生物
多组蛋白
转录因子
拟南芥
基因沉默
细胞生物学
PRC2
心理压抑
效应器
遗传学
抑制因子
基因表达调控
基因
组蛋白
恶毒的
抄写(语言学)
组蛋白H3
基因表达
同源异型基因
突变体
哲学
语言学
作者
Zhijuan Chen,Jing Lu,X. Li,Danhua Jiang,Zicong Li
标识
DOI:10.1093/plcell/koae287
摘要
Abstract The evolutionarily conserved Polycomb repressive complexes (PRC) mediate genome-wide transcriptional silencing and regulate a plethora of development, as well as environmental responses in multicellular organisms. The PRC2-catalyzed trimethylation of lysine 27 on histone H3 (H3K27me3) is recognized by reader-effector modules of PRC1 to implement gene repression. Here, we report that the Arabidopsis (Arabidopsis thaliana) H3K27me3 effector EMBRYONIC FLOWER 1 (EMF1) interacts with and constrains the R2R3 DNA binding transcription factor MYB26 by a eudicot-conserved motif in the stamen. MYB26 activates the transcription of two NAC domain genes, NAC SECONDARY WALL THICKENING PROMOTING FACTOR1 (NST1) and NST2, whose encoded proteins mediate anther secondary cell thickening in jasmonate (JA)-regulated stamen maturation. In this process, the transcriptional activity of MYB26 is negatively modulated by the JAZ-PRC repressive complex to precisely regulate the expression of NST1 and NST2. Disruption of EMF1 repression stimulates MYB26, leading to the excessive transcription of the two NAC genes and male sterility. Our results reveal a novel mechanism in polycomb-mediated gene silencing and illustrate that the plant Polycomb complex regulates stamen development by preventing the hypersensitivity of JA responses in male reproduction.
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