Plant Transcription Factor Database
Previous version: v3.0
Aegilops tauschii
G2-like Family
Species TF ID Description
EMT01045G2-like family protein
EMT01724G2-like family protein
EMT02164G2-like family protein
EMT03062G2-like family protein
EMT03495G2-like family protein
EMT03587G2-like family protein
EMT03622G2-like family protein
EMT04645G2-like family protein
EMT07674G2-like family protein
EMT08108G2-like family protein
EMT09301G2-like family protein
EMT09351G2-like family protein
EMT09548G2-like family protein
EMT11720G2-like family protein
EMT12202G2-like family protein
EMT12774G2-like family protein
EMT14894G2-like family protein
EMT16225G2-like family protein
EMT16442G2-like family protein
EMT16677G2-like family protein
EMT17282G2-like family protein
EMT17676G2-like family protein
EMT17924G2-like family protein
EMT18307G2-like family protein
EMT19311G2-like family protein
EMT19606G2-like family protein
EMT19786G2-like family protein
EMT20801G2-like family protein
EMT20949G2-like family protein
EMT21538G2-like family protein
EMT22828G2-like family protein
EMT23891G2-like family protein
EMT25059G2-like family protein
EMT26247G2-like family protein
EMT27812G2-like family protein
EMT27986G2-like family protein
EMT28079G2-like family protein
EMT28465G2-like family protein
EMT28996G2-like family protein
EMT31949G2-like family protein
EMT33395G2-like family protein
EMT33573G2-like family protein
G2-like Family Introduction

The GLK proteins are members of the recently categorized GARP superfamily of transcription factors (Riechmann et al., 2000) defined by G2 in maize; the Arabidopsis RESPONSE REGULATOR-B (ARR-B) proteins (Imamura et al., 1999); and the PHOSPHATE STARVATION RESPONSE1 (PSR1) protein of Chlamydomonas (Wykoff et al., 1999). In the case of G2, three of the four defining features of most transcription factors have been verified experimentally in heterologous systems. G2 is nuclearlocalized (Hall et al., 1998), is able to transactivate reporter gene expression, and can both homo-dimerize and heterodimerize with ZmGLK1 (Rossini et al., 2001). DNA-binding activity of GLK proteins has yet to be demonstrated,however, the putative DNA-binding domain is highly conserved with domains in other GARP proteins such as ARR1 and ARR2 (Riechmann et al., 2000). Notably, ARR1 and ARR2 have been shown to bind DNA (Sakai et al.,2000), thus it is likely that GLK proteins act as transcriptional regulators of chloroplast development.

The GLK proteins are members of the GARP superfamily of transcription factors, and phylogenetic analysis demonstrates that the maize, rice and Arabidopsis GLK gene pairs comprise a distinct group within the GARP superfamily. Further phylogenetic analysis suggests that the gene pairs arose through separate duplication events in the monocot and dicot lineages. As in rice, AtGLK1 and AtGLK2 are expressed in partially overlapping domains in photosynthetic tissue. GLK genes therefore regulate chloroplast development in diverse plant species.

Fitter DW, Martin DJ, Copley MJ, Scotland RW, Langdale JA.
GLK gene pairs regulate chloroplast development in diverse plant species.
Plant J. 2002 Sep;31(6):713-27.
PMID: 12220263