PlantRegMap/PlantTFDB v5.0
Plant Transcription Factor Database
Citrullus lanatus
G2-like Family
Species TF ID Description
Cla000582G2-like family protein
Cla001822G2-like family protein
Cla002686G2-like family protein
Cla003506G2-like family protein
Cla003729G2-like family protein
Cla005481G2-like family protein
Cla005952G2-like family protein
Cla007979G2-like family protein
Cla008221G2-like family protein
Cla008833G2-like family protein
Cla009148G2-like family protein
Cla009698G2-like family protein
Cla010265G2-like family protein
Cla011667G2-like family protein
Cla012091G2-like family protein
Cla012305G2-like family protein
Cla013124G2-like family protein
Cla013322G2-like family protein
Cla013447G2-like family protein
Cla013537G2-like family protein
Cla014366G2-like family protein
Cla014367G2-like family protein
Cla014441G2-like family protein
Cla015112G2-like family protein
Cla015991G2-like family protein
Cla016239G2-like family protein
Cla016743G2-like family protein
Cla016935G2-like family protein
Cla017441G2-like family protein
Cla017481G2-like family protein
Cla018083G2-like family protein
Cla018434G2-like family protein
Cla020369G2-like family protein
Cla020427G2-like family protein
Cla020715G2-like family protein
Cla021419G2-like family protein
Cla022530G2-like family protein
Cla023240G2-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