Structure of the SHR-SCR heterodimer bound to the BIRD/IDD transcriptional factor JKD.

Structure of the SHR-SCR heterodimer bound to the BIRD/IDD transcriptional factor JKD.
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DOI:
10.1038/nplants.2017.10
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发表时间:
2017-02-17
期刊:
影响因子:
18
通讯作者:
Hakoshima T
Hakoshima T
中科院分区:
生物学1区
文献类型:
--
作者:
Hirano Y;Nakagawa M;Suyama T;Murase K;Shirakawa M;Takayama S;Sun TP;Hakoshima T

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植物特异性GAI-RGA-and-SCR(GRAS)家族蛋白在植物发育和信号传导中起着关键作用。两个GRAS蛋白,短根(SHR)和SCARECROW(SCR),合作指导不对称细胞分裂和图案的根细胞类型的转录控制结合鸟/INDUSTRIATE域(IDD)转录因子,虽然这些具体的相互作用和行动的精确细节仍然未知。在这里,我们提出了SHR-SCR二元和JKD/IDD 10-SHR-SCR三元复合物的晶体结构。每个GRAS结构域包含一个具有α-螺旋帽的α/β核心亚结构域,其通过形成分子间螺旋束介导异源二聚化。SHR的α/β核心亚结构域形成BIRD结合沟,其特异性识别JKD的锌指。我们在13个BIRD/IDD转录因子中发现了一个保守的SHR结合基序(SHBM)。我们的研究结果建立了GRAS-GRAS和GRAS-BIRD相互作用的结构基础,并为我们了解这些参与植物特异性信号网络的调节因子提供了有价值的线索。
The plant-specific GAI-RGA-and-SCR (GRAS) family proteins play critical roles in plant development and signaling. Two GRAS proteins, SHORT-ROOT (SHR) and SCARECROW (SCR), cooperatively direct asymmetric cell division and the patterning of root cell types by transcriptional control in conjunction with BIRD/INDETERMINATE DOMAIN (IDD) transcription factors, although precise details of these specific interactions and actions remain unknown. Here, we present the crystal structures of the SHR-SCR binary and JKD/IDD10-SHR-SCR ternary complexes. Each GRAS domain comprises one α/β core subdomain with an α-helical cap that mediates hetero-dimerization by forming an intermolecular helix bundle. The α/β core subdomain of SHR forms the BIRD-binding groove, which specifically recognizes the zinc fingers of JKD. We identified a conserved SHR-binding motif (SHBM) in 13 BIRD/IDD transcription factors. Our results establish a structural basis for GRAS-GRAS and GRAS-BIRD interactions and provide valuable clues towards our understanding of these regulators involved in plant-specific signaling networks.
玉米不确定的1开花时间调节剂定义了高等植物中高度保守的锌指蛋白家族。
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