PlantRegMap/PlantTFDB v5.0
Plant Transcription Factor Database
Gossypium raimondii
ARR-B Family
Species TF ID Description
Gorai.001G030600.1ARR-B family protein
Gorai.001G030600.2ARR-B family protein
Gorai.001G096700.1ARR-B family protein
Gorai.001G142000.1ARR-B family protein
Gorai.002G029200.1ARR-B family protein
Gorai.002G029200.2ARR-B family protein
Gorai.002G029200.3ARR-B family protein
Gorai.002G029200.4ARR-B family protein
Gorai.003G180100.1ARR-B family protein
Gorai.003G180100.2ARR-B family protein
Gorai.003G180100.3ARR-B family protein
Gorai.004G188300.1ARR-B family protein
Gorai.004G188300.2ARR-B family protein
Gorai.004G188300.3ARR-B family protein
Gorai.004G291100.1ARR-B family protein
Gorai.004G291100.2ARR-B family protein
Gorai.005G156900.1ARR-B family protein
Gorai.005G156900.2ARR-B family protein
Gorai.005G173300.1ARR-B family protein
Gorai.005G173300.2ARR-B family protein
Gorai.006G259700.1ARR-B family protein
Gorai.006G259700.2ARR-B family protein
Gorai.006G259700.3ARR-B family protein
Gorai.007G125800.1ARR-B family protein
Gorai.007G240900.1ARR-B family protein
Gorai.008G116600.1ARR-B family protein
Gorai.008G228800.1ARR-B family protein
Gorai.008G228800.2ARR-B family protein
Gorai.008G228800.3ARR-B family protein
Gorai.008G280500.1ARR-B family protein
Gorai.009G006200.1ARR-B family protein
Gorai.009G054200.1ARR-B family protein
Gorai.009G054200.2ARR-B family protein
Gorai.009G061000.1ARR-B family protein
Gorai.009G061000.2ARR-B family protein
Gorai.010G243900.1ARR-B family protein
Gorai.011G196400.1ARR-B family protein
Gorai.011G196400.2ARR-B family protein
Gorai.011G196400.3ARR-B family protein
Gorai.011G196400.4ARR-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