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Related Experiment Videos

Marked increase in ascorbate oxidase protein in pumpkin callus by adding copper.

M Esaka1, M Uchida, H Fukui

  • 1Faculty of Applied Biological Science, Hiroshima University, Saijo, Higashi-Hiroshima, 724 Japan.

Plant Physiology
|November 1, 1988
PubMed
Summary

Ascorbate oxidase, an enzyme from pumpkin, was purified and characterized. Copper significantly increased ascorbate oxidase protein levels in pumpkin callus, suggesting copper induces its synthesis or stabilizes the enzyme.

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Area of Science:

  • Biochemistry
  • Plant Science

Background:

  • Ascorbate oxidase is a key enzyme in plant metabolism.
  • Understanding its regulation is crucial for plant physiology.

Purpose of the Study:

  • To purify and characterize ascorbate oxidase from pumpkin (Cucurbita sp.).
  • To investigate the effect of copper on ascorbate oxidase levels in pumpkin callus.

Main Methods:

  • Enzyme purification using standard biochemical techniques.
  • Sodium dodecylsulfate-polyacrylamide gel electrophoresis (SDS-PAGE) for molecular weight determination.
  • Double immunodiffusion and immunological blotting for protein detection and comparison.
  • Single radial immunodiffusion for quantifying enzyme protein levels.

Main Results:

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  • Purified ascorbate oxidase consists of a single polypeptide subunit with a molecular weight of 64,000.
  • The enzyme is immunologically identical in pumpkin fruit and callus.
  • Ascorbate oxidase activity and protein levels increase during callus growth.
  • Copper supplementation (10 µM CuSO(4)) increased enzyme protein approximately eightfold compared to lower copper levels (0.1 µM CuSO(4)).

Conclusions:

  • Copper is a critical factor in regulating ascorbate oxidase synthesis or stability in pumpkin callus.
  • Copper may act as an inducer for ascorbate oxidase production or enhance its resistance to degradation.