GrassTFDB :: Browse Family::Maize

Displaying GeBP Family from Maize


Trichomes of Arabidopsis are single-celled epidermal hair that are a useful model for studying plant cell fate determination. Trichome initiation requires the activity of the GLABROUS1 (GL1) gene whose expression in epidermal and trichome cells is dependent on the presence of a 3'-cis-regulatory element. Using a one-hybrid screen, we have isolated a cDNA, which encodes for a protein, GL1 enhancer binding protein (GeBP), that binds this regulatory element in yeast and in vitro. GeBP and its three homologues in Arabidopsis share two regions: a central region with no known motifs and a C-terminal region with a putative leucine-zipper motif. We show that both regions are necessary for trans-activation in yeast. A translational fusion with the Yellow Fluorescent Protein (YFP) indicates that GeBP is a nuclear protein whose localization is restricted to, on average, 3-5 subnuclear foci that might correspond to nucleoli. Transcriptional fusion with the GUS reporter indicates that GeBP is mainly expressed in vegetative meristematic tissues and in very young leaf primordia. We looked at GeBP expression in plants mutated in or misexpressing KNAT1, a KNOX gene, expressed in the shoot apical meristem and downregulated in leaf founder cells, and found that GeBP transcript level is regulated by KNAT1 suggesting that KNAT1 is a transcriptional activator of GeBP. This regulation suggests that GeBP is acting as a repressor of leaf cell fate.

Protein Name
accepted / suggested
Gene Locus Synonym/
Gene Name
Clone in TFome Genome Browser
ZmGBP1 GRMZM2G392516 GBPTF1 View in Browser
ZmGBP2 GRMZM2G065506 GBPTF2 pUT3234 View in Browser
ZmGBP3 GRMZM2G041818 GBPTF3 pUT1766 View in Browser
ZmGBP4 GRMZM2G066373 GBPTF4 pUT4719 View in Browser
ZmGBP5 GRMZM2G162405 GBPTF5 View in Browser
ZmGBP6 GRMZM2G075122 GBPTF6 pUT3117 View in Browser
ZmGBP7 GRMZM2G092409 GBPTF7 pUT3141 View in Browser
ZmGBP8 GRMZM2G134866 GBPTF8 pUT3240 View in Browser
ZmGBP9 GRMZM2G030458 GBPTF9 View in Browser
ZmGBP10 GRMZM2G008558 GBPTF10 pUT6203 View in Browser
ZmGBP11 GRMZM2G006871 GBPTF11 pUT3123 View in Browser
ZmGBP12 GRMZM2G082318 GBPTF12 pUT2289 View in Browser
ZmGBP13 GRMZM2G155252 GBPTF13 pUT3643 View in Browser
ZmGBP14 GRMZM2G125239 AY111962 pUT3380 View in Browser
ZmGBP15 GRMZM2G036966 GBPTF15 pUT3058 View in Browser
ZmGBP16 GRMZM2G174240 GBPTF16 pUT3057 View in Browser
ZmGBP17 GRMZM2G083886 GBPTF17 pUT3118 View in Browser
ZmGBP18 GRMZM2G026417 GBPTF18 pUT3119 View in Browser
ZmGBP19 GRMZM5G868875 GBPTF19 pUT3039 View in Browser
ZmGBP20 GRMZM2G423292 GBPTF20 pUT6116 View in Browser
ZmGBP21 EF517601.1_FG010 GBPTF21 pUT3052 View in Browser