A conserved face of the Jagged/Serrate DSL domain is involved in Notch trans-activation and cis-inhibition.

A conserved face of the Jagged/Serrate DSL domain is involved in Notch trans-activation and cis-inhibition.
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DOI:
10.1038/nsmb.1457
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发表时间:
2008-08
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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--
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Notch受体及其配体是核心后生动物信号通路的关键组成部分,该通路调节许多细胞命运决定的空间模式、时间和结果。配体含有一个富含二硫化物的Delta/Serrate/Lag-2(DSL)结构域,是Notch反式激活或顺式抑制所必需的。在这里,我们报道了Notch配体的一个功能片段的第一个X射线结构,即人Jagge-1的DSL-EGF3结构域(J-1DSL-EGF3)。该结构确定了DSL结构域的一个高度保守的表面,通过对果蝇配体突变体的功能分析,我们表明这个表面是与Notch顺式和反式调节相互作用所必需的。我们还利用核磁共振技术鉴定了参与J-1DSL-EGF3结合的Notch-1表面。我们的数据表明,顺式和反式调节可能通过形成结构不同的复合体来发生,这些复合体出人意料地涉及到配体和受体上的相同表面。
The Notch receptor and its ligands are key components in a core metazoan signalling pathway which regulates the spatial patterning, timing and outcome of many cell-fate decisions. Ligands contain a disulphide-rich Delta/Serrate/LAG-2 (DSL) domain required for Notch trans-activation or cis-inhibition. Here we report the first X-ray structure of a functional fragment of a Notch ligand, the DSL-EGF3 domains of human Jagged-1 (J-1DSL-EGF3). The structure identifies a highly conserved face of the DSL domain and we show, by functional analysis of Drosophila ligand mutants, that this surface is required for both cis- and trans-regulatory interactions with Notch. We also identify, using NMR, a surface of Notch-1 involved in J-1DSL-EGF3 binding. Our data imply that cis- and trans-regulation may occur through formation of structurally distinct complexes which, unexpectedly, involve the same surfaces on both ligand and receptor.
DOI: 10.1101/gad.4.12a.2188
发表时间: 1990-12-01
影响因子: 10.5
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