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Measurement of Chitinase Activity in Biological Samples
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Plant root associated chitinases: structures and functions.

Samuel O Shobade1,2, Olga A Zabotina1,2, Marit Nilsen-Hamilton1,2

  • 1Ames National Laboratory, U. S. Department of Energy, Ames, IA, United States.

Frontiers in Plant Science
|February 16, 2024
PubMed
Summary
This summary is machine-generated.

Plant and bacterial chitinases were characterized for their roles in the rhizosphere. Plant chitinases are involved in defense against fungal pathogens, while both may aid nutrient recycling.

Keywords:
C-terminal domainanti-fungal activitychitin-binding domainchitinasehydrolasesrhizosphere

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Area of Science:

  • Biochemistry
  • Plant Science
  • Microbiology

Background:

  • Chitinases degrade chitin, a key component of fungal cell walls and arthropod exoskeletons.
  • These enzymes are secreted into the rhizosphere, a critical zone for plant-microbe nutrient exchange.
  • Understanding chitinase function is vital for elucidating plant-microbe interactions.

Purpose of the Study:

  • To model, express, purify, and characterize root chitinases from Zea mays (ZmChi19A) and Oryza sativa (OsChi19A), and a bacterial chitinase (CspCh18A) from Chitinophaga oryzae.
  • To determine the enzymes' activities against various substrates and Aspergillus niger.
  • To identify the roles of specific protein domains (CBD, C-terminal domain) in enzyme function and fungal growth inhibition.

Main Methods:

  • Enzyme expression, purification, and characterization.
  • Kinetic analysis using 4-MU-GlcNAc3 substrate.
  • pH and temperature optimum determination.
  • Structural modeling and site-directed mutagenesis of ZmChi19A.
  • Enzyme activity assays with Aspergillus niger.

Main Results:

  • ZmChi19A and OsChi19A belong to the GH19 family; CspCh18A belongs to the GH18 family.
  • All three enzymes exhibited similar apparent Km values for 4-MU-GlcNAc3.
  • Enzymes displayed distinct pH and temperature optima.
  • The C-terminal domain was crucial for activity on soluble substrates, while both CBD and C-terminal domains were vital for inhibiting fungal growth.

Conclusions:

  • Plant chitinases (ZmChi19A, OsChi19A) likely function in plant defense against chitin-bearing pathogens.
  • Bacterial chitinase (CspCh18A) and plant chitinases may contribute to nutrient cycling in the rhizosphere.
  • Structural domains play differential roles in substrate cleavage and fungal growth inhibition, highlighting complex functional adaptations.