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Controlling Megasynthetase Module-Module Interactions through β-Hairpin Docking Domain Engineering.

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Bacteria use modular pathways like polyketide synthase (PKS) and nonribosomal peptide synthetase (NRPS) to create natural products. Docking domains (DD) ensure pathway fidelity, and this study explores engineering these DDs for natural product drug discovery.

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Area of Science:

  • Biochemistry
  • Synthetic Biology
  • Natural Product Biosynthesis

Background:

  • Bacteria synthesize valuable natural products using modular polyketide synthase (PKS) and nonribosomal peptide synthetase (NRPS) pathways.
  • Carrier domains (CP) and docking domains (DD) are crucial for pathway fidelity by directing intermediates between modules.

Purpose of the Study:

  • To investigate the engineering potential of docking domains (DDs) for controlling natural product biosynthesis.
  • To quantify the affinity and catalytic throughput of natural and engineered DDs in PKS/NRPS pathways.

Main Methods:

  • Examined the Vat system and carmabin pathway's short linear motif (SLiM)-β-hairpin domain (βHD) docks.
  • Quantitated binding affinity (Kd) and catalytic throughput of engineered DDs.
  • Assessed the correlation between DD affinity and catalytic success.

Main Results:

  • The SLiM-βHD dock was the primary determinant of binding affinity (Kd ~ 1 μM) for natural and engineered partners.
  • Engineered DD affinity predicted catalytic success in most, but not all, tested cases.
  • Other factors beyond DD affinity influence catalytic throughput in engineered pathways.

Conclusions:

  • Docking domains are key determinants of affinity and selectivity in PKS/NRPS pathways.
  • Engineering DDs offers potential for natural product diversification but faces challenges.
  • Understanding DD interactions is vital for improving synthetic biology approaches to natural product drug discovery.