Regulated Changes in the Acetylation of α-Tubulin on Lys<sup>40</sup> during Growth and Organ Development in Fast Plants, <i>Brassica rapa</i> L.

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  • NAKAGAWA Umihito
    Department of Bioscience, Nagahama Institute of Bio-Science and Technology
  • KAMEMURA Kazuo
    Department of Bioscience, Nagahama Institute of Bio-Science and Technology
  • IMAMURA Aya
    Department of Bioscience, Nagahama Institute of Bio-Science and Technology

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  • Regulated Changes in the Acetylation of α-Tubulin on Lys⁴⁰ during Growth and Organ Development in Fast Plants, Brassica rapa L

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Abstract

Recently, we confirmed the widespread occurrence of α-tubulin acetylation on Lys40 in angiosperms. In the present study, we found that α-tubulin acetylation is regulated in a growth stage- and organ development-dependent manner in the rapid cycling Brassica rapa, also known as Fast Plants. Organ distribution analysis showed that the proportion of acetylated α-tubulin is high in the cotyledons of young plants and in the true leaves and flowers of mature plants. A correlation between the increase in the levels of α-tubulin acetylation and the maturation of true leaves was observed. In the mature leaves, the acetylated α-tubulin showed an uneven distribution pattern, and the cells in the region of the leaf margins contained a high proportion of acetylated α-tubulin. These results indicate that α-tubulin acetylation is dynamically regulated in plant organs during development, and that it might play an important role in microtubule functioning throughout the angiosperm's life cycle.

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