Abstract
Light is an essential environmental cue that determines the overall growth and development of plants. However, the molecular mechanisms underpinning the light signaling network are obscured by the epigenetic machinery where reversible acetylation and deacetylation play crucial roles in modulating light-regulated gene expression. In this paper, we demonstrate that HDA15 represses COP1, the master switch in the light signaling network, by deacetylation, protein interaction, and sub-compartmentalization. hda15 T-DNA mutant lines exhibited light hyposensitivity with significantly reduced HY5 and PIF3 transcript levels leading to long-hypocotyl phenotypes in the dark while its overexpression exhibited elevated HY5 transcripts and short hypocotyl phenotypes. In vivo and in vitro binding assays further show that HDA15 directly interacts with COP1 inside the nucleus modulating COP1’s repressive activities. Crossing hda15-t27 with cop1-4 mutants resulted in short-hypocotyl and dwarfed phenotypes, reminiscent of cop1-4 mutants suggesting COP1 is epistatic to HDA15. Although light signals the nucleocytoplasmic shuttling of HDA15, the presence of COP1 triggers its nuclear localization. A working model is presented elucidating the concerted interplay between HDA15 and COP1 under light and dark conditions.
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The data supporting the findings of this study are available in the paper and from the corresponding author, MVA, upon request.
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Acknowledgements
The authors are grateful to the unwavering support of the various laboratory professors, mentors, colleagues, and staff for the conduct of this research. Special mention goes to Prof. Keqiang Wu and Prof. Hsu-Liang Hsieh of NTU and Prof. Jeong Joo Cheong of SNU for their guidance and access to their facilities. MVA is equally indebted to the scholarship and research fellowship grants funded by the Democratic Pacific Union, National Science Council of Taiwan, National Taiwan University, and Seoul National University.
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This work was supported by the Democratic Pacific Union PhD studentship and research fellowship grants from the National Science Council of Taiwan, National Taiwan University, and Seoul National University to MVA.
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Both authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by MVA and CCD. The first draft of the manuscript was written by MVA and CCD commented on previous versions of the manuscript. Both authors read and approved the final manuscript.
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Alinsug, M.V., Deocaris, C.C. AtHDA15 attenuates COP1 via transcriptional quiescence, direct binding, and sub-compartmentalization during photomorphogenesis. Plant Growth Regul 101, 145–158 (2023). https://doi.org/10.1007/s10725-023-01008-x
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DOI: https://doi.org/10.1007/s10725-023-01008-x