Sweere U, Eichenberg K, Lohrmann J, Mira-Rodado V, Baeurle I, Kudla J, Nagy F, Schafer E, Harter K

Institut fuer Biologie II / Botanik, Universitaet Freiburg, Schaenzlestrasse 1, 79104 Freiburg, Germany.

The Arabidopsis thaliana response regulator 4, expressed in response to phytochrome B action, specifically interacts with the extreme amino-terminus of the photoreceptor. The response regulator 4 stabilizes the active Pfr form of phytochrome B in yeast and in planta, thus elevates the level of the active photoreceptor in vivo. Accordingly, transgenic Arabidopsis plants overexpressing the response regulator 4 display hypersensitivity to red light but not to light of other wavelengths. We propose that the response regulator 4 acts as an output element of a two-component system that modulates red light signaling on the level of the phytochrome B photoreceptor.

Mesh Terms:
Arabidopsis, Arabidopsis Proteins, Cell Nucleus, Cytoplasm, Darkness, Genes, Plant, Light, Phenotype, Phosphorylation, Photoreceptor Cells, Phytochrome, Phytochrome B, Plants, Genetically Modified, Protein Conformation, Recombinant Fusion Proteins, Signal Transduction, Transcription Factors, Two-Hybrid System Techniques, Yeasts

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