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Hydrolysis01:15

Hydrolysis

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Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...
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Updated: Nov 8, 2025

Author Spotlight: Integrating Biochemical Functions of &#946;-Glucanases and Peroxidase Enzymes in Wheat-RWA Interaction
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Fructan-hydrolyzing activities from Lolium rigidum Gaudin.

G D Bonnett1, R J Simpson1

  • 1School of Agriculture and Forestry, The University of Melbourne, Parkville 3052, Australia.

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|April 20, 2021
PubMed
Summary

This study on Lolium rigidum found that fructan-hydrolyzing enzymes exhibit consistent activity across plant tissues, unlike sucrose-hydrolyzing enzymes. Understanding these fructanase activities is key for grass carbohydrate metabolism.

Keywords:
Fructan hydrolysisLolium rigidumfructan exohydrolaseinvertaseβ-fructofuranosidase

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Area of Science:

  • Plant biochemistry
  • Enzymology
  • Grassland science

Background:

  • Fructans are important non-structural carbohydrates in many grasses, serving as energy reserves.
  • Sucrose and fructan hydrolysis are critical metabolic processes in plants.
  • Lolium rigidum (rigid ryegrass) is a significant forage grass species.

Purpose of the Study:

  • To investigate and characterize the fructan- and sucrose-hydrolyzing activities in Lolium rigidum.
  • To determine the distribution and specificity of these enzymatic activities within the plant.
  • To identify and partially purify the β-fructofuranosidase enzymes responsible for these activities.

Main Methods:

  • Extraction of enzymatic activity from Lolium rigidum tissues.
  • Chromatographic techniques (e.g., ion-exchange, size-exclusion) for enzyme purification.
  • Assays measuring the hydrolysis rates of sucrose and various fructan substrates.

Main Results:

  • Sucrose-hydrolyzing activity showed significant variation (30-fold) across different plant parts and ages.
  • Fructan-hydrolyzing activity exhibited less variation (2-fold).
  • At least four distinct β-fructofuranosidase activities were identified, differing in substrate specificity and chromatographic behavior. Some preferentially hydrolyzed 2-1 linked fructans over 2-6 linked fructans. Certain fructan-specific β-fructofuranosidases were inhibited by sucrose.

Conclusions:

  • Fructan hydrolysis in Lolium rigidum involves multiple β-fructofuranosidase isoenzymes with distinct properties.
  • Enzyme activity and substrate preference are crucial factors in understanding fructan metabolism in grasses.
  • Appropriate selection of fructan substrates is necessary for accurate characterization of fructan-hydrolyzing enzymes.