Identification of phosphorylation-induced changes in vimentin intermediate filaments by site-directed spin labeling and electron paramagnetic resonance.

Identification of phosphorylation-induced changes in vimentin intermediate filaments by site-directed spin labeling and electron paramagnetic resonance.
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通过定点自旋标记和电子顺磁共振鉴定波形蛋白中间丝中磷酸化诱导的变化。

DOI:
10.1021/bi801137m
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发表时间:
2008
期刊:
影响因子:
2.9
通讯作者:
Fitzgerald,PaulG
Fitzgerald,PaulG
中科院分区:
生物学3区
文献类型:
--
作者:
Pittenger,JoshT;Hess,JohnF;Budamagunta,MadhuS;Voss,JohnC;Fitzgerald,PaulG

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在有丝分裂中,磷酸化驱动波形蛋白中间丝(IF)细胞骨架的分解。层析分析表明,磷酸化会产生一种可溶的波形蛋白四聚体,但关于磷酸化引起的结构变化或由此产生的四聚体的结构还很少确定。本研究采用定点自旋标记和电子顺磁共振(SDSL-EPR)技术,在体外研究了蛋白激酶A对Vimentin IFS的磷酸化所引起的结构变化。EPR谱表明,磷酸化生成的四聚体物种为A11构型。EPR谱还表明,尽管大多数磷酸化发生在N-末端头部结构域,但结构变化程度最大的是连接体2和杆状结构域的C-末端一半。磷酸化诱导的变化显著地影响了位于连接子2区域的所建议的“触发序列”,该序列被假设为介导了卷曲形成的诱导。这些数据首次记录了生理调节机制导致的IF结构的特定变化,并提供了进一步的证据,也是由SDSL-EPR产生的,即连接区在IF结构和组装/拆卸的调节中发挥关键作用。
Phosphorylation drives the disassembly of the vimentin intermediate filament (IF) cytoskeleton at mitosis. Chromatographic analysis has suggested that phosphorylation produces a soluble vimentin tetramer, but little has been determined about the structural changes that are caused by phosphorylation or the structure of the resulting tetramer. In this study, site-directed spin labeling and electron paramagnetic resonance (SDSL-EPR) were used to examine the structural changes resulting from protein kinase A phosphorylation of vimentin IFs in vitro. EPR spectra suggest that the tetrameric species resulting from phosphorylation is the A11 configuration. EPR spectra also establish that the greatest degree of structural change was found in the linker 2 and the C-terminal half of the rod domain, despite the fact that most phosphorylation occurs in the N-terminal head domain. The phosphorylation-induced changes notably affected the proposed “trigger sequences” located in the linker 2 region, which have been hypothesized to mediate the induction of coiled-coil formation. These data are the first to document specific changes in IF structure resulting from a physiologic regulatory mechanism and provide further evidence, also generated by SDSL-EPR, that the linker regions play a key role in IF structure and regulation of assembly/disassembly.
DOI: 10.1021/bi00433a035
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期刊:
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期刊: European Journal of Biochemistry
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DOI: --
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