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. 1985 Dec;82(23):7929–7933. doi: 10.1073/pnas.82.23.7929

Identification of a distinct soluble subunit of an intermediate filament protein: tetrameric vimentin from living cells.

P Soellner, R A Quinlan, W W Franke
PMCID: PMC390883  PMID: 3865206

Abstract

Intermediate-sized filaments (IF) are among the most insoluble intracellular protein polymer structures. We have analyzed the small amounts of soluble vimentin, an IF protein, present in cytosol fractions obtained from lysis of cultured cells [rat RVF-SM cells, simian virus 40-transformed human fibroblasts, and human rhabdomyosarcoma (RD line) cells]. The molecular form of this soluble vimentin was determined by sucrose density gradient centrifugation, using vimentin-specific antibodies for subsequent ELISA and immunoblotting analyses. The majority of the soluble vimentin appeared in a distinct form indistinguishable in its sedimentation behavior from reconstituted tetrameric subunits of purified vimentin arrested at low ionic strength. The tetrameric coiled-coil nature of the soluble form of vimentin was indicated by the digestion pattern with chymotrypsin and by chemical crosslinking with copper-1,10-phenanthroline and dimethylsuberimidate. The competence of this soluble vimentin to assemble into IF at higher salt concentrations was demonstrated by electron microscopy. Pulse-chase experiments showed that the soluble form was not an exclusively posttranslational intermediate. We propose that in the living cell a small pool of a distinct soluble tetrameric form of vimentin exists which may exchange with polymeric IF vimentin.

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Selected References

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