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. 2011 Apr 1;332(6025):103-6.
doi: 10.1126/science.1200660.

Perception of UV-B by the Arabidopsis UVR8 protein

Luca Rizzini  1 , Jean-Jacques Favory, Catherine Cloix, Davide Faggionato, Andrew O'Hara, Eirini Kaiserli, Ralf Baumeister, Eberhard Schäfer, Ferenc Nagy, Gareth I Jenkins, Roman Ulm
Affiliations

Perception of UV-B by the Arabidopsis UVR8 protein

Luca Rizzini et al. Science. .

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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