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Inhibitors against Fungal Cell Wall Remodeling Enzymes.

Ignacio Delso1, Jessika Valero-Gonzalez2, Fernando Gomollón-Bel1

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Researchers designed novel carbohydrate derivatives targeting fungal glucanosyltransferases, essential enzymes in pathogenic fungi. The lead compound effectively inhibits Aspergillus fumigatus Gel4, offering a potential new avenue for antifungal drug development.

Keywords:
Aspergillus fumigatuscarbohydratesglycomimeticsoligosaccharidestransglycosylases

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Area of Science:

  • Biochemistry and Medicinal Chemistry
  • Mycology and Fungal Pathogenesis

Background:

  • Fungal β-1,3-glucan glucanosyltransferases are crucial for cell wall integrity and fungal viability.
  • These enzymes are potential drug targets for treating fungal infections, but specific inhibitors are lacking.

Purpose of the Study:

  • To develop novel inhibitors for fungal glucan-remodeling enzymes using a structure-guided design approach.
  • To identify compounds with high affinity for Aspergillus fumigatus Gel4, a key glucanosyltransferase.

Main Methods:

  • Employed a multidisciplinary strategy, including structure-guided design based on a conserved transglycosylase from Saccharomyces cerevisiae.
  • Utilized X-ray crystallography to confirm compound binding within the active site of Aspergillus fumigatus Gas2/Gel4.
  • Performed topological analysis of noncovalent interactions to understand binding modes.

Main Results:

  • Developed carbohydrate derivatives with high affinity for Aspergillus fumigatus Gel4.
  • Confirmed that the designed compounds bind to the active site and interact with the catalytic machinery of Gas2/Gel4.
  • Identified that a combination of triazole and positively charged aromatic moieties facilitates optimal binding via pyridinium cation-π and π-π interactions.
  • The lead compound demonstrated potent inhibition of AfGel4 with an IC50 value of 42 µM.

Conclusions:

  • The study successfully designed and validated carbohydrate derivatives as potent inhibitors of fungal β-1,3-glucan glucanosyltransferases.
  • The findings provide a structural basis for understanding inhibitor interactions with fungal enzymes.
  • These inhibitors represent promising candidates for the development of new antifungal therapies.