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Favory, J.J.* ; Stec, A.* ; Gruber, H.* ; Rizzini, L.* ; Oravecz, A.* ; Funk, M.* ; Albert, A. ; Cloix, C.* ; Jenkins, G.I.* ; Oakeley, E.J.* ; Seidlitz, H.K. ; Nagy, F.* ; Ulm, R.*

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

EMBO J. 28, 591-601 (2009)
DOI PMC
Open Access Gold as soon as Publ. Version/Full Text is submitted to ZB.
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 themutant UVR8 and COP1 proteins directly interact in a UVB-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.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Arabidopsis; photomorphogenesis; plant environment interaction; stress acclimation; UV-B; bimolecular fluorescence complementation; signaling component uvr8; protein interactions; c-jun; light; hy5; transcription; plants; transduction; radiation
ISSN (print) / ISBN 0261-4189
e-ISSN 1460-2075
Journal EMBO Journal, The
Quellenangaben Volume: 28, Issue: 5, Pages: 591-601 Article Number: , Supplement: ,
Publisher Wiley
Publishing Place Heidelberg, Germany
Reviewing status Peer reviewed
Institute(s) Research Unit Environmental Simulation (EUS)