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Simultaneous labelling of microtubules and fibrillar bundles in tobacco BY-2 cells by the anti-intermediate filament antibody, ME 101

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Summary

In previous studies on plant cells, antibodies directed against intermediate filaments (IFs) have shown that IF antigens are distributed in one of two quite distinct forms. The first co-distributes with each of the four microtubule arrays (cortical, preprophase band, spindle and phragmoplast), while the second form is associated with cytoplasmic paracrystalline fibrillar bundles (FBs) of 10 nm filaments. Conditions allowing one form to be labelled with antibody have generally proved unsuitable for labelling of the other; this has prevented the simultaneous visualization of the two forms of IF antigen in plants and the study of any possible physical relationships between them at the electron microscopic level. In this paper, we show that ME 101, which recognizes an epitope in the N-terminal portion of all classes of intermediate filaments, stains both forms of plant IF antigen simultaneously in tobacco suspension cells using immunofluorescence or immunogold labelling techniques. These cells contain in their cortex short (ca. l μm) fibrillar bundles which stain with ME 101. These bundles appear to be independent of the microtubule-associated epitope which stains in a continuous linear manner with ME 101. When protoplasts are either cleaved open on grids or sequentially extracted with detergents prior to critical point drying, the short fibrillar bundles are specifically labelled by ME 101 tagged with colloidal gold. ME 101 also co-distributed with underlying linear filaments, which appeared to be microtubules. In addition to these structures, the cortex also contains a meshwork of variably-sized fine filaments but these are not labelled with ME 101 nor with an antibody raised against the plant cytoskeleton, which recognizes cytokeratin 8. These results confirm that the fibrillar bundles and the microtubule-associated form of plant IF antigens are present simultaneously rather than experimentally-interconvertible, and that they appear to be physically unconnected.

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Abbreviations

DAPI:

4′,6-diamidino-2-phenylindole

FB:

fibrillar bundle

FITC:

fluorescein isothiocyanate

IF:

intermediate filaments

MTSB:

microtubule stabilizing buffer

TBS:

Tris-buffered-saline

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Authors and Affiliations

  1. Brassica and Oilseeds Research Department, John Innes Centre, NR4 7UH, Norwich, UK

    D. J. Fairbairn

  2. Department of Cell Biology, John Innes Centre, Norwich

    K. C. Goodbody & C. W. Lloyd

Authors
  1. D. J. Fairbairn
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  2. K. C. Goodbody
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  3. C. W. Lloyd
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Fairbairn, D.J., Goodbody, K.C. & Lloyd, C.W. Simultaneous labelling of microtubules and fibrillar bundles in tobacco BY-2 cells by the anti-intermediate filament antibody, ME 101. Protoplasma 182, 160–169 (1994). https://doi.org/10.1007/BF01403476

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  • DOI: https://doi.org/10.1007/BF01403476

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