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BPH1, a novel substrate receptor of CRL3, plays a repressive role in ABA signal transduction

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BPH1 acts as a substrate receptor of CRL3 complex and negatively regulates ABA-mediated cellular responses. The study on its function provides information that helps further understand the relationship between ABA signaling and UPS.

Abstract

Abscisic acid (ABA) plays a crucial role in a variety of cellular processes, including seed dormancy, inhibition of seedling growth, and drought resistance in plants. Cullin3-RING E3 ligase (CRL3) complex is a type of multi-subunit E3 ligase, and BTB/POZ protein, a component of CRL3 complex, functions as a receptor to determine a specific substrate. To elucidate the CRL3 complex that participates in ABA-mediated cellular processes, we first investigated ABA-inducible BTB/POZ genes based on data from the AtGenExpress Visualization Tool (AVT). We then isolated an ABA-inducible gene encoding a potential CRL3 substrate receptor in Arabidopsis, BPH1 (BTB/POZ protein hypersensitive to ABA 1). The isolate gene has a BTB/POZ domain and a NPH3 domain within its N-terminal and C-terminal region, respectively. Yeast two-hybrid and co-immunoprecipitation assays showed that BPH1 physically interacted with cullin3a, a scaffold protein of CRL3, suggesting that it functions as an Arabidopsis CRL3 substrate receptor. The functional mutation of BPH1 caused delayed seed germination in response to ABA and enhanced sensitivity by NaCl and mannitol treatments as ABA-related stresses. Moreover, bph1 mutants exhibited enhanced stomatal closure under ABA application and reduced water loss when compared with wild-type, implying their enhanced tolerance to drought stress. Based on the information from microarray/AVT data and expression analysis of various ABA-inducible genes between wild-type and bph1 plants following ABA treatments, we concluded loss of BPH1 resulted in hyper-induction of a large portion of ABA-inducible genes in response to ABA. Taken together, these results show that BPH1 is negatively involved in ABA-mediated cellular events.

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Acknowledgements

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2016R1D1A1B03930213), by Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry and Fisheries (IPET) through Agri-Bio industry Technology Development Program funded by Ministry of Agriculture, Food and Rural Affairs (MAFRA) (115081-2), and by the Strategic Initiative for Microbiomes in Agriculture and Food, Ministry of Agriculture, Food and Rural Affairs, Republic of Korea (916007021HD040).

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J-HL designed the research and analyzed the data. O-GW and S-HK carried out the experimental work and analyzed the data. SKC, S-HK and HNL carried out the experimental work. O-GW, SKC, HNL, TC, SWY and J-HL revised the manuscript. TC and SWY provided reagents and materials for the revision process, and analyzed the data. J-HL wrote the manuscript with contributions of authors TC and SWY.

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Correspondence to Jae-Hoon Lee.

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Woo, OG., Kim, SH., Cho, S.K. et al. BPH1, a novel substrate receptor of CRL3, plays a repressive role in ABA signal transduction. Plant Mol Biol 96, 593–606 (2018). https://doi.org/10.1007/s11103-018-0717-x

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