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Tytuł pozycji:

Conditional involvement of constitutive photomorphogenic1 in the degradation of phytochrome A

Tytuł :
Conditional involvement of constitutive photomorphogenic1 in the degradation of phytochrome A
Autorzy :
Debrieux, D.
Trevisan, M.
Fankhauser, C.
Pokaż więcej
Temat :
Mutation/genetics
Seedlings/radiation effects
Ubiquitin-Protein Ligases/metabolism
Arabidopsis/genetics
RNA, Messenger/metabolism
RNA, Messenger/genetics
Arabidopsis Proteins/genetics
Cullin Proteins/metabolism
Arabidopsis/drug effects
Proteolysis/drug effects
Seedlings/metabolism
Gene Expression Regulation, Plant/drug effects
Sucrose/pharmacology
fungi
Arabidopsis/metabolism
Arabidopsis/radiation effects
Gene Expression Regulation, Plant/radiation effects
Arabidopsis Proteins/metabolism
Phytochrome A/genetics
Proteolysis/radiation effects
Seedlings/drug effects
Phytochrome A/metabolism
Źródło :
Plant Physiology 161(4) 2136-2145
Plant Physiology, vol. 161, no. 4, pp. 2136-2145
Rok publikacji :
2013
Kolekcja :
ZENODO
Serveur_academique_lausannois_enriched
ZENODO_enriched
Serveur_academique_lausannois
Oryginalny identyfikator :
pmid: 23391578
Opis pliku :
application/pdf
ISSN :
1532-2548
DOI :
10.1104/pp.112.213280
All higher plants possess multiple phytochrome photoreceptors, with phytochrome A (phyA) being light labile and other members of the family being relatively light stable (phyB-phyE in Arabidopsis [Arabidopsis thaliana]). phyA also differs from other members of the family because it enables plants to deetiolate in far-red light-rich environments typical of dense vegetational cover. Later in development, phyA counteracts the shade avoidance syndrome. Light-induced degradation of phyA favors the establishment of a robust shade avoidance syndrome and was proposed to be important for phyA-mediated deetiolation in far-red light. phyA is ubiquitylated and targeted for proteasome-mediated degradation in response to light. Cullin1 and the ubiquitin E3 ligase CONSTITUTIVE PHOTOMORPHOGENIC1 (COP1) have been implicated in this process. Here, we systematically analyze the requirement of cullins in this process and show that only CULLIN1 plays an important role in light-induced phyA degradation. In addition, the role of COP1 in this process is conditional and depends on the presence of metabolizable sugar in the growth medium. COP1 acts with SUPPRESSOR OF PHYTOCHROME A (SPA) proteins. Unexpectedly, the light-induced decline of phyA levels is reduced in spa mutants irrespective of the growth medium, suggesting a COP1-independent role for SPA proteins.

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