Brassinosteroids Regulate Circadian Oscillation via the BES1/TPL-CCA1/LHY Module in Arabidopsis thaliana

Lee, Hong Gil; Won, Jin Hoon; Choi, Yee-Ram; Lee, Kyoung-Hee; Seo, Pil Joon

doi:10.1016/j.isci.2021.103147

Cited by 1 publication

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“…Recent studies have shown that the EAR motif recruits the corepressor TOPLESS to form a transcriptional repressor complex that regulates the expression of downstream genes (Szemenyei et al ., 2008; Pauwels et al ., 2010; Liu et al ., 2018; Zhuang et al ., 2020; Lee et al ., 2021; Li et al ., 2022; Wang et al ., 2022). Therefore, we speculated that MYB22 likely combines with TOPLESS to form a repressor complex.…”

Section: Resultsmentioning

confidence: 99%

A novel transcriptional repressor complex MYB22–TOPLESS–HDAC1 promotes rice resistance to brown planthopper by repressing F3′H expression

Sun

Shen

et al. 2023

New Phytologist

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The brown planthopper (BPH) is the most destructive pest of rice. The MYB transcription factors are vital for rice immunity, but most are activators. Although MYB22 positively regulates rice resistance to BPH and has an EAR motif associated with active repression, it remains unclear whether it is a transcriptional repressor affecting rice-BPH interaction.Genetic analyses revealed that MYB22 regulates rice resistance to BPH via its EAR motif. Several biochemical experiments (e.g. transient transcription assay, Y2H, LCA, and BiFC) indicated that MYB22 is a transcriptional repressor that interacts with the corepressor TOPLESS via its EAR motif and recruits HDAC1 to form a tripartite complex.Flavonoid-3 0 -hydroxylase (F3 0 H) is a flavonoid biosynthesis pathway-related gene that negatively regulates rice resistance to BPH. Based on a bioinformatics analysis and the results of EMSA and transient transcription assays, MYB22 can bind directly to the F3 0 H promoter and repress gene expression along with TOPLESS and HDAC1.We revealed a transcriptional regulatory mechanism influencing the rice-BPH interaction that differs from previously reported mechanisms. Specifically, MYB22-TOPLESS-HDAC1 is a novel transcriptional repressor complex with components that synergistically and positively regulate rice resistance to BPH through the transcriptional repression of F3 0 H.

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