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G Alibert1, R Ranjeva

  • 1Enzymologie et Métabolisme, Equipe de Recherche associée au CNRS Centre de Physiologie Végétale, Université Paul Sabatier, 118, route de Narbonne, 31-, Toulouse, France

FEBS Letters
|November 15, 1971
PubMed
Summary

Enzymes like phenylalanine ammonia-lyase (PAL) and hydroxylases involved in benzoic acid formation were identified in oak roots. Their interactions within the plant organ were characterized for the first time.

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Area of Science:

  • Plant biochemistry
  • Enzymology
  • Metabolic pathways

Background:

  • Oak (Quercus pedunculata) roots are a source of various plant secondary metabolites.
  • Understanding the enzymatic machinery in plant roots is crucial for metabolic studies.

Purpose of the Study:

  • To identify key enzymes involved in benzoic acid biosynthesis in Quercus pedunculata roots.
  • To characterize a novel enzyme system responsible for benzoic acid formation from cinnamic acid.
  • To discuss the roles and interactions of these enzymes within the root organ.

Main Methods:

  • Enzyme assays using cell-free extracts from Quercus pedunculata roots.
  • Characterization of enzyme kinetics and substrate specificity.
  • Analysis of enzyme interactions and their contribution to metabolic pathways.

Main Results:

  • The presence of phenylalanine ammonia-lyase (PAL), cinnamate-hydroxylase, and p-coumarate-hydroxylase was confirmed in cell-free root extracts.
  • A novel enzyme system catalyzing the formation of benzoic acid from cinnamic acid was characterized.
  • Evidence for the interaction of these enzymes within the root tissue was observed.

Conclusions:

  • The identified enzymes play a significant role in the biosynthesis of benzoic acid in Quercus pedunculata roots.
  • The characterization of this enzyme system provides new insights into plant metabolic pathways.
  • Further research is warranted to fully elucidate the complex enzymatic interactions in oak root metabolism.

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