Tetramerization of MADS family transcription factors SEPALLATA3 and AGAMOUS is required for floral meristem determinacy in Arabidopsis.

Tetramerization of MADS family transcription factors SEPALLATA3 and AGAMOUS is required for floral meristem determinacy in Arabidopsis.
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DOI:
10.1093/nar/gky205
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发表时间:
2018-06-01
影响因子:
14.9
通讯作者:
Zubieta C
Zubieta C
中科院分区:
生物学2区
文献类型:
--
作者:
Hugouvieux V;Silva CS;Jourdain A;Stigliani A;Charras Q;Conn V;Conn SJ;Carles CC;Parcy F;Zubieta C

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MADS转录因子(TF)是一个古老的TF家族,存在于所有真核生物中,以专性二聚体的形式结合DNA。植物在进化过程中通过向核心DNA结合结构域添加蛋白质-蛋白质相互作用结构域,允许形成异源四聚体复合物,从而极大地扩展了MADS家族的功能多样性。植物MADS转录因子的四聚化被认为是高等植物花形成和花器官特化的主要决定因素之一,在高等植物的进化中起着核心作用。MADS TF,SEPALLATA 3(SEP 3),作为一个中心蛋白质-蛋白质相互作用枢纽,驱动与其他MADS TF的四聚体。在这里,我们使用了一个SEP 3剪接变体,SEP 3 Δ泰特,它具有显着废除四聚化能力,以解耦SEP 3四聚化和DNA结合活性。我们出乎意料地证明,SEP 3异源四聚体的形成所需的正确终止的花分生组织,但在花器官发生中起着较小的作用。SEP 3和MADS蛋白AGAMOUS形成的异源四聚体是激活两个靶基因KNUCKLES和CRABSCLAW所必需的,这两个基因是分生组织决定性所必需的。这些研究揭示了四聚体在花发育中的独特和高度特异性的作用,并表明四聚体可能仅需要激活封闭染色质区域中的靶基因的子集。
The MADS transcription factors (TF) constitute an ancient family of TF found in all eukaryotes that bind DNA as obligate dimers. Plants have dramatically expanded the functional diversity of the MADS family during evolution by adding protein–protein interaction domains to the core DNA-binding domain, allowing the formation of heterotetrameric complexes. Tetramerization of plant MADS TFs is believed to play a central role in the evolution of higher plants by acting as one of the main determinants of flower formation and floral organ specification. The MADS TF, SEPALLATA3 (SEP3), functions as a central protein–protein interaction hub, driving tetramerization with other MADS TFs. Here, we use a SEP3 splice variant, SEP3Δtet, which has dramatically abrogated tetramerization capacity to decouple SEP3 tetramerization and DNA-binding activities. We unexpectedly demonstrate that SEP3 heterotetramer formation is required for correct termination of the floral meristem, but plays a lesser role in floral organogenesis. The heterotetramer formed by SEP3 and the MADS protein, AGAMOUS, is necessary to activate two target genes, KNUCKLES and CRABSCLAW, which are required for meristem determinacy. These studies reveal unique and highly specific roles of tetramerization in flower development and suggest tetramerization may be required to activate only a subset of target genes in closed chromatin regions.
DOI: 10.1093/bioinformatics/btr064
发表时间: 2011-04-01
期刊: Bioinformatics (Oxford, England)
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