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In vivo synthesis and processing of cereal lectins.

H M Stinissen1, W J Peumans, A R Carlier

  • 1Laboratorium voor Plantenbiochemie, Katholieke Universiteit Leuven, Kardinaal Mercierlaan, 92, B-3030, Heverlee, Belgium.

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Cereal lectin precursors are biologically active and are slowly converted to mature lectins. This processing may transport lectins into extra-cytoplasmic compartments, similar to other cellular proteins.

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Area of Science:

  • Molecular Biology
  • Plant Biochemistry
  • Cell Biology

Background:

  • Cereal lectins are proteins found in grains with known biological activities.
  • Understanding the synthesis and processing of these lectins is crucial for comprehending their function and localization within plant cells.

Purpose of the Study:

  • To investigate the in vivo synthesis and post-translational processing of cereal lectins.
  • To determine if precursor lectins possess biological activity.
  • To explore the potential mechanism of lectin transport into extra-cytoplasmic compartments.

Main Methods:

  • In vivo tracking of cereal lectin synthesis and processing.
  • Analysis of molecular weight changes during precursor to mature lectin conversion.
  • Assessment of sugar-binding activity in both precursor and mature lectin forms.

Main Results:

  • Cereal lectin genes initially produce higher molecular weight (28 K) precursors.
  • These precursors are converted to mature lectin polypeptides (23 K) via a slow, single-step post-translational process.
  • The precursor form exhibits sugar-binding activity, indicating it is biologically active before maturation.

Conclusions:

  • Cereal lectin precursor processing is a slow but not essential step for biological activity.
  • The processing mechanism shows similarities to vectorial processing of other cellular proteins.
  • Vectorial processing may facilitate the transport of cereal lectins into extra-cytoplasmic compartments.