Immunophilin-like FKBP42/TWISTED DWARF1 Interacts with the Receptor Kinase BRI1 to Regulate Brassinosteroid Signaling in Arabidopsis

Overview

Journal Mol Plant

Publisher Cell Press

Specialties Biology
Molecular Biology

Date 2016 Jan 26

PMID 26808213

Citations 13

Authors

Juthamas Chaiwanon

Veder J Garcia

Heather Cartwright

Ying Sun

Zhi-Yong Wang

Affiliations

Soon will be listed here.

Abstract

Mutation of the immunophilin-like FK506-binding protein TWISTED DWARF1 (FKBP42/TWD1) causes dwarf and twisted-organ phenotypes in Arabidopsis. However, the function of FKBP42 is not fully understood at the molecular level. Using genetic, physiological, and immunological experiments, we show here that FKBP42/TWD1 is necessary for brassinosteroid (BR) signal transduction. The twd1 mutant showed reduced BR sensitivity in growth responses and activation of the BZR1 transcription factor. However, twd1 showed normal responses to an inhibitor of BIN2/GSK3, suggesting that twd1 has a defect upstream of BIN2 in the BR signaling pathway. In vitro and in vivo assays showed that TWD1 interacts physically with the kinase domains of the BR receptor kinases BRI1 and BAK1. TWD1 is not required for normal localization of BRI1-GFP to the plasma membrane or for activation of the flagellin receptor kinase FLS2. Our results suggest that FKBP42/TWD1 plays a specific role in the activation of BRI1 receptor kinase.

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