Summary
Ciliates are highly differentiated cells which display extensive deployment of microtubular systems. Because genetic diversity of tubulin is extremely reduced in these cells, microtubule diversity is mostly generated at the post-translational level either through direct modification of tubulin or through the binding of associated proteins to microtubules. We have undertaken a systematic exploration of microtubule diversity in ciliates by way of production of monoclonal antibodies. Previously we reported the biochemical characterization of these antibodies. In addition to antibodies directed against primary sequences, we obtained antibodies directed against post-translational modifications. In this paper, we report a detailed analysis of the distribution of the various epitopes on the microtubular networks ofParamecium, both in interphase cells and during division morphogenesis. Each of these antibodies decorates a subset of microtubules. Acetylation, recognized by antibodies TEU 318 and TEU 348, is detected on stable microtubules early after microtubule assembly. Epitopes recognized by two other antibodies (TAP 952 and AXO 58) are found on a subset of stable microtubules; in addition, the TAP 952 antibody is also found on labile microtubules; both epitopes are detected as soon as microtubule assembly occurs. In contrast, the epitope of the antibody, AXO 49, is associated with only a restricted subset of stable microtubules in the interphase cell, and is detected a lag-time after microtubule assembly during division morphogenesis. These data show that microtubule diversity is generated through a time-dependent sequence and according to a definite spatial pattern.
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Fleury, A., Callen, A.M., Bré, M.H. et al. Where and when is microtubule diversity generated inParamecium? Immunological properties of microtubular networks in the interphase and dividing cells. Protoplasma 189, 37–60 (1995). https://doi.org/10.1007/BF01280290
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DOI: https://doi.org/10.1007/BF01280290