The extracellular domain of fibroblast growth factor receptor 3 inhibits ligand-independent dimerization.

The extracellular domain of fibroblast growth factor receptor 3 inhibits ligand-independent dimerization.
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DOI:
10.1126/scisignal.2001195
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发表时间:
2010-11-30
期刊:
影响因子:
7.3
通讯作者:
Hristova K
Hristova K
中科院分区:
生物学1区
文献类型:
--
作者:
Chen L;Placone J;Novicky L;Hristova K

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配体非依赖性受体酪氨酸激酶(RTK)二聚化(其是RTK活化的第一步)的失调导致病理。缺乏对二聚化过程的机械理解,这种基础知识的缺乏是开发有效RTK靶向疗法的一个瓶颈。例如,不同RTK结构域对RTK二聚化的作用和相对贡献是未知的。在这里,我们使用定量成像Förster共振能量转移(QI-FRET)来确定成纤维细胞生长因子受体3(FGFR 3)的细胞外(EC)结构域对FGFR 3二聚化的贡献。我们提供了第一个直接的实验证据,即FGFR 3 EC结构域对二聚化的贡献在不存在配体的情况下是排斥性的,并且在1千卡/摩尔的数量级上。这种排斥作用的大小类似于由于致病性单氨基酸突变而可能发生的二聚体过度稳定化,因此对生物学功能具有重要意义。
Dysregulation of ligand-independent receptor tyrosine kinase (RTK) dimerization, which is the first step in RTK activation, leads to pathologies. A mechanistic understanding of the dimerization process is lacking, and this lack of basic knowledge is one bottleneck in developing effective RTK-targeted therapies. For instance, the roles and the relative contributions of the different RTK domains to RTK dimerization are unknown. Here we use quantitative imaging Förster resonance energy transfer (QI-FRET) to determine the contribution of the extracellular (EC) domain of fibroblast growth factor receptor 3 (FGFR3) to FGFR3 dimerization. We provide the first direct experimental evidence that the contribution of FGFR3 EC domain to dimerization is repulsive in the absence of ligand, and on the order of 1 kcal/mole. The magnitude of this repulsive contribution is similar to the dimer over-stabilization that can occur due to pathogenic single amino acid mutations, and therefore significant for biological function.
DOI: 10.1073/pnas.83.17.6258
发表时间: 1986-09-01
影响因子: 11.1
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通讯作者: METZGER, H
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发表时间: 2009-06-03
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