Ligand regulation of a constitutively dimeric EGF receptor.

Ligand regulation of a constitutively dimeric EGF receptor.
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DOI:
10.1038/ncomms8380
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发表时间:
2015-06-10
影响因子:
16.6
通讯作者:
Lemmon, Mark A.
Lemmon, Mark A.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Freed, Daniel M.;Alvarado, Diego;Lemmon, Mark A.

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配体诱导的受体二聚化传统上被认为是表皮生长因子受体(EGFR)跨膜信号转导的关键事件。在这里,我们表明秀丽隐杆线虫EGFR直向同源物LET-23是组成型二聚体,但响应其配体LIN-3而不改变寡聚化状态。SAXS和突变分析进一步揭示了LET-23胞外区的预形成二聚体由其结构域II二聚化臂介导,并且类似于结构研究中观察到的其他EGFR胞外二聚体。LIN-3的结合仅诱导LET-23二聚体中的微小结构重排以促进信号传导。因此,我们的研究结果表明,EGFR可以调节变构变化内现有的受体二聚体类似的信号传导的胰岛素受体家族成员,共享相似的胞外结构域组成,但形成共价二聚体。 尽管表皮生长因子诱导的二聚化被认为是EGFR信号传导所必需的,但结构相关的胰岛素受体是二硫键连接的二聚体。在这里,作者表明,C。Elegans EGFR是组成型二聚体,并且在配体结合时经历细微的结构变化,这可能是变构活化的基础。
Ligand-induced receptor dimerization has traditionally been viewed as the key event in transmembrane signalling by epidermal growth factor receptors (EGFRs). Here we show that the Caenorhabditis elegans EGFR orthologue LET-23 is constitutively dimeric, yet responds to its ligand LIN-3 without changing oligomerization state. SAXS and mutational analyses further reveal that the preformed dimer of the LET-23 extracellular region is mediated by its domain II dimerization arm and resembles other EGFR extracellular dimers seen in structural studies. Binding of LIN-3 induces only minor structural rearrangements in the LET-23 dimer to promote signalling. Our results therefore argue that EGFR can be regulated by allosteric changes within an existing receptor dimer—resembling signalling by insulin receptor family members, which share similar extracellular domain compositions but form covalent dimers. Whereas epidermal growth factor-induced dimerization is considered essential for EGFR signalling, the structurally related insulin receptor is a disulfide-linked dimer. Here the authors show that C. elegans EGFR is constitutively dimeric and undergoes subtle structural changes upon ligand binding that likely underlie allosteric activation.
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