Perception of UV-B by the Arabidopsis UVR8 protein |
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| Authors: | Rizzini Luca Favory Jean-Jacques Cloix Catherine Faggionato Davide O'Hara Andrew Kaiserli Eirini Baumeister Ralf Schäfer Eberhard Nagy Ferenc Jenkins Gareth I Ulm Roman |
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| Institution: | Faculty of Biology, Institute of Biology II, University of Freiburg, D-79104 Freiburg, Germany. |
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| Abstract: | To optimize their growth and survival, plants perceive and respond to ultraviolet-B (UV-B) radiation. However, neither the molecular identity of the UV-B photoreceptor nor the photoperception mechanism is known. Here we show that dimers of the UVR8 protein perceive UV-B, probably by a tryptophan-based mechanism. Absorption of UV-B induces instant monomerization of the photoreceptor and interaction with COP1, the central regulator of light signaling. Thereby this signaling cascade controlled by UVR8 mediates UV-B photomorphogenic responses securing plant acclimation and thus promotes survival in sunlight. |
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