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Interaction of COP1 and UVR8 regulates UV-B-induced photomorphogenesis and stress acclimation in Arabidopsis

Favory, Jean-Jacques
Stec, Agnieszka
Gruber, Henriette
Rizzini, Luca
Oravecz, Attila
Funk, Markus
Albert, Andreas
Cloix, Catherine
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Published in EMBO Journal. 2009, vol. 28, no. 5, p. 591-601
Abstract The ultraviolet-B (UV-B) portion of the solar radiation functions as an environmental signal for which plants have evolved specific and sensitive UV-B perception systems. The UV-B-specific UV RESPONSE LOCUS 8 (UVR8) and the multifunctional E3 ubiquitin ligase CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1) are key regulators of the UV-B response. We show here that uvr8-null mutants are deficient in UV-B-induced photomorphogenesis and hypersensitive to UV-B stress, whereas overexpression of UVR8 results in enhanced UV-B photomorphogenesis, acclimation and tolerance to UV-B stress. By using sun simulators, we provide evidence at the physiological level that UV-B acclimation mediated by the UV-B-specific photoregulatory pathway is indeed required for survival in sunlight. At the molecular level, we demonstrate that the wild type but not the mutant UVR8 and COP1 proteins directly interact in a UV-B-dependent, rapid manner in planta. These data collectively suggest that UV-B-specific interaction of COP1 and UVR8 in the nucleus is a very early step in signalling and responsible for the plant's coordinated response to UV-B ensuring UV-B acclimation and protection in the natural environment.
Keywords AcclimatizationArabidopsis/physiologyArabidopsis Proteins/genetics/physiologyChromosomal Proteins, Non-Histone/genetics/physiologyGene Expression Regulation, PlantHypocotyl/growth & development/physiologyMutationProtein BindingSignal Transduction/physiologyStress, PhysiologicalSunlightUltraviolet Rays
PMID: 19165148
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FAVORY, Jean-Jacques et al. Interaction of COP1 and UVR8 regulates UV-B-induced photomorphogenesis and stress acclimation in Arabidopsis. In: EMBO journal, 2009, vol. 28, n° 5, p. 591-601. doi: 10.1038/emboj.2009.4

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Deposited on : 2012-03-30

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