The TATA-box binding protein-associated factor TAF12b facilitates the degradation of type B response regulators to negatively regulate cytokinin signaling

文献类型： 外文期刊

第一作者： Guo, Liu-Ming

作者： Guo, Liu-Ming;Ghanem, Hussein;Qing, Ling;Guo, Liu-Ming;Li, Jing;Qi, Pan-Pan;Wang, Jie-Bing;Zhang, Heng-Mu;Wang, Jie-Bing;Qing, Ling;Qing, Ling

作者机构：

关键词： TATA-box binding protein-associated factor 12b; TBP TAF12b; cytokinin signaling; CK signaling; type; B response regulators; B-RRs; proteasomal degradation

期刊名称：PLANT COMMUNICATIONS （ 影响因子：11.6； 五年影响因子：11.8 ）

ISSN： 2590-3462

年卷期： 2024 年 5 卷 12 期

页码：

收录情况： SCI

摘要： Cytokinins (CKs) are one of the important classes of plant hormones essential for plant growth and development. TATA-box binding protein-associated factor 12b (TAF12b) is involved in CK signaling, but its molecular and biochemical mechanisms are not fully understood. In this study, TAF12b of Nicotiana benthamiana (NbTAF12b) was found to mediate the CK response by directly interacting with type B response regulators (B-RRs), positive regulators of CK signaling, and inhibiting their transcriptional activities. As a transcriptional co-factor, TAF12b specifically facilitated the proteasomal degradation of non-phosphorylated B-RRs by recruiting the KISS ME DEADLY family of F-box proteins. Such interactions between TAF12b and B-RRs also occur in other plant species. Genetic transformation experiments showed that overexpression of NbTAF12b attenuates the CK-hypersensitive phenotype conferred by NbRR1 overexpression. Taken together, these results suggest a conserved mechanism in which TAF12b negatively regulates CK responses by promoting 26S proteasome-mediated B-RR degradation in multiple plant species, providing novel insights into the regulatory network of CK signaling in plants.

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