PlantTFDB
Plant Transcription Factor Database
v4.0
Previous version: v1.0, v2.0, v3.0
Triticum aestivum
ARR-B Family
Species TF ID Description
Traes_3AL_9D2735F60.1ARR-B family protein
Traes_3B_D9F27151E.1ARR-B family protein
TRAES3BF094200030CFD_t1ARR-B family protein
TRAES3BF107400040CFD_t1ARR-B family protein
Traes_3DL_D82CA7827.1ARR-B family protein
Traes_4AS_6486B493A.1ARR-B family protein
Traes_4BL_941E7DE4D.2ARR-B family protein
Traes_4DL_2527CA8BF.2ARR-B family protein
Traes_6AL_9C9D677D4.1ARR-B family protein
Traes_6AS_A42E71A00.1ARR-B family protein
Traes_6BL_790C095EE.2ARR-B family protein
Traes_6BS_B50BEBC7E.2ARR-B family protein
Traes_6DL_D1C9CE275.1ARR-B family protein
Traes_6DS_EF4A57213.1ARR-B family protein
Traes_7AL_17EF1FF01.2ARR-B family protein
Traes_7AS_1318B59D3.2ARR-B family protein
Traes_7AS_503B57D77.1ARR-B family protein
Traes_7AS_DECB8080D.1ARR-B family protein
Traes_7BS_17C8D2707.1ARR-B family protein
Traes_7DL_3640B95AB.3ARR-B family protein
Traes_7DS_22DE624A5.1ARR-B family protein
Traes_7DS_327FBC2CA.2ARR-B family protein
ARR-B Family Introduction

The Arabidopsis genome codes for 22 response regulators (ARRs), 12 of which contain a Myb-like DNA binding domain called ARRM (type B). The remainder (type A) possess no apparent functional unit other than a signal receiver domain containing two aspartate and one lysine residues (DDK) at invariant positions, and their genes are transcriptionally induced by cytokinins without de novo protein synthesis. The type B members, ARR1 and ARR2, bind DNA in a sequence-specific manner and work as transcriptional activators.

Here we present evidence that ARR1 mediates a cytokinin signal, probably through its NH2-terminal signal receiver domain, and transactivates ARR6, which is immediately responsive to cytokinins. A paralogous response regulator, ARR2, shows almost identical characteristics to ARR1, suggesting a functional overlap. Residual cytokinin responses observed with the arr1-1 mutant may have been provided by ARR2. In addition to ARR6, other type A member genes, including ARR4, ARR5, ARR7, ARR8, and ARR9, were also activated by DEX at various levels in 35S::ARR1DDK::GR plants, suggesting that all the immediate cytokinin-responsive genes belonging to this group are directly activated by ARR1. Also, other cytokinin-responsive genes whose promoter regions contain the ARR1 recognition sequences are possibly transactivated by ARR1. A screening for ARR1 target genes using transgenic 35S::ARR1-DDK::GR plants will shed light on the whole view of the early cytokinin signal transduction pathway. We conclude that ARR1 is a principal transcription factor-type response regulator that is involved in an early step of cytokinin signal transduction, possibly as a partner of the sensor histidine kinase CRE1.

Hiroe Sakai, Takashi Honma, Takashi Aoyama, Shusei Sato, Tomohiko Kato, Satoshi Tabata, Atsuhiro Oka
ARR1, a Transcription Factor for Genes Immediately Responsive to Cytokinins
Science, Vol 294, Issue 5546, 1519-1521, 16 November 2001