PlantRegMap/PlantTFDB v5.0
Plant Transcription Factor Database
Previous version: v3.0 v4.0
Cucumis melo
G2-like Family
Species TF ID Description
MELO3C002153P1G2-like family protein
MELO3C003375P4G2-like family protein
MELO3C003436P1G2-like family protein
MELO3C004535P1G2-like family protein
MELO3C006313P1G2-like family protein
MELO3C007210P1G2-like family protein
MELO3C007400P1G2-like family protein
MELO3C007540P1G2-like family protein
MELO3C007988P1G2-like family protein
MELO3C007989P1G2-like family protein
MELO3C008548P1G2-like family protein
MELO3C008929P1G2-like family protein
MELO3C009690P1G2-like family protein
MELO3C009733P1G2-like family protein
MELO3C010134P1G2-like family protein
MELO3C010906P1G2-like family protein
MELO3C011546P1G2-like family protein
MELO3C012218P1G2-like family protein
MELO3C012282P1G2-like family protein
MELO3C012590P1G2-like family protein
MELO3C012848P1G2-like family protein
MELO3C013578P1G2-like family protein
MELO3C014042P1G2-like family protein
MELO3C015950P1G2-like family protein
MELO3C015951P1G2-like family protein
MELO3C018255P1G2-like family protein
MELO3C018430P1G2-like family protein
MELO3C018430P2G2-like family protein
MELO3C019117P1G2-like family protein
MELO3C019337P1G2-like family protein
MELO3C019573P1G2-like family protein
MELO3C019621P1G2-like family protein
MELO3C019621P2G2-like family protein
MELO3C020611P1G2-like family protein
MELO3C021290P2G2-like family protein
MELO3C021917P1G2-like family protein
MELO3C022542P1G2-like family protein
MELO3C022765P1G2-like family protein
MELO3C022963P1G2-like family protein
MELO3C025116P1G2-like family protein
MELO3C025295P1G2-like family protein
MELO3C025894P1G2-like family protein
MELO3C026010P1G2-like family protein
MELO3C026896P1G2-like family protein
MELO3C026896P2G2-like family protein
MELO3C027103P1G2-like family protein
MELO3C027301P1G2-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