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Docking Domain Engineering in a Modular Polyketide Synthase and Its Impact on Structure and Function.

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Protein engineering of modular polyketide synthases (PKSs) using docking domains like SYNZIP and SpyCatcher:SpyTag offers new ways to produce chemicals. However, module rigidity impacts efficiency, which can be improved by adding flexible hinge regions.

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Area of Science:

  • Biochemistry
  • Protein Engineering
  • Synthetic Biology

Background:

  • Modular polyketide synthases (PKSs) are complex enzymatic machinery.
  • Engineering PKSs enables the biosynthesis of valuable chemicals and pharmaceuticals.
  • Controlling PKS module assembly is key for directed biosynthesis.

Purpose of the Study:

  • To investigate the use of protein-protein interaction domains as tools for assembling PKS modules.
  • To evaluate the impact of rigid docking domains on the efficiency of venemycin biosynthesis.
  • To establish a split venemycin synthase system for PKS engineering.

Main Methods:

  • Analysis of SYNZIP domains and the SpyCatcher:SpyTag complex for coupling PKS polypeptides (VemG and VemH).
  • Construction of a three-polypeptide split venemycin synthase.
  • Assessment of synthesis rates and efficiency at varying protein concentrations and with engineered hinge regions.

Main Results:

  • High-affinity interactions via SYNZIP and SpyCatcher:SpyTag facilitate module coupling, beneficial at low protein concentrations.
  • Rigidity and steric hindrance from these domains can reduce enzymatic synthesis rates.
  • Incorporating a flexible hinge region distant from the rigid interface successfully restored synthesis efficiency.

Conclusions:

  • The conformational flexibility of modular PKSs must be considered in protein engineering strategies.
  • SYNZIP and SpyCatcher:SpyTag are viable but rigid tools for PKS module assembly.
  • A split venemycin synthase system provides a versatile platform for analyzing and engineering modular PKSs.