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Interaction of the Response Regulator ARR4 with Phytochrome B in Modulating Red Light Signaling

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Science  02 Nov 2001:
Vol. 294, Issue 5544, pp. 1108-1111
DOI: 10.1126/science.1065022

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Abstract

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.

  • * To whom correspondence should be addressed. E-mail: harterkl{at}uni-freiburg.de

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