PlantRegMap/PlantTFDB v5.0
Plant Transcription Factor Database
Previous version: v3.0 v4.0
Spirodela polyrhiza
G2-like Family
Species TF ID Description
Spipo0G0029600G2-like family protein
Spipo0G0051900G2-like family protein
Spipo0G0094200G2-like family protein
Spipo0G0099600G2-like family protein
Spipo11G0010800G2-like family protein
Spipo11G0061900G2-like family protein
Spipo12G0022900G2-like family protein
Spipo12G0037300G2-like family protein
Spipo12G0066300G2-like family protein
Spipo13G0033400G2-like family protein
Spipo18G0031200G2-like family protein
Spipo19G0008000G2-like family protein
Spipo1G0009300G2-like family protein
Spipo1G0051500G2-like family protein
Spipo22G0018300G2-like family protein
Spipo23G0039200G2-like family protein
Spipo26G0023800G2-like family protein
Spipo27G0017800G2-like family protein
Spipo29G0025300G2-like family protein
Spipo2G0037400G2-like family protein
Spipo2G0119000G2-like family protein
Spipo2G0120600G2-like family protein
Spipo3G0022800G2-like family protein
Spipo4G0004100G2-like family protein
Spipo5G0019100G2-like family protein
Spipo5G0019200G2-like family protein
Spipo5G0044100G2-like family protein
Spipo5G0073700G2-like family protein
Spipo6G0056100G2-like family protein
Spipo7G0060400G2-like family protein
Spipo8G0062400G2-like family protein
Spipo9G0028800G2-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