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Cholinesterases are a group of serine hydrolase enzymes that play a crucial role in the breakdown of choline esters. The two primary types of cholinesterases are acetylcholinesterases (AChEs) and butyrylcholinesterase (BuChEs), which differ in their distribution, function, and substrate specificity. AChEs, also known as true cholinesterases, specifically hydrolyze acetylcholine, while BuChEs, often referred to as pseudocholinesterases, can hydrolyze various choline esters, including...
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Measurement of Chitinase Activity in Biological Samples
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Fungal Chitin Synthases: Structure, Function, and Regulation.

Linda Brain1,2, Mark Bleackley2, Monika S Doblin1

  • 1Department of Ecological, Plant and Animal Science, La Trobe Institute for Sustainable Agriculture & Food (LISAF), AgriBio, Bundoora, VIC 3086, Australia.

Journal of Fungi (Basel, Switzerland)
|November 26, 2025
PubMed
Summary
This summary is machine-generated.

Chitin synthases are crucial for fungal cell walls but difficult to target. New structural data offers hope for developing effective antifungal drugs against diverse fungal pathogens.

Keywords:
CHScell wall inhibitorsfungal cell wallfungal chitin synthasespolysaccharide

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Area of Science:

  • Biochemistry
  • Mycology
  • Structural Biology

Background:

  • Chitin is a vital fungal cell wall component, making chitin synthases (CSs) attractive antifungal targets.
  • Existing CS inhibitors lack efficacy against key agricultural fungal pathogens like Aspergillus and Fusarium.
  • Multiple CS isoforms and stress-induced compensatory responses complicate antifungal development.

Purpose of the Study:

  • To review current understanding of fungal chitin biosynthesis.
  • To highlight challenges in chitin synthase biochemical characterization.
  • To explore how new structural data can guide antifungal drug discovery.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) structural determination of Class I chitin synthases.
  • Analysis of structural and mechanistic properties of fungal and oomycete chitin synthases.

Main Results:

  • Recent cryo-EM structures reveal conserved, domain-swapped homodimer architectures for chitin synthases.
  • Distinct substrate-binding and catalytic pockets were identified.
  • Sophisticated intrinsic regulatory mechanisms within chitin synthases were elucidated.

Conclusions:

  • Structural insights into chitin synthases are a significant breakthrough.
  • These findings provide a foundation for developing novel, broad-spectrum antifungal agents.
  • Further biochemical characterization is needed to fully leverage structural data for drug development.