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

Perception of UV-B by the Arabidopsis UVR8 protein.

Author information

1
Faculty of Biology, Institute of Biology II, University of Freiburg, D-79104 Freiburg, Germany.

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.

PMID:
21454788
DOI:
10.1126/science.1200660
[Indexed for MEDLINE]
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