the high-resolution cryo-EM structure of this crosslinked complex.
  • Obtained X-ray crystal structure of a carrier protein crosslinked to its epimerization domain.
  • Highlighted intermodular recognition events and defined carrier protein processive movement.

Conclusions:

  • Structural insights into NRPS intermodular recognition and carrier protein dynamics were achieved.
  • The study provides a framework for understanding the molecular mechanisms of NRPS assembly lines.
  • These findings are critical for future synthetic biology applications and rational design of NRPS-based pathways.