Alpha-adducin dissociates from F-actin and spectrin during platelet activation.

Alpha-adducin dissociates from F-actin and spectrin during platelet activation.
复制标题

DOI:
10.1083/jcb.200211122
复制
发表时间:
2003-05-12
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Hartwig JH
Hartwig JH
中科院分区:
其他
文献类型:
--
作者:
Barkalow KL;Italiano JE Jr;Chou DE;Matsuoka Y;Bennett V;Hartwig JH

文献摘要

参考文献

被引文献

相似文献

基于血影蛋白的骨架均匀地位于静息血小板的质膜之下并支持其,但在活化的血小板中重塑并集中。α-内收蛋白是一种与F-肌动蛋白和血影蛋白形成三元复合物的磷蛋白,在静止血小板的膜骨架中,在肌动蛋白丝附着于血影蛋白分子末端的位点,α-内收蛋白被去磷酸化并主要与血影蛋白结合。通过蛋白酶激活受体1 FcγRIIA或PMA处理使Ser 726磷酸化内收蛋白激活血小板。磷酸内收蛋白从膜骨架释放,同时与血影蛋白和肌动蛋白解离。PKC的抑制减弱了内收蛋白磷酸化和从血影蛋白和肌动蛋白的释放,防止了通常伴随细胞活化的血影蛋白的集中。我们的结论是,内收蛋白的目标肌动蛋白丝结束血影蛋白完成组装的休息膜骨架。磷酸内收蛋白的解离从肌动蛋白释放血影蛋白,促进血影蛋白的集中化,并导致有倒钩的肌动蛋白丝末端的暴露,其然后可以参与将静息血小板的圆盘形状转化为其活性形式。
Aspectrin-based skeleton uniformly underlies and supports the plasma membrane of the resting platelet, but remodels and centralizes in the activated platelet. α-Adducin, a phosphoprotein that forms a ternary complex with F-actin and spectrin, is dephosphorylated and mostly bound to spectrin in the membrane skeleton of the resting platelet at sites where actin filaments attach to the ends of spectrin molecules. Platelets activated through protease-activated receptor 1, FcγRIIA, or by treatment with PMA phosphorylate adducin at Ser726. Phosphoadducin releases from the membrane skeleton concomitant with its dissociation from spectrin and actin. Inhibition of PKC blunts adducin phosphorylation and release from spectrin and actin, preventing the centralization of spectrin that normally follows cell activation. We conclude that adducin targets actin filament ends to spectrin to complete the assembly of the resting membrane skeleton. Dissociation of phosphoadducin releases spectrin from actin, facilitating centralization of spectrin, and leads to the exposure of barbed actin filament ends that may then participate in converting the resting platelet's disc shape into its active form.
DOI: 10.1074/jbc.273.30.19329
发表时间: 1998-07-24
影响因子: 4.8
作者:
Li, XL;Matsuoka, Y;Bennett, V
通讯作者: Bennett, V
DOI: 10.1083/jcb.118.6.1421
发表时间: 1992-09
期刊: The Journal of cell biology
影响因子: --
作者:
Hartwig JH
通讯作者: Hartwig JH
DOI: 10.1016/s0960-9822(01)00629-7
发表时间: 2002-01-08
期刊: CURRENT BIOLOGY
影响因子: 9.2
作者:
Ichetovkin, I;Grant, W;Condeelis, J
通讯作者: Condeelis, J
DOI: 10.1038/328359a0
发表时间: 1987-07-23
期刊: NATURE
影响因子: 64.8
作者:
GARDNER, K;BENNETT, V
通讯作者: BENNETT, V
DOI: 10.1083/jcb.142.2.485
发表时间: 1998-07-27
期刊: The Journal of cell biology
影响因子: --
作者:
Matsuoka Y;Li X;Bennett V
通讯作者: Bennett V