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Engineering fructan metabolism in plants.

Tita Ritsema1, Sjef C M Smeekens

  • 1Molecular Plant Physiology, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands. t.ritsema@bio.uu.nl

Journal of Plant Physiology
|August 28, 2003
PubMed
Summary

Fructans are plant storage carbohydrates with health benefits. Understanding fructosyltransferase enzymes is key to engineering crops for high-level production of specific, commercially viable fructan molecules.

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Area of Science:

  • Plant biochemistry and crop engineering.
  • Carbohydrate metabolism and storage.
  • Enzymology of glycosidic bond synthesis.

Background:

  • Fructans, or polyfructosylsucroses, are vital storage carbohydrates in numerous plant species.
  • These compounds are recognized for their beneficial properties as food ingredients.
  • Efficient production of specific fructan structures in crops is a significant research objective.

Purpose of the Study:

  • To elucidate the properties of fructosyltransferases for targeted fructan synthesis.
  • To understand the enzymatic mechanisms underlying fructan biosynthesis.
  • To facilitate the engineering of crops for enhanced fructan production.

Main Methods:

  • Investigating the enzymatic activities of fructosyltransferases.
  • Analyzing the substrate specificity and glycosidic bond formation.
  • Studying the sequential action of enzymes in fructan elongation.

Main Results:

  • Fructan synthesis requires at least two distinct fructosyltransferases.
  • One enzyme produces the trisaccharide 1-kestose, serving as a primer.
  • Subsequent enzymes elongate and modify 1-kestose, yielding diverse fructan structures.

Conclusions:

  • Fructosyltransferase specificity dictates the diversity of synthesized fructans.
  • Understanding these enzymes is crucial for directing fructan biosynthesis.
  • Crop production of fructans in plants like sugar beet and potato enables commercial applications.

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