Abstract
Microtubules play important roles during growth and morphogenesis of plant cells. Multiple isoforms of α- and β-tubulin accumulate in higher plant cells and originate either by transcription of different genes or by post-translational modifications. The use of different tubulin isoforms involves the binding of microtubules to different associated proteins and therefore generates microtubules with different organizations and functions. Tubulin isoforms are differentially expressed in vegetative and reproductive structures according to the developmental program of plants. In grapevine (Vitis vinifera L.), vegetative and reproductive structures appear on the same stem, making this plant species an excellent model to study the accumulation of tubulin isoforms. Proteins were extracted from grapevine samples (buds, leaves, flowers and tendrils) using an optimized extraction protocol, separated by two-dimensional electrophoresis and analyzed by immunoblot with anti-tubulin antibodies. We identified eight α-tubulin and seven β-tubulin isoforms with pI around 4.8–5 that group into separate clusters. More acidic α-tubulin isoforms were detected in buds, while more basic α-isoforms were prevalently found in tendrils and flowers. Similarly, more acidic β-tubulin isoforms were used in the bud stage while a basic β-tubulin isoform was essentially used in leaves and two central β-tubulin isoforms were characteristically used in tendrils and flowers. Acetylated α-tubulin was not detected in any sample while tyrosinated α-tubulin was essentially found in large latent buds and in bursting buds in association with a distinct subset of tubulin isoforms. The implication of these data on the use of different tubulin isoforms during grapevine development is discussed.
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Notes
This antibody is different from the aN-18 listed in the α-tubulin section. The two antibodies have the same name but different code numbers and cross-react with different proteins.
Abbreviations
- DTT:
-
Dithiothreitol
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Acknowledgments
We sincerely thank Prof. Mario Pezzotti (Dipartimento di Scienze, Tecnologie e Mercati della Vite e del Vino, University of Verona, Italy), Prof. Enrico Pè (Scuola Superiore Sant’Anna, Pisa, Italy) and Prof. Luca Bini (Dipartimento di Biologia Molecolare, University of Siena, Italy) for helpful suggestions and criticisms. This work was funded in the framework of the Vigna Project (http://www.vitisgenome.it/en/index.php5).
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Parrotta, L., Cai, G. & Cresti, M. Changes in the accumulation of α- and β-tubulin during bud development in Vitis vinifera L.. Planta 231, 277–291 (2010). https://doi.org/10.1007/s00425-009-1053-9
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DOI: https://doi.org/10.1007/s00425-009-1053-9