PlantTFDB
Plant Transcription Factor Database
v4.0
Previous version: v1.0, v2.0, v3.0
Nicotiana tabacum
ARR-B Family
Species TF ID Description
XP_016436050.1ARR-B family protein
XP_016436051.1ARR-B family protein
XP_016436052.1ARR-B family protein
XP_016436053.1ARR-B family protein
XP_016436278.1ARR-B family protein
XP_016445017.1ARR-B family protein
XP_016445018.1ARR-B family protein
XP_016445019.1ARR-B family protein
XP_016445020.1ARR-B family protein
XP_016445021.1ARR-B family protein
XP_016445022.1ARR-B family protein
XP_016450284.1ARR-B family protein
XP_016451610.1ARR-B family protein
XP_016451611.1ARR-B family protein
XP_016451612.1ARR-B family protein
XP_016455294.1ARR-B family protein
XP_016461121.1ARR-B family protein
XP_016464421.1ARR-B family protein
XP_016465557.1ARR-B family protein
XP_016465558.1ARR-B family protein
XP_016465559.1ARR-B family protein
XP_016465560.1ARR-B family protein
XP_016467318.1ARR-B family protein
XP_016469917.1ARR-B family protein
XP_016472170.1ARR-B family protein
XP_016474672.1ARR-B family protein
XP_016474673.1ARR-B family protein
XP_016474674.1ARR-B family protein
XP_016474675.1ARR-B family protein
XP_016474676.1ARR-B family protein
XP_016474677.1ARR-B family protein
XP_016481337.1ARR-B family protein
XP_016481338.1ARR-B family protein
XP_016484728.1ARR-B family protein
XP_016484729.1ARR-B family protein
XP_016486380.1ARR-B family protein
XP_016487452.1ARR-B family protein
XP_016489429.1ARR-B family protein
XP_016495886.1ARR-B family protein
XP_016495887.1ARR-B family protein
XP_016495888.1ARR-B family protein
XP_016499181.1ARR-B family protein
XP_016501541.1ARR-B family protein
XP_016510575.1ARR-B family protein
XP_016510576.1ARR-B family protein
XP_016510577.1ARR-B family protein
XP_016510578.1ARR-B family protein
XP_016510623.1ARR-B family protein
XP_016510624.1ARR-B family protein
XP_016510625.1ARR-B family protein
XP_016510626.1ARR-B family protein
XP_016510627.1ARR-B family protein
XP_016511668.1ARR-B family protein
XP_016511669.1ARR-B family protein
XP_016511670.1ARR-B family protein
XP_016511671.1ARR-B family protein
XP_016511672.1ARR-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