Spatial localisation of Discoidin Domain Receptor 2 (DDR2) signalling is dependent on its collagen binding and kinase activity.

Spatial localisation of Discoidin Domain Receptor 2 (DDR2) signalling is dependent on its collagen binding and kinase activity.
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DOI:
10.1016/j.bbrc.2018.04.191
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发表时间:
2018-06-18
影响因子:
3.1
通讯作者:
Huang PH
Huang PH
中科院分区:
生物学4区
文献类型:
--
作者:
Luczynski MT;Harrison PT;Lima N;Krasny L;Paul A;Huang PH

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Discoidin 结构域受体 2 (DDR2) 是一种胶原蛋白结合受体酪氨酸激酶,可启动延迟和持续的酪氨酸磷酸化信号传导。为了了解这种独特磷酸化谱的分子基础,我们利用荧光显微镜来绘制胶原蛋白刺激后 DDR2 和酪氨酸磷酸化蛋白的时空定位。我们发现细胞磷酸化蛋白定位于 DDR2 与胶原蛋白接触的界面,而不是早期内体或溶酶体。我们发现 DDR2 定位独立于整合素激活和关键 DDR2 信号效应子 SHC1。结构功能分析表明,胶原蛋白结合或激酶活性缺陷的 DDR2 突变体无法定位到细胞表面,这首次证明了 DDR2 空间定位需要胶原蛋白结合和激酶功能。这项研究为控制 DDR2 在空间和时间上的激活的潜在结构特征提供了新的见解。
Discoidin Domain Receptor 2 (DDR2) is a collagen-binding receptor tyrosine kinase that initiates delayed and sustained tyrosine phosphorylation signalling. To understand the molecular basis of this unique phosphorylation profile, here we utilise fluorescence microscopy to map the spatiotemporal localisation of DDR2 and tyrosine phosphorylated proteins upon stimulation with collagen. We show that cellular phosphorylated proteins are localised to the interface where DDR2 is in contact with collagen and not in the early endosomes or lysosomes. We find that DDR2 localisation is independent of integrin activation and the key DDR2 signalling effector SHC1. Structure-function analysis reveals that DDR2 mutants defective for collagen binding or kinase activity are unable to localise to the cell surface, demonstrating for the first time that both collagen binding and kinase functions are required for spatial localisation of DDR2. This study provides new insights into the underlying structural features that control DDR2 activation in space and time.
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