Numerous studies have shown that the nucleosome is a dynamic structure that strongly influences gene expression. Dynamism concerns different nucleosomal characteristics, including position, posttranslational modificat...Numerous studies have shown that the nucleosome is a dynamic structure that strongly influences gene expression. Dynamism concerns different nucleosomal characteristics, including position, posttranslational modifications, and histone composition. Thus, within the nucleosome, canonical histones can be exchanged by histone variant proteins with specific functions--a process known as ‘histone replacement＇. The histone variant H2A.Z has an important function in transcription and, during the last few years, its role in plant development and immune response has become evident. Compiling genetic and biochemical studies from several laboratories has revealed that plants contain a multiprotein complex, similar to the SWR1/SRCAP complex from yeast and animals, involved in H2A.Z deposition. Despite intense research in different organisms, the mechanism by which H2A.Z influences transcription is still unknown. However, recent results from Arabidopsis have shown a strong inverse correlation between H2A.Z and DNA methylation, suggesting that H2A.Z might protect genes from silencing.展开更多
SUPPRESSOR OF OVEREXPRESSION OF CO 1(SOC1)编码MADS-box转录因子,具有诱导植物成花、防止花分生组织过早成熟和调控花器官发育的重要功能,是调控植物开花的整合因子。SOC1转录因子受蛋白或核酸调控,或与其他转录因子形成复合物进入...SUPPRESSOR OF OVEREXPRESSION OF CO 1(SOC1)编码MADS-box转录因子,具有诱导植物成花、防止花分生组织过早成熟和调控花器官发育的重要功能,是调控植物开花的整合因子。SOC1转录因子受蛋白或核酸调控,或与其他转录因子形成复合物进入细胞核,靶向特异开花基因从而调控植物开花,其调控网络十分复杂。本研究主要分析SOC1及其编码蛋白的结构特征,预测SOC1的蛋白互作网络,并阐明SOC1调控植物开花时间的分子机制,SOC1的表达受FT、CO、FLC及其同源基因MAFs、SVP、SPL和AGL24的直接调控,并受DELLA、miR156、miR172、AP2类转录因子、MYC3蛋白及营养物质信号的间接调控,且与AGL24形成二聚体上调下游花分生组织基因LFY的表达来调控植物的开花诱导过程,为今后研究SOC1调控其他植物的开花时间提供参考。展开更多
Flowering involves a transition process from vegetative growth to reproductive development, in which a series of routine changes take place in the shoot apical meristems from metabolic pathway to external phenotype. E...Flowering involves a transition process from vegetative growth to reproductive development, in which a series of routine changes take place in the shoot apical meristems from metabolic pathway to external phenotype. Expression of the genes related to flowering is the foundation for achieving the transition. Environmental factors (such as vernalization and photoperiod) and the growth status of cell itself induce the expression of the specific genes. A lot of achievements have been made recently in gene control for the determination of flowering time. The article reviews some new advances of such researches related to our work and the interesting field.展开更多
文摘Numerous studies have shown that the nucleosome is a dynamic structure that strongly influences gene expression. Dynamism concerns different nucleosomal characteristics, including position, posttranslational modifications, and histone composition. Thus, within the nucleosome, canonical histones can be exchanged by histone variant proteins with specific functions--a process known as ‘histone replacement＇. The histone variant H2A.Z has an important function in transcription and, during the last few years, its role in plant development and immune response has become evident. Compiling genetic and biochemical studies from several laboratories has revealed that plants contain a multiprotein complex, similar to the SWR1/SRCAP complex from yeast and animals, involved in H2A.Z deposition. Despite intense research in different organisms, the mechanism by which H2A.Z influences transcription is still unknown. However, recent results from Arabidopsis have shown a strong inverse correlation between H2A.Z and DNA methylation, suggesting that H2A.Z might protect genes from silencing.
文摘SUPPRESSOR OF OVEREXPRESSION OF CO 1(SOC1)编码MADS-box转录因子,具有诱导植物成花、防止花分生组织过早成熟和调控花器官发育的重要功能,是调控植物开花的整合因子。SOC1转录因子受蛋白或核酸调控,或与其他转录因子形成复合物进入细胞核,靶向特异开花基因从而调控植物开花,其调控网络十分复杂。本研究主要分析SOC1及其编码蛋白的结构特征,预测SOC1的蛋白互作网络,并阐明SOC1调控植物开花时间的分子机制,SOC1的表达受FT、CO、FLC及其同源基因MAFs、SVP、SPL和AGL24的直接调控,并受DELLA、miR156、miR172、AP2类转录因子、MYC3蛋白及营养物质信号的间接调控,且与AGL24形成二聚体上调下游花分生组织基因LFY的表达来调控植物的开花诱导过程,为今后研究SOC1调控其他植物的开花时间提供参考。
文摘Flowering involves a transition process from vegetative growth to reproductive development, in which a series of routine changes take place in the shoot apical meristems from metabolic pathway to external phenotype. Expression of the genes related to flowering is the foundation for achieving the transition. Environmental factors (such as vernalization and photoperiod) and the growth status of cell itself induce the expression of the specific genes. A lot of achievements have been made recently in gene control for the determination of flowering time. The article reviews some new advances of such researches related to our work and the interesting field.
