Perception of UV-B by the Arabidopsis UVR8 Protein

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

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)103-106
Number of pages4
JournalScience
Volume332
Issue number6025
DOIs
Publication statusPublished - 1 Apr 2011

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