PlantRegMap/PlantTFDB v5.0
Plant Transcription Factor Database
Previous version: v3.0 v4.0
Durio zibethinus
ARR-B Family
Species TF ID Description
XP_022714813.1ARR-B family protein
XP_022723167.1ARR-B family protein
XP_022723168.1ARR-B family protein
XP_022723169.1ARR-B family protein
XP_022725014.1ARR-B family protein
XP_022726749.1ARR-B family protein
XP_022732021.1ARR-B family protein
XP_022732092.1ARR-B family protein
XP_022732101.1ARR-B family protein
XP_022732109.1ARR-B family protein
XP_022732119.1ARR-B family protein
XP_022734166.1ARR-B family protein
XP_022737338.1ARR-B family protein
XP_022738483.1ARR-B family protein
XP_022738484.1ARR-B family protein
XP_022738485.1ARR-B family protein
XP_022741587.1ARR-B family protein
XP_022741595.1ARR-B family protein
XP_022741601.1ARR-B family protein
XP_022750217.1ARR-B family protein
XP_022750218.1ARR-B family protein
XP_022750306.1ARR-B family protein
XP_022754188.1ARR-B family protein
XP_022754525.1ARR-B family protein
XP_022754642.1ARR-B family protein
XP_022756309.1ARR-B family protein
XP_022757651.1ARR-B family protein
XP_022757659.1ARR-B family protein
XP_022760020.1ARR-B family protein
XP_022760633.1ARR-B family protein
XP_022760634.1ARR-B family protein
XP_022760635.1ARR-B family protein
XP_022769503.1ARR-B family protein
XP_022776231.1ARR-B family protein
XP_022776233.1ARR-B family protein
XP_022776489.1ARR-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