OsREM4.1 Interacts with OsSERK1 to Coordinate the Interlinking between Abscisic Acid and Brassinosteroid Signaling in Rice

Jinshan Gui, Shuai Zheng, Chang Liu, Junhui Shen, Jianming Li, Laigeng Li*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

108 Citations (Scopus)

Abstract

Crosstalk among phytohormones is crucial for balancing plant growth and adjustment to various environments. Abscisic acid (ABA) and brassinosteroids (BRs) exhibit antagonistic interactions during many plant development processes, but little is known about the molecular mechanism mediating those interactions. Here, we identified a rice (Oryza sativa) remorin gene, OsREM4.1, whose expression is upregulated by ABA through the transcriptional activator OsbZIP23. OsREM4.1, in return, negatively regulates BR signaling output. We discovered that OsREM4.1 interacts with OsSERK1 to inhibit its interaction with rice BR receptor OsBRI1. Moreover, OsBRI1 could phosphorylate OsREM4.1 to reduce the binding affinity of OsREM4.1 to OsSERK1. These results demonstrate that OsREM4.1 is transcriptionally regulated by ABA and functions as an OsBRI1 substrate and OsSERK1-interacting protein to inhibit the formation and subsequent activation of the OsBRI1-OsSERK1 receptor complex. Our findings provide insight into the mechanism by which the antagonistic interactions between ABA and BRs are coordinated in rice.

Original languageEnglish
Pages (from-to)201-213
Number of pages13
JournalDevelopmental Cell
Volume38
Issue number2
DOIs
Publication statusPublished - 25 Jul 2016

Scopus Subject Areas

  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Developmental Biology
  • Cell Biology

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