Abstract
High-resolution analysis of tubulin structure and docking the structure of tubulin dimer into a map of microtubules led to a prediction that sites for tubulin acetylation are in the interior of microtubules. This is somehow difficult to reconcile with their susceptibility to proteases and acetylation in assembled microtubules. To assess the availability of acetylated alpha-tubulin for antibodies, immunofluorescence on detergent-extracted cells, on cells fixed under various conditions and in microinjected cells was performed with monoclonal antibodies of known epitope locations. The presented data indicate that acetylated alpha:Lys40 is not exposed on unfixed microtubules but that this region of lumenal microtubule surface becomes easily exposed under mild fixation conditions.
Published Version
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