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Structural basis for intermodular communication in assembly-line polyketide biosynthesis.

Dillon P Cogan1,2, Alexander M Soohoo3, Muyuan Chen4

  • 1Department of Chemistry, Stanford University, Stanford, CA, USA. dcogan@usc.edu.

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Summary
This summary is machine-generated.

Assembly-line polyketide synthases (PKSs) are modular enzymes. Researchers studied their domain interactions using crosslinking and cryo-EM to understand intermediate transport for PKS engineering.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Synthetic Biology

Background:

  • Assembly-line polyketide synthases (PKSs) are complex multi-enzyme systems responsible for producing a diverse array of natural products.
  • Understanding the precise mechanisms of substrate channeling and domain communication within PKSs is crucial for their rational engineering.
  • Genetic reprogramming of PKSs offers significant potential for creating novel compounds with tailored structures.

Purpose of the Study:

  • To investigate the functional interactions between catalytic domains and acyl carrier protein (ACP) domains in PKSs.
  • To elucidate the structural basis for selective substrate transport along the PKS assembly line.
  • To provide insights for the structure-based design of hybrid PKS systems.

Main Methods:

  • Utilized a bifunctional crosslinking reagent to capture transient domain-domain interfaces within the 6-deoxyerythronolide B synthase.
  • Employed single-particle cryogenic electron microscopy (cryo-EM) to resolve the structures of crosslinked PKS intermediates.
  • Applied statistical per-particle image analysis to analyze cryo-EM data and identify key interactions.

Main Results:

  • Uncovered specific interactions between ketosynthase (KS) and ACP domains.
  • Demonstrated that these interactions discriminate between intra-modular and inter-modular communication pathways.
  • Reinforced the importance of conformational asymmetry in the PKS catalytic cycle.

Conclusions:

  • The study provides a structural foundation for understanding PKS intermediate transport.
  • Identified key domain-domain interactions that govern substrate channeling within PKS assembly lines.
  • Findings support the rational design of hybrid PKSs by combining modules from different PKS systems.