Simultaneous visualization of the extracellular and cytoplasmic domains of the epidermal growth factor receptor.

Simultaneous visualization of the extracellular and cytoplasmic domains of the epidermal growth factor receptor.
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DOI:
10.1038/nsmb.2092
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发表时间:
2011-08-07
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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据我们所知,没有结构的研究,到目前为止的特点,在一个完整的受体,通过一个单程跨膜结构域的细胞外结构域的构象变化的耦合在胞质结构域的构象变化。在这里,我们研究这种耦合,其意想不到的复杂性,使用近全长表皮生长因子受体(EGFR)和负染色EM。配体化的二聚体EGFR胞外域可以偶联至具有嘌呤活性的、不对称缔合的激酶二聚体和具有嘌呤失活的、对称缔合的激酶二聚体和单体。稳定激酶活性位点的活性或非活性构象的抑制剂,以及激酶二聚体界面和质膜磷酸化位点中的突变,改变了三种激酶缔合状态之间的平衡。这种激活的受体胞外域的一种构象与多个激酶结构域排列的偶联揭示了跨膜信号传导中先前未预料到的复杂性,并促进了跨膜和细胞质环境中受体功能的调节。
To our knowledge, no structural study to date has characterized, in an intact receptor, the coupling of conformational change in extracellular domains through a single-pass transmembrane domain to conformational change in cytoplasmic domains. Here we examine such coupling, and its unexpected complexity, using nearly full-length epidermal growth factor receptor (EGFR) and negative-stain EM. The liganded, dimeric EGFR ectodomain can couple both to putatively active, asymmetrically associated kinase dimers and to putatively inactive, symmetrically associated kinase dimers and monomers. Inhibitors that stabilize the active or inactive conformation of the kinase active site, as well as mutations in the kinase dimer interface and a juxtamembrane phosphorylation site, shift the equilibrium among the three kinase association states. This coupling of one conformation of an activated receptor ectodomain to multiple kinase-domain arrangements reveals previously unanticipated complexity in transmembrane signaling and facilitates regulation of receptor function in the juxtamembrane and cytoplasmic environments.
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影响因子: 5.3
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