Abstract
Plant development requires coordination among complex signaling networks to enhance the plant's adaptation to changing environments. DELLAs, transcription regulators originally identified as repressors of phytohormone gibberellin signaling, play a central role in integrating multiple signaling activities via direct protein interactions with key transcription factors. Here, we found that DELLA is mono-O-fucosylated by the novel O-fucosyltransferase SPINDLY (SPY) in Arabidopsis thaliana. O-fucosylation activates DELLA by promoting its interaction with key regulators in brassinosteroid- and light-signaling pathways, including BRASSINAZOLE-RESISTANT1 (BZR1), PHYTOCHROME-INTERACTING-FACTOR3 (PIF3) and PIF4. Moreover, spy mutants displayed elevated responses to gibberellin and brassinosteroid, and increased expression of common target genes of DELLAs, BZR1 and PIFs. Our study revealed that SPY-dependent protein O-fucosylation plays a key role in regulating plant development. This finding may have broader importance because SPY orthologs are conserved in prokaryotes and eukaryotes, thus suggesting that intracellular O-fucosylation may regulate a wide range of biological processes in diverse organisms.
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Acknowledgements
We thank C. Toleman for assistance with in vitro enzyme assays and G. Dubay at Duke Chemistry Instrument Facilities for help with the MALDI–MS analysis. We also thank Z.-M. Pei and J. Siedow for helpful comments on the manuscript. This work was supported by the National Institutes of Health (R01 GM100051 to T.-p.S.; R01 GM037537 to D.F.H.), the National Science Foundation (MCB-0923723 to T.-p.S.; MCB-0516690, MCB-0820666 and MCB-1158089 to N.E.O.), the Department of Energy (DE-SC0014077 to T.-p.S.) and the US Department of Agriculture (2014-67013-21548 to T.-p.S.).
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R.Z., N.S. and T.-p.S. conceived and designed the research project. R.Z., N.S., W.-P.H. and J.H. performed molecular biology and biochemical analysis; R.Z., N.S., P.Z. and T.-p.S. analyzed data. B.B. performed LC–ETD–MS/MS analysis, and B.B., J.S. and D.F.H. analyzed MS data. P.Z. also provided advice on protein purification and structure modeling. M.B. provided reagents and advice for in vitro enzyme assays with MALDI–MS; N.E.O. provided experimental materials and shared unpublished results. R.Z., N.S. and T.-p.S. wrote the manuscript.
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Zentella, R., Sui, N., Barnhill, B. et al. The Arabidopsis O-fucosyltransferase SPINDLY activates nuclear growth repressor DELLA. Nat Chem Biol 13, 479–485 (2017). https://doi.org/10.1038/nchembio.2320
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DOI: https://doi.org/10.1038/nchembio.2320
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