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Phytochrome B and AGB1 Coordinately Regulate Photomorphogenesis by Antagonistically Modulating PIF3 Stability in Arabidopsis

查看全文 作　　者：Pengbo [1,5]Xu;Hongli [2,5]Lian;Feng [3]Xu;Ting [1]Zhang;Sheng [1]Wang;Wenxiu [4]Wang;Shasha [3]Du;Jirong [4]Huang;Hong-Quan [4]Yang 高影响力作者 机构地区：[1]School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China;[2]School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China;[3]State Key Laboratory of Genetic Engineering, Collaborative Innovation Center for Genetics and Development, School of Life Sciences, Fudan University, Shanghai 200438, China;[4]Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai 200234, China;[5]These authors contributed equally to this article.高影响力机构 出　　处：《Molecular Plant》索引2019年第12卷第2期,共19页高影响力期刊 基　　金：The National Natural Science Foundation of China grants to H.-Q.Y.(31530085) and H.L.L (31570282 and 31170266);The National Key Research and Development Program of China grant (2017YFA0503802);the Science and Technology Commission of Shanghai Municipality grant (18DZ2260500). 摘　　要：Phytochrome B (phyB), the primary red light photoreceptor, promotes photomorphogenesis in Arabidopsis by interacting with the basic helix-loop-helix transcriptional factor PIF3 and inducing its phosphorylation and degradation. Heterotrimeric G proteins are known to regulate various developmental processes in plants and animals. In Arabidopsis, the G-protein β subunit AGB1 is known to repress photomorphogenesis. However, whether and how phyB and AGB1 coordinately regulate photomorphogenesis are largely unknown. Here we show that phyB physically interacts with AGB1 in a red light-dependent manner and that AGB1 interacts directly with PIF3. Moreover, we demonstrate that the AGB1-PIF3 interaction inhibits the association of PIF3 with phyB, leading to reduced phosphorylation and degradation of PIF3, whereas the phyB-AGB1 interaction represses the association of PIF3 with AGB1, resulting in enhaneed phosphorylation and degradation of PIF3. Our results suggest that phyB and AGB1 antagonistically regulate PIF3 stability by dynamically interacting with each other and PIF3. This dynamic mechanism may allow plants to balanee phyB and G-protein signaling to optimize photomorphogenesis. 关 键 词：ARABIDOPSIS PHYTOCHROME B heterotrimeric G-PROTEIN β sub unit AGB1 PIF3 PHOTOMORPHOGENESIS protein STABILITY
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