UVR8 disrupts stabilisation of PIF5 by COP1 to inhibit plant stem elongation in sunlight.

Sharma, A., Sharma, B., Hayes, S., Kerner, K., Hoecker, U., Jenkins, G. I. and Franklin, K. A. (2019) UVR8 disrupts stabilisation of PIF5 by COP1 to inhibit plant stem elongation in sunlight. Nature Communications, 10(1), 4417. (doi: 10.1038/s41467-019-12369-1) (PMID:31562307) (PMCID:PMC6764944)

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Abstract

Alterations in light quality significantly affect plant growth and development. In canopy shade, phytochrome photoreceptors perceive reduced ratios of red to far-red light (R:FR) and initiate stem elongation to enable plants to overtop competitors. This shade avoidance response is achieved via the stabilisation and activation of PHYTOCHROME INTERACTING FACTORs (PIFs) which elevate auxin biosynthesis. UV-B inhibits shade avoidance by reducing the abundance and activity of PIFs, yet the molecular mechanisms controlling PIF abundance in UV-B are unknown. Here we show that the UV-B photoreceptor UVR8 promotes rapid PIF5 degradation via the ubiquitin-proteasome system in a response requiring the N terminus of PIF5. In planta interactions between UVR8 and PIF5 are not observed. We further demonstrate that PIF5 interacts with the E3 ligase COP1, promoting PIF5 stabilisation in light-grown plants. Binding of UVR8 to COP1 in UV-B disrupts this stabilisation, providing a mechanism to rapidly lower PIF5 abundance in sunlight.

Item Type:Articles
Additional Information:This work was funded by BBSRC grants BB/M008711/1 and BB/R002045/1 to KAF and GIJ and grant HO2793/3-2 from the Deutsche Forschungsgemeinschaft to U.H. SH was supported by a NERC studentship.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Jenkins, Professor Gareth
Authors: Sharma, A., Sharma, B., Hayes, S., Kerner, K., Hoecker, U., Jenkins, G. I., and Franklin, K. A.
College/School:College of Medical Veterinary and Life Sciences > Institute of Molecular Cell and Systems Biology
Journal Name:Nature Communications
Publisher:Nature Publishing Group
ISSN:2041-1723
ISSN (Online):2041-1723
Copyright Holders:Copyright © 2019 The Authors
First Published:First published in Nature Communications 10(1):4417
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
171466Integrating UV-B Signalling in to Plant Photomorphogenesis NetworksORCA 55007 BISC RA0642Gareth JenkinsBiotechnology and Biological Sciences Research Council (BBSRC)BB/M008711/1MCSB - Plant Sciences