Plant Transcription Factor Database
Previous version: v3.0
Pyrus bretschneideri
BES1 Family
Species TF ID Description
Pbr000539.1BES1 family protein
Pbr005006.1BES1 family protein
Pbr006182.1BES1 family protein
Pbr006791.1BES1 family protein
Pbr016089.1BES1 family protein
Pbr017252.1BES1 family protein
Pbr020081.1BES1 family protein
Pbr022869.1BES1 family protein
Pbr024193.1BES1 family protein
Pbr031777.3BES1 family protein
Pbr035288.1BES1 family protein
Pbr037483.1BES1 family protein
BES1 Family Introduction

Brassinosteroids (BRs) signal through a plasma membrane-localized receptor kinase to regulate plant growth and development. We showed previously that a novel protein, BES1(BRI1-EMS-SUPPRESSOR 1), accumulates in the nucleus in response to BRs, where it plays a role in BR-regulated gene expression; however, the mechanism by which BES1 regulates gene expression is unknown. In this study, we dissect BES1 subdomains and establish that BES1 is a transcription factor that binds to and activates BR target gene promoters both in vitro and in vivo. BES1 interacts with a basic helix-loop-helix protein, BIM1, to synergistically bind to E box (CANNTG) sequences present in many BR-induced promoters. Loss-of-function and gain-of-function mutants of BIM1 and its close family members display BR response phenotypes. Thus, BES1 defines a new class of plant-specific transcription factors that cooperate with transcription factors such as BIM1 to regulate BR-induced genes.

Yin Y, Vafeados D, Tao Y, Yoshida S, Asami T, Chory J.
A new class of transcription factors mediates brassinosteroid-regulated gene expression in Arabidopsis.
Cell. 2005 Jan 28;120(2):249-59.
PMID: 15680330