NDLI: Identification of phosphorylation-induced changes in vimentin Intermediate Filaments by SDSL-EPR†

Content Provider	PubMed Central
Author	Pittenger, Josh T. Hess, John F. Budamagunta, Madhu S. Voss, John C. Fitzgerald, Paul G.
Abstract	Phosphorylation drives the disassembly of the vimentin Intermediate Filament (IF1) 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.
Related Links	http://dx.doi.org/10.1021/bi801137m
Ending Page	10870
Page Count	8
Starting Page	10863
File Format	PDF
ISSN	00062960
e-ISSN	15204995
Journal	Biochemistry
Issue Number	41
Volume Number	47
Language	English
Publisher Date	2008-10-14
Access Restriction	Open
Subject Keyword	Biochemistry Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Biochemistry

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