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BAK1 directly regulates brassinosteroid perception and BRI1 activation.

Kai He1, Shengbao Xu, Jia Li

  • 1Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China.

Journal of Integrative Plant Biology
|December 7, 2013
PubMed
Summary

Brassinosteroid (BR) signaling is regulated by receptor-like kinases (RLKs). Recent studies clarify that BAK1 is essential for BR perception and signaling activation, serving as a paradigm for RLK co-receptor function.

Keywords:
ArabidopsisBAK1BRI1brassinosteroidco-receptorextracellular domainleucine-rich repeatreceptorreceptor-like kinase

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Area of Science:

  • Plant biology
  • Molecular signaling
  • Biochemistry

Background:

  • Receptor-like kinases (RLKs) in plants perceive external signals for growth and immunity.
  • BAK1 functions as a co-receptor for various RLKs, but its specific role has been debated.
  • Understanding RLK co-receptor mechanisms is crucial for plant science.

Purpose of the Study:

  • To clarify the precise role of BAK1 in plant signaling pathways.
  • To elucidate the mechanism of brassinosteroid (BR) perception and signaling.
  • To establish a paradigm for RLK co-receptor function.

Main Methods:

  • Genetic analyses of BAK1 and its homologs.
  • Structural analyses of RLK complexes.
  • Investigating brassinosteroid (BR) perception and signaling pathways.

Main Results:

  • BAK1 and its homologs are essential for the brassinosteroid (BR) signaling pathway.
  • BAK1 directly perceives the BR ligand.
  • BAK1 activates the BR receptor, BRI1, initiating downstream signaling.

Conclusions:

  • BAK1 plays an indispensable role in BR signaling, not merely as an amplifier.
  • The BAK1-BRI1 interaction provides a model for ligand-mediated RLK co-receptor activation.
  • This clarifies the function of RLKs in coordinating plant growth and development.