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Updated: Jun 2, 2026

Luciferase Complementation Imaging Assay in Nicotiana benthamiana Leaves for Transiently Determining Protein-protein Interaction Dynamics
Published on: November 20, 2017
Light-regulated interactions with SPA proteins underlie cryptochrome-mediated gene expression
Christian Fankhauser1, Roman Ulm
1Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland. christian.fankhauser@unil.ch
Light-activated cryptochromes (blue-light photoreceptors) interact with E3 ubiquitin ligase complexes. This interaction regulates the abundance of transcriptional regulators, linking light perception to gene expression control in plants.
Area of Science:
- Plant biology
- Molecular biology
- Photobiology
Background:
- Cryptochromes are blue-light photoreceptors essential for plant development and gene regulation.
- The precise molecular mechanisms linking cryptochrome photoactivation to downstream gene expression changes are not fully understood.
Purpose of the Study:
- To elucidate the molecular pathway by which light-activated cryptochromes influence gene expression.
- To identify the protein interactions mediating cryptochrome signaling.
Main Methods:
- Investigated the interaction between light-activated Arabidopsis cryptochromes and components of E3 ubiquitin ligase complexes.
- Analyzed the impact of these interactions on the abundance of transcriptional regulators.
Main Results:
- Demonstrated that light-activated cryptochromes interact with regulatory components of E3 ubiquitin ligase complexes.
- Showed that this interaction leads to environmentally controlled abundance of specific transcriptional regulators.
Conclusions:
- The interaction between activated cryptochromes and E3 ubiquitin ligase complexes is a key mechanism for light-regulated gene expression.
- This pathway provides a direct link between light perception and the modulation of transcriptional regulator levels.
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Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
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Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...