A phosphorylation switch turns a positive regulator of phototropism into an inhibitor of the process
| Autor: | Paolo Schumacher, Emilie Demarsy, Patrice Waridel, Laure Allenbach Petrolati, Martine Trevisan, Christian Fankhauser |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
animal structures
Light Arabidopsis Proteins Science fungi Arabidopsis Intracellular Signaling Peptides and Proteins food and beverages Dose-Response Relationship Radiation Protein Serine-Threonine Kinases Phosphoproteins Plants Genetically Modified Adaptation Physiological Gene Expression Regulation Plant bacteria lcsh:Q sense organs Phosphorylation lcsh:Science Phototropism Adaptation Physiological/genetics Adaptation Physiological/radiation effects Arabidopsis/genetics Arabidopsis/metabolism Arabidopsis/radiation effects Arabidopsis Proteins/genetics Arabidopsis Proteins/metabolism Gene Expression Regulation Plant/radiation effects Intracellular Signaling Peptides and Proteins/genetics Intracellular Signaling Peptides and Proteins/metabolism Phosphoproteins/genetics Phosphoproteins/metabolism Phosphorylation/radiation effects Phototropism/genetics Phototropism/radiation effects |
| Zdroj: | Nature Communications, Vol 9, Iss 1, Pp 1-9 (2018) Nature communications, vol. 9, no. 1, pp. 2403 |
| ISSN: | 2041-1723 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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