The Common Function of a Novel Subfamily of B-Box Zinc Finger Proteins with Reference to Circadian-Associated Events in Arabidopsis thaliana

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概要

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• Over 1,600 genes encoding putative transcription factors have been identified in the Arabidopsis genome sequence, however, their physiological functions are not yet fully understood. In this study, a small subfamily of double B-box zinc finger (DBB, DOUBLE B-BOX) genes, encoding eight putative transcription factors, were characterized with reference to the circadian rhythm and the early photomorphogenic regulation of hypocotyl elongation in response to light signals. Among these, it was found that the transcriptions of five DBB genes were under the control of circadian rhythm. To gain insight into the physiological roles of these putative transcription factors, forward and reverse genetic studies were carried out. The results suggested that they are commonly implicated in light signal transduction during early photomorphogenesis, however, their functions are not totally redundant, as judged by the fact that their circadian-expression profiles (or phases) were distinctive from each other, and by the fact that some DBBs (named DBB1a, DBB1b, STO, and STH) were apparently implicated in light signal transduction in a negative manner, whereas another (named DBB3) was implicated in a positive manner with regard to light-induced inhibition of elongation of hypocotyls. We also found that homologous B-box zinc finger genes are widely conserved in higher plants (e.g., Oryza sativa). Taking this altogether, it is probable that in addition to previously characterized bZIP-type transcription factors (e.g., HY5 and HYH) and bHLH-type transcription factors (e.g., PIF4 and PIF5/PIL6), a set of B-box zinc finger transcription factors should also be taken into consideration for a better understanding of the complex molecular mechanisms underlying the early photomorphogenic development of Arabidopsis thaliana.

• 社団法人 日本農芸化学会の論文

著者

• Kato Takahiko

  Kazusa Dna Research Institute

• Kumagai Takeshi

  Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University

• Ito Shogo

  Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University

• Nakamichi Norihito

  Division of Biological Science, Graduate School of Science, Nagoya University

• NIWA Yusuke

  Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University

• MURAKAMI Masaya

  Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University

• YAMASHINO Takafumi

  Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University

• MIZUNO Takeshi

  Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University

• Nakamichi Norihito

  Riken Yokohama Jpn

• Ito Shogo

  Nagoya Univ. Nagoya Jpn

• Kato Tomohiko

  Mitsui Plant Biotech. Res. Inst.

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