Structural insights into membrane interaction and caveolar targeting of dynamin-like EHD2.

Structural insights into membrane interaction and caveolar targeting of dynamin-like EHD2.
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DOI:
10.1016/j.str.2013.12.015
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发表时间:
2014-03-04
期刊:
影响因子:
5.7
通讯作者:
Langen, Ralf
Langen, Ralf
中科院分区:
生物学2区
文献类型:
--
作者:
Shah, Claudio;Hegde, Balachandra G.;Moren, Bjorn;Behrmann, Elmar;Mielke, Thorsten;Moenke, Gregor;Spahn, Christian M. T.;Lundmark, Richard;Daumke, Oliver;Langen, Ralf

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动力蛋白相关的含Eps 15同源结构域的蛋白2(EHD 2)是调节小窝动力学的膜重塑ATP酶。在这里,我们建立了一个电子顺磁共振(EPR)的方法来表征膜结合EHD 2的结构特征。我们发现,在螺旋结构域的尖端残基可以插入到膜,并可能通过楔入机制产生膜曲率。使用EPR和X射线晶体学,我们发现N末端在溶液中折叠到GTPase结构域的疏水口袋中,并可以释放到膜中。冷冻电子显微镜表明,N-末端是不必要的EHD 2寡聚成膜锚定支架。相反,我们发现N-末端在调节EHD 2与小窝的靶向和稳定缔合中的功能。我们的数据揭示了一个意想不到的,膜诱导的调节开关EHD 2,并证明了EPR的多功能性,研究结构和功能的发动蛋白超家族蛋白。
The dynamin-related Eps15-homology domain-containing protein 2 (EHD2) is a membrane remodeling ATPase that regulates the dynamics of caveolae. Here, we established an electron paramagnetic resonance (EPR) approach to characterize structural features of membrane-bound EHD2. We show that residues at the tip of the helical domain can insert into the membrane and may create membrane curvature by a wedging mechanism. Using EPR and X-ray crystallography, we found that the N-terminus is folded into a hydrophobic pocket of the GTPase domain in solution and can be released into the membrane. Cryo electron microscopy demonstrated that the N-terminus is not essential for oligomerization of EHD2 into a membrane-anchored scaffold. Instead, we found a function of the N-terminus in regulating targeting and stable association of EHD2 to caveolae. Our data uncover an unexpected, membrane-induced regulatory switch in EHD2 and demonstrate the versatility of EPR to study structure and function of dynamin superfamily proteins.
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