PlantTFDB
Plant Transcription Factor Database
v4.0
Previous version: v1.0, v2.0, v3.0
Medicago truncatula
G2-like Family
Species TF ID Description
Medtr0223s0040.1G2-like family protein
Medtr1g021520.1G2-like family protein
Medtr1g053800.1G2-like family protein
Medtr1g053830.1G2-like family protein
Medtr1g053835.1G2-like family protein
Medtr1g080330.1G2-like family protein
Medtr1g080330.2G2-like family protein
Medtr1g090670.1G2-like family protein
Medtr1g090670.2G2-like family protein
Medtr1g093080.1G2-like family protein
Medtr1g093080.2G2-like family protein
Medtr1g093080.3G2-like family protein
Medtr1g112370.1G2-like family protein
Medtr2g016220.1G2-like family protein
Medtr2g016220.2G2-like family protein
Medtr2g016220.3G2-like family protein
Medtr2g016220.4G2-like family protein
Medtr2g023580.1G2-like family protein
Medtr2g027800.1G2-like family protein
Medtr2g027800.2G2-like family protein
Medtr2g027800.3G2-like family protein
Medtr2g027800.4G2-like family protein
Medtr2g027860.1G2-like family protein
Medtr2g027860.2G2-like family protein
Medtr2g084230.1G2-like family protein
Medtr2g084230.2G2-like family protein
Medtr2g084230.3G2-like family protein
Medtr2g084230.4G2-like family protein
Medtr2g086450.1G2-like family protein
Medtr2g090675.1G2-like family protein
Medtr3g064840.1G2-like family protein
Medtr3g450310.1G2-like family protein
Medtr4g064730.1G2-like family protein
Medtr4g078810.1G2-like family protein
Medtr4g081710.1G2-like family protein
Medtr4g086835.1G2-like family protein
Medtr4g086835.2G2-like family protein
Medtr4g113140.1G2-like family protein
Medtr4g121020.2G2-like family protein
Medtr5g014040.4G2-like family protein
Medtr5g017980.1G2-like family protein
Medtr5g017980.2G2-like family protein
Medtr5g017980.3G2-like family protein
Medtr5g027440.1G2-like family protein
Medtr5g029470.1G2-like family protein
Medtr5g041350.1G2-like family protein
Medtr5g054300.1G2-like family protein
Medtr6g005650.1G2-like family protein
Medtr6g032990.1G2-like family protein
Medtr6g032990.2G2-like family protein
Medtr6g071625.1G2-like family protein
Medtr6g444980.1G2-like family protein
Medtr6g444980.2G2-like family protein
Medtr6g453220.1G2-like family protein
Medtr7g068600.1G2-like family protein
Medtr7g069660.1G2-like family protein
Medtr7g088070.1G2-like family protein
Medtr7g088070.2G2-like family protein
Medtr7g089010.1G2-like family protein
Medtr7g093010.1G2-like family protein
Medtr7g093030.1G2-like family protein
Medtr7g093030.2G2-like family protein
Medtr7g098250.1G2-like family protein
Medtr7g105480.1G2-like family protein
Medtr7g115530.1G2-like family protein
Medtr7g115530.2G2-like family protein
Medtr7g115530.3G2-like family protein
Medtr7g115530.4G2-like family protein
Medtr7g115530.5G2-like family protein
Medtr7g115530.6G2-like family protein
Medtr7g115530.7G2-like family protein
Medtr7g115530.8G2-like family protein
Medtr8g066310.1G2-like family protein
Medtr8g086410.1G2-like family protein
Medtr8g086410.2G2-like family protein
Medtr8g086410.3G2-like family protein
Medtr8g086410.4G2-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