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Functionalization of a Rigid Divalent Ligand for LecA, a Bacterial Adhesion Lectin.

Ou Fu1, Aliaksei V Pukin1, H C Quarles van Ufford1

  • 1Department of Medicinal Chemistry and Chemical Biology, Utrecht University P.O. Box 80082, 3508 TB, Utrecht, The Netherlands.

Chemistryopen
|October 20, 2015
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Summary

Researchers modified bacterial lectin LecA inhibitors by altering the spacer. While new compounds showed good binding, potency did not improve, though thermodynamic changes were observed.

Keywords:
LecA inhibitionbacterial lectinscarbohydratesmolecular modelingmultivalencyvirulence factors

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Area of Science:

  • Microbiology
  • Biochemistry
  • Medicinal Chemistry

Background:

  • Bacterial adhesion lectin LecA from *Pseudomonas aeruginosa* is a key target for inhibiting infections.
  • Previous divalent galactoside ligands with glucose-triazole spacers demonstrated significant inhibitory potential.
  • Modifying these ligands may lead to more effective anti-infective agents.

Purpose of the Study:

  • To synthesize novel LecA inhibitor derivatives by introducing various substituents into the spacer region.
  • To investigate if these modifications enhance the inhibitory potency against LecA.
  • To explore potential new interactions between modified spacers and the LecA protein.

Main Methods:

  • Synthesis of new divalent galactoside ligands with modified glucose-triazole spacers.
  • Evaluation of LecA binding affinity and inhibitory activity.
  • Isothermal titration calorimetry (ITC) to analyze thermodynamic binding parameters.

Main Results:

  • Successfully synthesized derivatives with positively charged, negatively charged, and lipophilic functional groups in the spacer.
  • The new compounds exhibited good binding to LecA, acting as effective ligands.
  • No significant improvement in LecA inhibitory potency was observed compared to previous compounds, despite altered thermodynamic profiles.

Conclusions:

  • Modification of the spacer in LecA inhibitors, while yielding good ligands, did not enhance inhibitory potency.
  • Altered thermodynamic parameters suggest changes in binding mechanisms despite lack of increased potency.
  • Further research is needed to optimize LecA inhibitors for improved anti-infective therapies.