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Abscisic acid-dependent multisite phosphorylation regulates the activity of a transcription activator AREB1

Open access
Furihata, Takashi, Maruyama, Kyonoshin, Fujita, Yasunari, Umezawa, Taishi, Yoshida, Riichiro, Shinozaki, Kazuo, Yamaguchi-Shinozaki, Kazuko·2006·Proceedings of the National Academy of Sciences

Abstract

bZIP-type transcription factors AREBs/ABFs bind an abscisic acid (ABA)-responsive cis-acting element named ABRE and transactivate downstream gene expression in Arabidopsis . Because AREB1 overexpression could not induce downstream gene expression, activation of AREB1 requires ABA-dependent posttranscriptional modification. We confirmed that ABA activated 42-kDa kinase activity, which, in turn, phosphorylated Ser/Thr residues of R-X-X-S/T sites in the conserved regions of AREB1. Amino acid substitutions of R-X-X-S/T sites to Ala suppressed transactivation activity, and multiple substitution of these sites resulted in almost complete suppression of transactivation activity in transient assays. In contrast, substitution of the Ser/Thr residues to Asp resulted in high transactivation activity without exogenous ABA application. A phosphorylated, transcriptionally active form was achieved by substitution of Ser/Thr in all conserved R-X-X-S/T sites to Asp. Transgenic plants overexpressing the phosphorylated active form of AREB1 expressed many ABA-inducible genes, such as RD29B , without ABA treatment. These results indicate that the ABA-dependent multisite phosphorylation of AREB1 regulates its own activation in plants.

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Metadata

Authors
Furihata, T., Maruyama, K., Fujita, Y., Umezawa, T., Yoshida, R., Shinozaki, K., & Yamaguchi-Shinozaki, K.
Venue
Proceedings of the National Academy of Sciences
Published
2006-01-30
Volume
103
Issue
6
Pages
1988-1993
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2060396596
Cited by
847
References
36
FWCI
32.14
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Abscisic acid-dependent multisite phosphorylation regulates the activity of a transcription activator AREB1. https://app.cochat.ai/papers/10.1073/pnas.0505667103
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Furihata, T., Maruyama, K., Fujita, Y., Umezawa, T., Yoshida, R., Shinozaki, K., & Yamaguchi-Shinozaki, K. (2006). Abscisic acid-dependent multisite phosphorylation regulates the activity of a transcription activator AREB1. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.0505667103

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