ジャーナル: Traffic / 年: 2013 タイトル: Hsc70-induced changes in clathrin-auxilin cage structure suggest a role for clathrin light chains in cage disassembly. 著者: Anna Young / Svetla Stoilova-McPhie / Alice Rothnie / Yvonne Vallis / Phillip Harvey-Smith / Neil Ranson / Helen Kent / Frances M Brodsky / Barbara M F Pearse / Alan Roseman / Corinne J Smith / 要旨: The molecular chaperone, Hsc70, together with its co-factor, auxilin, facilitates the ATP-dependent removal of clathrin during clathrin-mediated endocytosis in cells. We have used cryo-electron ...The molecular chaperone, Hsc70, together with its co-factor, auxilin, facilitates the ATP-dependent removal of clathrin during clathrin-mediated endocytosis in cells. We have used cryo-electron microscopy to determine the 3D structure of a complex of clathrin, auxilin(401-910) and Hsc70 at pH 6 in the presence of ATP, frozen within 20 seconds of adding Hsc70 in order to visualize events that follow the binding of Hsc70 to clathrin and auxilin before clathrin disassembly. In this map, we observe density beneath the vertex of the cage that we attribute to bound Hsc70. This density emerges asymmetrically from the clathrin vertex, suggesting preferential binding by Hsc70 for one of the three possible sites at the vertex. Statistical comparison with a map of whole auxilin and clathrin previously published by us reveals the location of statistically significant differences which implicate involvement of clathrin light chains in structural rearrangements which occur after Hsc70 is recruited. Clathrin disassembly assays using light scattering suggest that loss of clathrin light chains reduces the efficiency with which auxilin facilitates this reaction. These data support a regulatory role for clathrin light chains in clathrin disassembly in addition to their established role in regulating clathrin assembly.
想定した対称性 - 点群: D6 (2回x6回 2面回転対称) アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 34.0 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: MRC, SPIDER, FREALIGN 詳細: The EM map has been sharpened to match a Fourier amplitude profile derived from a model of the hexagonal barrel (the biological unit) created from the crystal structure atomic model pdb ...詳細: The EM map has been sharpened to match a Fourier amplitude profile derived from a model of the hexagonal barrel (the biological unit) created from the crystal structure atomic model pdb id1XI5. Fourier filtered to 30 Angstroms. 使用した粒子像数: 1051