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Related Experiment Videos

Microsomal phosphatidate phosphatase in maturing safflower seeds.

K Ichihara1, S Norikura, S Fujii

  • 1Department of Agricultural Chemistry, Kyoto Prefectural University, Shimogamo, Kyoto 606, Japan.

Plant Physiology
|June 1, 1989
PubMed
Summary

A new assay accurately measures phosphatidate phosphatase activity in safflower seeds. This enzyme is crucial for triacylglycerol synthesis but doesn't limit oil accumulation during seed maturation.

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Area of Science:

  • Biochemistry
  • Plant Physiology
  • Seed Development

Background:

  • Triacylglycerol synthesis is vital for energy storage in developing seeds.
  • Phosphatidate phosphatase (PAP) is a key enzyme in the lipid biosynthesis pathway.
  • Understanding PAP activity in oilseeds like safflower is crucial for crop improvement.

Purpose of the Study:

  • To develop a reliable assay for phosphatidate phosphatase activity.
  • To characterize the properties of PAP in maturing safflower seeds.
  • To determine the role of PAP in triacylglycerol accumulation.

Main Methods:

  • Developed a reproducible assay using sodium phosphatidate, phosphatidylcholine, and bovine serum albumin.
  • Measured PAP activity in membrane and soluble fractions of safflower seeds.

Related Experiment Videos

  • Characterized enzyme kinetics, including optimal pH, Mg(2+) dependence, and substrate specificity.

    • Main Results:

    • Established an assay for phosphatidate phosphatase activity in safflower (Carthamus tinctorius L.) seeds.
    • Microsomal PAP exhibited optimal activity at pH 6.7 and required Mg(2+).
    • The enzyme showed high specificity for phosphatidate and sufficient activity to support in vivo triacylglycerol synthesis.

    Conclusions:

    • Phosphatidate phosphatase activity is present and characterized in maturing safflower seeds.
    • The enzyme's activity is sufficient for observed triacylglycerol accumulation rates.
    • Diacylglycerol formation by PAP is likely not the rate-limiting step in seed oil synthesis.