Cell adhesion. The minimal cadherin-catenin complex binds to actin filaments under force.

Cell adhesion. The minimal cadherin-catenin complex binds to actin filaments under force.
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DOI:
10.1126/science.1254211
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发表时间:
2014-10-31
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Dunn AR
Dunn AR
中科院分区:
其他
文献类型:
--
作者:
Buckley CD;Tan J;Anderson KL;Hanein D;Volkmann N;Weis WI;Nelson WJ;Dunn AR

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粘附连接(AJ)和肌动蛋白细胞骨架之间的联系是组织发育和稳态所必需的。体内研究结果表明,AJ蛋白E-钙粘蛋白、β-连环蛋白和丝状(F)-肌动蛋白结合蛋白α E-连环蛋白形成直接结合F-肌动蛋白的最小钙粘蛋白-连环蛋白复合物。生物化学研究挑战了这种模型,因为纯化的钙粘蛋白-连环蛋白复合物在溶液中不结合F-肌动蛋白。在这里,我们调和了这种差异。使用光学陷阱为基础的分析,我们表明,最小的钙粘蛋白-连环蛋白复合物形成稳定的债券与肌动蛋白丝的力量。键解离动力学可以用捕获键模型来解释,在该模型中,力将键从弱结合状态转移到强结合状态。这些结果可能解释了钙粘蛋白-连环蛋白复合物如何在细胞-细胞连接处转导机械力。
Linkage between the adherens junction (AJ) and the actin cytoskeleton is required for tissue development and homeostasis. In vivo findings indicated that the AJ proteins E-cadherin, β-catenin, and the filamentous (F)-actin binding protein αE-catenin form a minimal cadherin-catenin complex that binds directly to F-actin. Biochemical studies challenged this model since the purified cadherin-catenin complex does not bind F-actin in solution. Here we reconciled this difference. Using an optical trap-based assay, we showed that the minimal cadherin-catenin complex formed stable bonds with an actin filament under force. Bond dissociation kinetics can be explained by a catch bond model in which force shifts the bond from a weakly to a strongly bound state. These results may explain how the cadherin-catenin complex transduces mechanical forces at cell-cell junctions.
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