Interactions of the EphA2 Kinase Domain with PIPs in Membranes: Implications for Receptor Function.

Interactions of the EphA2 Kinase Domain with PIPs in Membranes: Implications for Receptor Function.
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DOI:
10.1016/j.str.2018.05.003
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发表时间:
2018-07-03
期刊:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Sansom MSP
Sansom MSP
中科院分区:
其他
文献类型:
--
作者:
Chavent M;Karia D;Kalli AC;Domański J;Duncan AL;Hedger G;Stansfeld PJ;Seiradake E;Jones EY;Sansom MSP

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EphA2是酪氨酸激酶受体家族的一员。EphA2细胞质区与细胞膜的相互作用在功能上很重要,但尚未完全表征。分子动力学模拟结合生化研究揭示了跨膜、近膜(JM)和激酶结构域与膜的相互作用。我们描述了激酶结构域如何相对于膜定向,以及JM区域如何调节这种相互作用。我们强调了磷脂酰肌醇磷酸(PIPs)在介导激酶结构域与膜的相互作用中的作用,以及相反,激酶表面和JM区域的带正电荷的斑块如何诱导膜中PIP分子纳米团簇的形成。将这些结果与先前的研究结果相结合,可以计算重建膜内接近完整的EphA2受体,表明受体-脂质相互作用在调节EphA2中的作用。分子模拟揭示EphA2激酶如何与膜中的PIP2相互作用EphA2近膜(JM)结构域与激酶结构域和膜相互作用JM和激酶结构域驱动膜中PIP2纳米簇的形成综合模型支持EphA2s簇内的反式自磷酸化,Chavent等研究了EphA2受体酪氨酸激酶与膜的相互作用。磷脂酰肌醇磷酸(PIPs)介导激酶结构域与膜的相互作用,而激酶和近膜结构域诱导PIP分子纳米簇的形成。这些结果使得计算重建一个接近完整的EphA2受体模型成为可能。
EphA2 is a member of the receptor tyrosine kinase family. Interactions of the cytoplasmic region of EphA2 with the cell membrane are functionally important and yet remain incompletely characterized. Molecular dynamics simulations combined with biochemical studies reveal the interactions of the transmembrane, juxtamembrane (JM), and kinase domains with the membrane. We describe how the kinase domain is oriented relative to the membrane and how the JM region can modulate this interaction. We highlight the role of phosphatidylinositol phosphates (PIPs) in mediating the interaction of the kinase domain with the membrane and, conversely, how positively charged patches at the kinase surface and in the JM region induce the formation of nanoclusters of PIP molecules in the membrane. Integration of these results with those from previous studies enable computational reconstitution of a near complete EphA2 receptor within a membrane, suggesting a role for receptor-lipid interactions in modulation of EphA2. Molecular simulations unravel how EphA2 kinase interacts with PIP2 in membranes The EphA2 juxtamembrane (JM) domain interacts with the kinase domain and membrane The JM and kinase domains drive formation of PIP2 nanoclusters in the membrane An integrative model supports trans autophosphorylation within clustered EphA2s Chavent et al. investigate interactions of the EphA2 receptor tyrosine kinase with a membrane. Phosphatidylinositol phosphates (PIPs) mediate interaction of the kinase domain with the membrane, while kinase and juxtamembrane domains induce formation of nanoclusters of PIP molecules. These results enable computational reconstitution of a near complete EphA2 receptor model.
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