Published December 8, 2023
| Version v1
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Light-induced LLPS of the CRY2/SPA1/FIO1 complex regulating mRNA methylation and chlorophyll homeostasis in Arabidopsis
Creators
- 1. University of Chicago
- 2. Fujian Agriculture and Forestry University
- 3. University of California, Riverside
Description
Light regulates chlorophyll homeostasis and photosynthesis via various molecular mechanisms in plants. The light regulation of transcription and protein stability of nuclear-encoded chloroplast proteins have been extensively studied, but how light regulation of mRNA metabolism affects abundance of nuclear-encoded chloroplast proteins and chlorophyll homeostasis remains poorly understood. Here we show that the blue light receptor cryptochrome 2 (CRY2) and the METTL16-type m6A writer FIONA1 (FIO1) regulate chlorophyll homeostasis in response to blue light. In contrast to the CRY2-mediated photo-condensation of the mRNA adenosine methylase (MTA), photoexcited CRY2 co-condenses FIO1 only in the presence of the CRY2-signalling protein SUPPRESSOR of PHYTOCHROME A (SPA1). CRY2 and SPA1 synergistically or additively activate the RNA methyltransferase activity of FIO1 in vitro, whereas CRY2 and FIO1, but not MTA, are required for the light-induced methylation and translation of the mRNAs encoding multiple chlorophyll homeostasis regulators in vivo. Our study demonstrates that the light-induced liquid–liquid phase separation of the photoreceptor/writer complexes is commonly involved in the regulation of photoresponsive changes of mRNA methylation, whereas the different photo-condensation mechanisms of the CRY/FIO1 and CRY/MTA complexes explain, at least partially, the writer-specific functions in plant photomorphogenesis.
Data availability
The raw data of transcriptomes, m6A epitranscriptomes and translatomes reported in this paper are available at GEO database with accession numbers GSE226927 and GSE227150. The MS proteomics data have been deposited to the ProteomeXchange Consortium with the dataset identifier PXD040660.Files
Light-induced-LLPS-of-the-CRY2-SPA1-FIO1-complex.pdf
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Additional details
Identifiers
- DOI
- 10.1038/s41477-023-01580-0
- Other
- oai:uchicago.tind.io:10178
Related works
- Is supplement to
- https://doi.org/10.1038/s41477-023-01613-8 (URL)
Funding
- Natural Science Foundation of China
- 32330009
- Fujian Agriculture and Forestry University Research Fund
- UCLA
- Sol Leshin Program
- Young Taishan Scholars Program
- Shandong Provincial Natural Science Fund
- Excellent Young Scientists Fund Program
- Pritzker Organization