Proteomic analysis of xylem vessel cell differentiation in VND7-inducible tobacco BY-2 cells by two-dimensional gel electrophoresis

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  • Noguchi Masahiro
    Graduate School of Biological Sciences, Nara Institute of Science and Technology
  • Fujiwara Masayuki
    Graduate School of Biological Sciences, Nara Institute of Science and Technology
  • Sano Ryosuke
    Graduate School of Biological Sciences, Nara Institute of Science and Technology
  • Nakano Yoshimi
    Graduate School of Biological Sciences, Nara Institute of Science and Technology
  • Fukao Yoichiro
    College of Life Sciences, Department of Bioinformatics, Ritsumeikan University
  • Ohtani Misato
    Graduate School of Biological Sciences, Nara Institute of Science and Technology RIKEN Center for Sustainable Resource Science
  • Demura Taku
    Graduate School of Biological Sciences, Nara Institute of Science and Technology RIKEN Center for Sustainable Resource Science

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<p>The xylem vessel is an essential structure for water conduction in vascular plants. Xylem vessel cells deposit thick secondary cell walls and undergo programmed cell death, to function as water-conducting elements. Since the discovery of the plant-specific NAC domain-type VASCULAR-RELATED NAC-DOMAIN (VND) transcription factors, which function as master switches of xylem vessel cell differentiation in Arabidopsis, much has been learned about the transcriptional regulatory network of xylem vessel cell differentiation. However, little is known about proteome dynamics during xylem vessel cell differentiation. Here, we performed two-dimensional electrophoresis-based proteomic analysis of xylem vessel cell differentiation using a transgenic tobacco BY-2 cell line carrying the VND7-inducible system (BY-2/35S::VND7-VP16-GR), in which synchronous trans-differentiation into xylem vessel cells can be induced by the application of a glucocorticoid. Of the 47 spots revealed by gel electrophoresis, we successfully identified 40 proteins. Seventeen proteins, including several well-characterized proteins such as a cysteine protease and serine carboxypeptidase (involved in programmed cell death), were upregulated after 24 h of induction. However, previous transcriptomic analysis showed that only eight of these proteins are upregulated at the transcriptional level during xylem vessel cell differentiation in BY-2/35S::VND7-VP16-GR cells. These findings suggest that post-transcriptional regulation strongly affects proteomic dynamics during xylem vessel cell differentiation.</p>

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