Pesch, Martina, Dartan, Burcu, Birkenbihl, Rainer, Somssich, Imre E. and Huelskamp, Martin (2014). Arabidopsis TTG2 Regulates TRY Expression through Enhancement of Activator Complex-Triggered Activation. Plant Cell, 26 (10). S. 4067 - 4084. ROCKVILLE: AMER SOC PLANT BIOLOGISTS. ISSN 1531-298X

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Abstract

Trichome patterning in Arabidopsis thaliana is regulated by a regulatory feedback loop of the trichome promoting factors TRANSPARENT TESTA GLABRA1 (TTG1), GLABRA3 (GL3)/ENHANCER OF GL3 (EGL3), and GL1 and a group of homologous R3MYB proteins that act as their inhibitors. Together, they regulate the temporal and spatial expression of GL2 and TTG2, which are considered to control trichome cell differentiation. In this work, we show that TTG2 is a specific activator of TRY (but not CPC or GL2). The WRKY protein TTG2 binds to W-boxes in a minimal promoter fragment of TRY, and these W-boxes are essential for rescue of the try mutant phenotype. We further show that TTG2 alone is not able to activate TRY expression, but rather drastically enhances the activation by TTG1 and GL3. As TTG2 physically interacts with TTG1 and because TTG2 can associate with GL3 through its interaction with TTG1, we propose that TTG2 enhances the activity of TTG1 and GL3 by forming a protein complex.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Pesch, MartinaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dartan, BurcuUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Birkenbihl, RainerUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Somssich, Imre E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Huelskamp, MartinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-426323
DOI: 10.1105/tpc.114.129379
Journal or Publication Title: Plant Cell
Volume: 26
Number: 10
Page Range: S. 4067 - 4084
Date: 2014
Publisher: AMER SOC PLANT BIOLOGISTS
Place of Publication: ROCKVILLE
ISSN: 1531-298X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
MYB TRANSCRIPTION FACTORS; DNA-BINDING PROTEINS; EPIDERMAL-CELL FATE; TRICHOME DEVELOPMENT; GENE; ROOT; GL3; ENCODES; GLABRA2; DIFFERENTIATIONMultiple languages
Biochemistry & Molecular Biology; Plant Sciences; Cell BiologyMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/42632

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