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Isocitrate lyase: artifacts and multiple enzyme forms.

G Pinzauti, E Giachetti, P Vanni

    Archives of Biochemistry and Biophysics
    |August 1, 1983
    PubMed
    Summary
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    Protease action in vitro generates multiple isocitrate lyase enzyme forms in Pinus pinea seeds. A heat-stable form is observed early in germination, indicating developmental changes.

    Area of Science:

    • Biochemistry
    • Plant Physiology
    • Enzymology

    Background:

    • Multiple enzyme forms of isocitrate lyase (ICL) are commonly reported across various species.
    • Protease activity post-cell rupture has been suggested as a cause for these multiple enzyme forms.
    • Understanding ICL heterogeneity is crucial for plant metabolic studies.

    Purpose of the Study:

    • To investigate the potential role of protease action in generating multiple isocitrate lyase forms in Pinus pinea.
    • To characterize the different forms of isocitrate lyase during seed germination.
    • To examine the influence of germination stage and heat stability on ICL forms.

    Main Methods:

    • Enzyme extraction and purification from germinating Pinus pinea seeds.
    • Analysis of isocitrate lyase activity and forms using DEAE-Sephacel chromatography.

    Related Experiment Videos

  • Assessment of enzyme heat stability under different conditions.
  • Correlation of enzyme forms with seed germination age.

    • Main Results:

    • Evidence supports in vitro protease action contributing to multiple isocitrate lyase forms in Pinus pinea.
    • DEAE-Sephacel chromatography revealed changes in ICL patterns, particularly related to germination age.
    • Distinct differences in heat stability were observed among the detected isocitrate lyase forms.
    • At least three isocitrate lyase forms were identified, with one heat-stable form present only in early germination stages.

    Conclusions:

    • Protease activity in vitro is a significant factor in the observed multiplicity of isocitrate lyase forms in Pinus pinea.
    • Isocitrate lyase from Pinus pinea exhibits developmental regulation, with distinct forms appearing at different germination stages.
    • The presence of a heat-stable ICL form early in germination suggests specific physiological roles during this phase.