PlantTFDB
Plant Transcription Factor Database
v4.0
Previous version: v1.0, v2.0, v3.0
Gossypium hirsutum
ARR-B Family
Species TF ID Description
Gh_A01G0217ARR-B family protein
Gh_A03G1136ARR-B family protein
Gh_A03G2117ARR-B family protein
Gh_A05G0407ARR-B family protein
Gh_A05G0473ARR-B family protein
Gh_A05G3994ARR-B family protein
Gh_A07G0197ARR-B family protein
Gh_A07G0776ARR-B family protein
Gh_A07G1154ARR-B family protein
Gh_A08G1440ARR-B family protein
Gh_A08G2252ARR-B family protein
Gh_A09G2069ARR-B family protein
Gh_A10G1504ARR-B family protein
Gh_A11G1020ARR-B family protein
Gh_A12G0948ARR-B family protein
Gh_A12G1918ARR-B family protein
Gh_A12G2356ARR-B family protein
Gh_A13G1590ARR-B family protein
Gh_D02G1409ARR-B family protein
Gh_D02G1568ARR-B family protein
Gh_D03G1622ARR-B family protein
Gh_D05G0524ARR-B family protein
Gh_D05G0587ARR-B family protein
Gh_D05G3931ARR-B family protein
Gh_D07G0251ARR-B family protein
Gh_D07G1252ARR-B family protein
Gh_D07G2436ARR-B family protein
Gh_D08G1734ARR-B family protein
Gh_D08G2618ARR-B family protein
Gh_D09G2278ARR-B family protein
Gh_D10G1750ARR-B family protein
Gh_D11G1176ARR-B family protein
Gh_D12G1041ARR-B family protein
Gh_D12G2098ARR-B family protein
Gh_D12G2493ARR-B family protein
Gh_D13G1951ARR-B family protein
Gh_Sca005214G03ARR-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