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Structure-Guided Design and Development of Novel Cyclophilin A Inhibitors and Ganoderiol-F Derivatives: An In-Silico Approach
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Structural basis for binding specificity between subclasses of modular polyketide synthase docking domains.

Tonia J Buchholz1, Todd W Geders, Frank E Bartley

  • 1Life Sciences Institute, Department of Medicinal Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA.

ACS Chemical Biology
|January 17, 2009
PubMed
Summary
This summary is machine-generated.

Bacterial polyketide synthases (PKSs) use docking domains for molecular recognition. This study reveals how these domains ensure precise assembly of valuable natural products, like pikromycin and erythromycin.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Natural Product Synthesis

Background:

  • Bacterial type I polyketide synthases (PKSs) are large enzyme complexes responsible for synthesizing diverse natural products with clinical applications.
  • Assembly of polyketides involves processive synthesis within these complexes, requiring efficient transfer of intermediates.
  • N- and C-terminal docking domains are crucial for mediating the transfer of acyl intermediates across interpolypeptide junctions.

Purpose of the Study:

  • To comprehensively analyze the binding affinity and selectivity of all discrete docking domain pairs within the pikromycin and erythromycin PKS systems.
  • To elucidate the structural basis of molecular recognition mediated by these docking domains.

Main Methods:

  • Binding affinity and selectivity assays for complete sets of docking domain pairs.
  • X-ray crystallography to determine the structure of the PikAIII/PikAIV docking domain interface.

Main Results:

  • Each cognate pair of docking domains demonstrated exquisite binding selectivity, even when disconnected from their parent modules.
  • X-ray crystallography revealed key interacting residues at the PikAIII/PikAIV interface.
  • These findings enabled the development of a structural model for the H2-T2 class of polypeptides involved in PKS intermodular recognition.

Conclusions:

  • Docking domains play a critical role in ensuring the fidelity of polyketide synthesis by maintaining high binding selectivity.
  • Structural insights into docking domain interactions provide a foundation for understanding PKS assembly and engineering novel compounds.