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
中科院分区:
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
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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影响因子:
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通讯作者:
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影响因子:
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