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Related Experiment Videos

Warm growth temperatures decrease soybean cholinephosphotransferase activity.

S H Cho1, T M Cheesbrough

  • 1U. S. Department of Agriculture, Agricultural Research Service, Northern Regional Research Center, Seed Biosynthesis Research Unit, Peoria, Illinois 61604.

Plant Physiology
|May 1, 1990
PubMed
Summary
This summary is machine-generated.

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Soybean seed development shows higher cytidine 5'-diphosphate (CDP) choline: 1,2-diacylglycerol cholinephosphotransferase activity at 20°C compared to 35°C. This difference is due to enzyme levels, not isozymes or effectors.

Area of Science:

  • Plant Biochemistry
  • Enzyme Kinetics
  • Seed Physiology

Background:

  • Soybean (Glycine max L. var Williams 82) seed development involves complex enzymatic processes.
  • Cytidine 5 -diphosphate (CDP) choline: 1,2-diacylglycerol cholinephosphotransferase (EC 2.7.8.2) is crucial for phospholipid biosynthesis.

Purpose of the Study:

  • To investigate the effect of temperature on the activity of CDP-choline: 1,2-diacylglycerol cholinephosphotransferase in developing soybean seeds.
  • To compare the characteristics of this enzyme when soybean cotyledons are cultured at different temperatures (20°C vs. 35°C).

Main Methods:

  • Enzyme activity assays were performed on soybean cotyledons cultured at 20°C and 35°C.
  • Enzyme kinetics were analyzed, including pH optimum, K(m) for CDP-choline, and optimal assay temperature.

Related Experiment Videos

  • The effects of divalent cations (Mg2+, Mn2+) and metabolic effectors were examined.

    • Main Results:

    • Enzyme activity was 3-5 times higher in cotyledons grown at 20°C compared to 35°C.
    • The enzyme exhibited a pH optimum of 7, a K(m) of 7.0 µM for CDP-choline, and an optimal assay temperature of 45°C at both temperatures.
    • Enzyme activity at 20°C is attributed to higher enzyme levels, with rapid turnover observed at 35°C.

    Conclusions:

    • Temperature significantly modulates CDP-choline: 1,2-diacylglycerol cholinephosphotransferase activity in developing soybean seeds.
    • The higher activity at lower temperatures is likely due to increased enzyme abundance rather than altered enzyme properties or metabolic regulation.
    • Enzyme turnover is temperature-dependent, suggesting a role in developmental plasticity.