Summary
The localization of HSP90 (heat-shock protein 90) was analyzed with respect to the microtubular cytoskeleton by double immunofluorescence and confocal laser microscopy in tobacco VBI-O cells during axial cell division and elongation. HSP90 was observed to be colocalized with cortical and radial microtubules and the nuclear envelope in premitotic cells, with the preprophase band, and with the phragmoplast. The HSP90 epitope could not be detected in mature division spindles. The association of the HSP90 epitope with radial and cortical microtubules was not continuous in space. HSP90 was organized in discrete foci that were found to be aligned with microtubules, and the distance between these foci increased, when the cells entered the elongation phase. Elimination of microtubules by drugs resulted in a loss of cell axiality and alignment of the HSP90 epitope. Together with biochemical data demonstrating binding of tobacco HSP90 to tubulin dimers these data indicate a possible role of HSP90 in the organization of microtubules.
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Abbreviations
- EPC:
-
ethyl-N-phenylcarbamate
- FITC:
-
fluorescein isothiocyanate
- HSP90:
-
heat-shock protein 90
- MAP:
-
microtubuleassociated protein
- TRITC:
-
tetramethylrhodamine B isothiocyanate
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Petrášek, J., Freudenreich, A., Heuing, A. et al. Heat-shock protein 90 is associated with microtubules in tobacco cells. Protoplasma 202, 161–174 (1998). https://doi.org/10.1007/BF01282544
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DOI: https://doi.org/10.1007/BF01282544