PlantTFDB
Plant Transcription Factor Database
v4.0
Previous version: v1.0, v2.0, v3.0
Camelina sativa
ARR-B Family
Species TF ID Description
Csa01g019530.1ARR-B family protein
Csa02g015750.1ARR-B family protein
Csa02g035340.1ARR-B family protein
Csa02g062640.1ARR-B family protein
Csa03g055020.1ARR-B family protein
Csa04g003010.1ARR-B family protein
Csa05g081820.1ARR-B family protein
Csa05g083490.1ARR-B family protein
Csa05g095020.1ARR-B family protein
Csa06g001710.1ARR-B family protein
Csa07g002010.1ARR-B family protein
Csa07g033150.1ARR-B family protein
Csa07g033440.1ARR-B family protein
Csa07g055200.1ARR-B family protein
Csa08g044470.1ARR-B family protein
Csa08g057230.1ARR-B family protein
Csa09g003130.1ARR-B family protein
Csa09g090370.1ARR-B family protein
Csa10g010570.1ARR-B family protein
Csa10g027190.1ARR-B family protein
Csa10g029760.1ARR-B family protein
Csa11g011390.1ARR-B family protein
Csa11g034020.1ARR-B family protein
Csa11g078530.1ARR-B family protein
Csa11g091760.1ARR-B family protein
Csa12g014090.1ARR-B family protein
Csa12g044340.1ARR-B family protein
Csa12g053330.1ARR-B family protein
Csa13g009230.1ARR-B family protein
Csa13g050410.1ARR-B family protein
Csa13g050430.1ARR-B family protein
Csa14g055380.1ARR-B family protein
Csa15g021770.1ARR-B family protein
Csa16g002020.1ARR-B family protein
Csa16g027610.1ARR-B family protein
Csa16g046790.1ARR-B family protein
Csa17g080870.1ARR-B family protein
Csa18g018620.1ARR-B family protein
Csa18g031240.1ARR-B family protein
Csa18g031240.2ARR-B family protein
Csa19g023750.1ARR-B family protein
Csa20g009570.1ARR-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