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Related Experiment Videos

eEF1A isoforms change in abundance and actin-binding activity during maize endosperm development.

Jose A Lopez-Valenzuela1, Bryan C Gibbon, Peter A Hughes

  • 1Department of Plant Sciences, University of Arizona, Tucson, Arizona 85721, USA.

Plant Physiology
|October 4, 2003
PubMed
Summary

Maize opaque2 mutants show increased eukaryotic elongation factor 1A (eEF1A) synthesis, correlating with lysine content. Isoforms of eEF1A exhibit distinct actin-binding but similar tRNA-binding activities.

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Area of Science:

  • Plant molecular biology
  • Protein biochemistry
  • Maize genetics

Background:

  • Eukaryotic elongation factor 1A (eEF1A) is a multifunctional protein involved in protein synthesis.
  • In maize (Zea mays) endosperm, eEF1A synthesis increases in opaque2 (o2) mutants, correlating with lysine content.

Purpose of the Study:

  • To investigate the relationship between eEF1A isoforms and lysine content in maize endosperm.
  • To characterize the functional and structural properties of purified eEF1A isoforms.

Main Methods:

  • Purification of eEF1A isoforms from developing maize endosperm.
  • In vitro assays to assess F-actin and aminoacyl-tRNA binding activities.
  • Tandem mass spectrometry to analyze protein composition and post-translational modifications.

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Main Results:

  • Three eEF1A isoforms were identified, developmentally regulated and largely independent of the o2 mutation.
  • Isoforms displayed differential F-actin binding, indicating functional divergence.
  • All isoforms showed similar aminoacyl-tRNA binding capabilities.
  • Mass spectrometry revealed isoforms share gene products but differ in post-translational modifications (methylation, phosphorylation).

Conclusions:

  • Maize eEF1A isoforms are functionally distinct, particularly in actin binding, despite sharing core components and tRNA binding.
  • Post-translational modifications likely account for functional differences between eEF1A isoforms.
  • The precise chemical basis for differential actin-binding activity remains undetermined.