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Protein phosphorylation in pea root plastids.

K M Lukaszewski1, C G Bowsher, P J Savory

  • 1School of Biological Sciences, 3.614 Stopford Building, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K.

Plant & Cell Physiology
|June 28, 2001
PubMed
Summary
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Pea root plastids phosphorylate three stromal proteins, including a potential phosphoglucomutase intermediate. Protein phosphorylation is magnesium-sensitive and influenced by metabolic intermediates, suggesting a regulatory role.

Area of Science:

  • Plant cell biology
  • Biochemistry

Background:

  • Protein phosphorylation is a key regulatory mechanism in cellular processes.
  • Non-photosynthetic plastids, like those in pea roots, perform diverse metabolic functions.
  • Understanding protein phosphorylation in plastids can reveal novel regulatory pathways.

Purpose of the Study:

  • To investigate protein phosphorylation in non-photosynthetic pea root plastids.
  • To identify phosphorylated proteins and characterize the involved enzymes.
  • To explore the metabolic regulation of protein phosphorylation in these organelles.

Main Methods:

  • Incubation of intact and lysed pea root plastids with [gamma-(32)P]ATP.
  • Analysis of protein phosphorylation using SDS-PAGE and autoradiography.

Related Experiment Videos

  • Enzyme assays to characterize protein kinase and phosphatase activities.
  • Investigation of the effects of metabolic intermediates on protein phosphorylation.

    • Main Results:

    • Three stromal proteins (41, 58, and 62 kDa) were phosphorylated on serine residues.
    • The 62 kDa protein is likely phosphoglucomutase, a catalytic intermediate.
    • Kinase and phosphatase activities were magnesium-dependent but calcium-independent.
    • Metabolic intermediates, including glucose 6-phosphate, inhibited 58 kDa protein phosphorylation.

    Conclusions:

    • Protein phosphorylation occurs in non-photosynthetic pea root plastids.
    • Specific metabolic pathways and ions regulate this phosphorylation.
    • These findings suggest a role for protein phosphorylation in plastid function and regulation.