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An evolutionarily conserved pseudokinase mediates stem cell production in plants.

Zachary L Nimchuk1, Paul T Tarr, Elliot M Meyerowitz

  • 1Division of Biology 156-29, California Institute of Technology, Pasadena, California 91125, USA.

The Plant Cell
|March 15, 2011
PubMed
Summary

The Arabidopsis protein CORYNE is not a kinase but a pseudokinase. This finding challenges previous assumptions about its role in plant signaling pathways.

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Area of Science:

  • Plant molecular biology
  • Protein biochemistry
  • Arabidopsis thaliana research

Background:

  • The CORYNE protein in Arabidopsis thaliana was previously characterized as a kinase.
  • It was believed to function as part of a receptor kinase complex in plant signaling.

Purpose of the Study:

  • To re-evaluate the enzymatic activity and function of the Arabidopsis CORYNE protein.
  • To determine if CORYNE is indeed a functional kinase or a pseudokinase.

Main Methods:

  • Comparative sequence analysis of CORYNE and known kinases.
  • Biochemical assays to test for kinase activity.
  • Mutant studies in transgenic Arabidopsis plants to assess in vivo function.

Main Results:

  • Sequence comparisons suggest CORYNE lacks key catalytic residues of kinases.
  • Biochemical experiments did not detect significant kinase activity.
  • Mutant analyses indicate CORYNE functions independently of kinase activity.

Conclusions:

  • The Arabidopsis protein CORYNE is likely a pseudokinase, not an active kinase.
  • This reclassification impacts our understanding of plant receptor kinase complexes and signaling.