A phosphorylation switch turns a positive regulator of phototropism into an inhibitor of the process.

Details

Serval ID
serval:BIB_1E557139C580
Type
Article: article from journal or magazin.
Collection
Publications
Title
A phosphorylation switch turns a positive regulator of phototropism into an inhibitor of the process.
Journal
Nature communications
Author(s)
Schumacher P., Demarsy E., Waridel P., Petrolati L.A., Trevisan M., Fankhauser C.
ISSN
2041-1723 (Electronic)
ISSN-L
2041-1723
Publication state
Published
Issued date
19/06/2018
Peer-reviewed
Oui
Volume
9
Number
1
Pages
2403
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: epublish
Abstract
Phototropins are light-activated protein kinases, which contribute to photosynthesis optimization both through enhancement of photon absorption when light is limiting and avoidance responses in high light. This duality is in part endowed by the presence of phototropins with different photosensitivity (phot1 and phot2). Here we show that phot1, which senses low light to promote positive phototropism (growth towards the light), also limits the response in high light. This response depends in part on phot1-mediated phosphorylation of Phytochrome Kinase Substrate 4 (PKS4). This light-regulated phosphorylation switch changes PKS4 from a phototropism enhancer in low light to a factor limiting the process in high light. In such conditions phot1 and PKS4 phosphorylation prevent phototropic responses to shallow light gradients and limit phototropism in a natural high light environment. Hence, by modifying PKS4 activity in high light the phot1-PKS4 regulon enables appropriate physiological adaptations over a range of light intensities.
Keywords
Adaptation, Physiological/genetics, Adaptation, Physiological/radiation effects, Arabidopsis/genetics, Arabidopsis/metabolism, Arabidopsis/radiation effects, Arabidopsis Proteins/genetics, Arabidopsis Proteins/metabolism, Dose-Response Relationship, Radiation, Gene Expression Regulation, Plant/radiation effects, Intracellular Signaling Peptides and Proteins/genetics, Intracellular Signaling Peptides and Proteins/metabolism, Light, Phosphoproteins/genetics, Phosphoproteins/metabolism, Phosphorylation/radiation effects, Phototropism/genetics, Phototropism/radiation effects, Plants, Genetically Modified
Pubmed
Web of science
Open Access
Yes
Create date
09/07/2018 17:53
Last modification date
21/08/2019 6:33
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