title: Perception of UV-B by the Arabidopsis UVR8 protein.
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.
authors: Faculty of Biology, Institute of Biology II, University of Freiburg, D-79104 Freiburg, Germany.
authors: Luca
authors: L
authors: Rizzini
authors: Jean-Jacques
authors: JJ
authors: Favory
authors: Catherine
authors: C
authors: Cloix
authors: Davide
authors: D
authors: Faggionato
authors: Andrew
authors: A
authors: O'Hara
authors: Eirini
authors: E
authors: Kaiserli
authors: Ralf
authors: R
authors: Baumeister
authors: Eberhard
authors: E
authors: Schäfer
authors: Ferenc
authors: F
authors: Nagy
authors: Gareth I
authors: GI
authors: Jenkins
authors: Roman
authors: R
authors: Ulm
mesh_terms: D017360:Arabidopsis; D029681:Arabidopsis Proteins / Q000528:radiation effects*; D002868:Chromosomal Proteins, Non-Histone / Q000528:radiation effects*; D055537:Light Signal Transduction; D055519:Photoreceptors, Plant / Q000502:physiology; D013472:Sunlight; D020798:Two-Hybrid System Techniques; D014466:Ultraviolet Rays
chemical_list: D029681:Arabidopsis Proteins; D002868:Chromosomal Proteins, Non-Histone; D055519:Photoreceptors, Plant; C525052:Uvr8 protein, Arabidopsis