Interaction of the response regulator ARR4 with phytochrome B in modulating red light signaling.
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
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
Science
Date: Nov. 02, 2001
PubMed ID: 11691995
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