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Related Experiment Videos

Cucumber seedling indoleacetaldehyde oxidase.

P J Bower1, H M Brown, W K Purves

  • 1Biochemistry and Biophysics Section, Biological Sciences Group, University of Connecticut, Storrs, Connecticut 06268.

Plant Physiology
|January 1, 1978
PubMed
Summary

Cucumber seedlings contain an enzyme that converts indole-3-acetaldehyde to indole-3-acetic acid, a key plant hormone. This metalloflavoprotein may be regulated by feedback inhibition from the plant hormone itself.

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Area of Science:

  • Plant Biochemistry
  • Enzymology
  • Hormone Metabolism

Background:

  • Plant growth and development are regulated by hormones like indole-3-acetic acid (IAA).
  • The biosynthesis and metabolism of IAA involve various enzymatic pathways in plants.
  • Cucumis sativus (cucumber) seedlings are a model for studying plant hormone metabolism.

Purpose of the Study:

  • To identify and characterize the enzyme responsible for oxidizing indole-3-acetaldehyde to indole-3-acetic acid in cucumber seedlings.
  • To investigate the enzyme's properties, substrate specificity, and potential regulation.

Main Methods:

  • Enzyme extraction and purification from light-grown Cucumis sativus L. seedlings.
  • Enzyme activity assays measuring the oxidation of indole-3-acetaldehyde.

Related Experiment Videos

  • Inhibitor studies using various aldehydes and 2,4-Dichlorophenoxyacetic acid.
  • Enzyme activation studies using heat treatment and mercaptoethanol.

    • Main Results:

    • Cucumber seedling extracts catalyzed the oxidation of indole-3-acetaldehyde to indole-3-acetic acid without added cofactors.
    • Inhibitor studies suggested the enzyme is a metalloflavoprotein and that indole-3-acetaldehyde is the primary substrate.
    • 2,4-Dichlorophenoxyacetic acid strongly inhibited the enzyme, suggesting potential feedback inhibition by indole-3-acetic acid in vivo.
    • The enzyme activity was enhanced by brief heating or mercaptoethanol treatment.

    Conclusions:

    • A novel indole-3-acetaldehyde oxidase has been identified in Cucumis sativus L. seedlings.
    • This enzyme plays a significant role in indole-3-acetic acid biosynthesis or metabolism.
    • The enzyme's properties suggest it is a metalloflavoprotein potentially subject to feedback regulation by auxin.