PlantRegMap/PlantTFDB v5.0
Plant Transcription Factor Database
Trifolium medium
G2-like Family
Species TF ID Description
MCH80757.1G2-like family protein
MCH84955.1G2-like family protein
MCH86797.1G2-like family protein
MCH95179.1G2-like family protein
MCH95509.1G2-like family protein
MCH96018.1G2-like family protein
MCH97134.1G2-like family protein
MCH97389.1G2-like family protein
MCH97710.1G2-like family protein
MCI01301.1G2-like family protein
MCI01600.1G2-like family protein
MCI03617.1G2-like family protein
MCI06105.1G2-like family protein
MCI06543.1G2-like family protein
MCI07536.1G2-like family protein
MCI09471.1G2-like family protein
MCI18831.1G2-like family protein
MCI19756.1G2-like family protein
MCI22288.1G2-like family protein
MCI23218.1G2-like family protein
MCI24564.1G2-like family protein
MCI25230.1G2-like family protein
MCI26794.1G2-like family protein
MCI31068.1G2-like family protein
MCI31842.1G2-like family protein
MCI33705.1G2-like family protein
MCI60588.1G2-like family protein
MCI64922.1G2-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