Regulates seed dormancy and flowering time through an influence on levels of microRNAs miR156 and miR172 (PubMed:27035986). Regulator of seed maturation interfering with abscisic acid signaling components and activating ABI5 (PubMed:26729600). In cv. Cvi-1, enhances glucose induction of ABI4 (PubMed:18410483).

Acts as a negative regulator of abscisic acid (ABA) response during germination through the ubiquitin-mediated proteolysis of ABI5/DPBF1.

Finally, the Glc-mediated regulation of ABI4 and ABI5 is affected in mutants displaying Glc-insensitive phenotypes such as gins, abas, abi4, abi5, and ctr1 but not in abi1-1, abi2-1, and abi3-1, which do not show a Glc-insensitive UniProt: A0MES8: Matches: In the ABA-ABAR-WRKY40-ABI5 core signaling complex, WRKY40 acts to suppress ABA signaling, and high levels of ABA promote ABAR-WRKY40 interactions, then activate expression of ABA responsive genes, including the ABA responsive transcription factors ABI5 and ABI4. Expression analysis using abi3 and abi5 mutants showed that ABI3 and ABI5 play important roles in the expression of RD29B in seeds. Base-substitution analysis showed that two ABREs function strongly and one ABRE coupled with DRE functions weakly in the expression of RD29A in embryos. Encodes a member of the basic leucine zipper transcription factor family, involved in ABA signalling during seed maturation and germination. The Arabidopsis abscisic acid (ABA)-insensitive abi5 mutants have pleiotropic defects in ABA response, including decreased sensitivity to ABA inhibition of germination and altered expression of some ABA-regulated genes. ABI5 participates in ABA-regulated gene expression during seed development and subsequent vegetative stage by acting as the major mediator of ABA repression of growth.

Both TAP46 and PP2A interact with the ABA-regulated transcription factor ABA INSENSITIVE5 (ABI5) in vivo, and TAP46's binding to ABI5 can stabilize ABI5. Furthermore, TAP46's binding to the phosphorylated ABI5 may prevent PP2A or PP2A-like protein phosphatases from removing the phosphate from ABI5, thereby maintaining ABI5 in its active form. name polymorphisms background stock name; CS8105 : abi5-1 : CS8105: images : phenotypes ; Finkelstein, R. R.,Lynch, T. J.(2000) abscisic acid resistant, reduced sensitivity to ABA inhibition of germination, germinates in the presence of 3 microM ABA; does not exhibit compromised water relations, normal stomatal regulation, not wilty phenotype; seed dormancy similar to wt; reduced sensitivity May play a role in signal transduction of hyperosmotic response (Probable). Can phosphorylate BZIP46 in vitro (PubMed:22301130). Together with ABI5, PP2C30 and PYL5, is part of an abscisic acid (ABA) signaling unit that modulates seed germination and early seedling growth (PubMed:22071266). ABI4 and ABI5 response to the Glc analog 2-deoxy-Glc supports this conclusion.

It was previously shown in imbibed seeds under white light that MFT expression is promoted by ABA and repressed by GA in an ABI5- and DELLA dependent manner, respectively.

Background ABI5 (abscisic acid insensitive 5) is involved in ABA-regulated gene expression during seed development and subsequent vegetative stage and acts as the major mediator of ABA repression of growth. Binds to the embryo specification element and the ABA-responsive element (ABRE) of the Dc3 gene promoter and to the ABRE of the Em1 and Em6 genes promoters.

seeds at concentrations below those known to inhibit early seedling development. Encodes a member of the basic leucine zipper transcription factor family, involved in ABA signalling during seed maturation and germination.

abi5_arath
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In cv. Cvi-1, enhances glucose induction of ABI4 (PubMed:18410483).

Participates in ABA-regulated gene expression during seed development and subsequent vegetative stage by acting as the major mediator of ABA repression of growth. Binds to the embryo specification element and the ABA-responsive element (ABRE) of the Dc3 gene promoter and to the ABRE of the Em1 and Em6 genes promoters. Can also trans-activate its own promoter, suggesting that it is autoregulated. Transcription factor that possesses transactivation activity in yeast (PubMed:17604002, PubMed:21055780, PubMed:18236009).
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May play a role in signal transduction of hyperosmotic response (Probable). Can phosphorylate BZIP46 in vitro (PubMed:22301130). Together with ABI5, PP2C30 and PYL5, is part of an abscisic acid (ABA) signaling unit that modulates seed germination and early seedling growth (PubMed:22071266). Encodes a member of the basic leucine zipper transcription factor family, involved in ABA signalling during seed maturation and germination.
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Alternative names: ABI5, ABA INSENSITIVE 5, GIA1, GROWTH-INSENSITIVITY TO ABA 1, Dc3 promoter-binding factor 1, AtDPBF1, GROWTH-INSENSITIVITY TO ABA 1, bZIP transcription factor 39, AtbZIP39. Molecular Weight 47 kDa UniProt Q9SJN0

The Arabidopsis CROWDED NUCLEI genes regulate seed germination by modulating degradation of ABI5 protein. Zhao W., Guan C., Feng J., Liang Y., Zhan N., Zuo J., Ren B. In Arabidopsis, the phytohormone abscisic acid (ABA) plays a vital role in inhibiting seed germination and in post-germination seedling establishment. Regulation of Arabidopsis thaliana Em genes: role of ABI5. Carles C., Bies-Etheve N., Aspart L., Leon-Kloosterziel K.M., Koornneef M., Echeverria M., Delseny M. In order to identify new factors involved in Em (a class I Late Embryogenesis Abundant protein) gene expression, Arabidopsis mutants with an altered expression of an Em promoter GUS fusion construct and a modified accumulation of Em AFP is a novel negative regulator of ABA signaling that promotes ABI5 protein degradation.

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Physical interactions between ABA response loci of Arabidopsis. Nakamura S., Lynch T.J., Finkelstein R.R. Genetic and physiological studies have shown that the Arabidopsis thaliana abscisic acid-insensitive (ABI) loci interact to regulate seed-specific and/or ABA-inducible gene expression.

abi5_arath This subsection of the 'Entry information' section provides one or more accession number(s). These are stable identifiers and should be used to cite UniProtKB entries.

Alternative names: ABI5, ABA INSENSITIVE 5, GIA1, GROWTH-INSENSITIVITY TO ABA 1, Dc3 promoter-binding factor 1, AtDPBF1, GROWTH-INSENSITIVITY TO ABA 1, bZIP transcription factor 39, AtbZIP39. Molecular Weight 47 kDa UniProt Q9SJN0

Physical interactions between ABA response loci of Arabidopsis. Nakamura S., Lynch T.J., Finkelstein R.R. Genetic and physiological studies have shown that the Arabidopsis thaliana abscisic acid-insensitive (ABI) loci interact to regulate seed-specific and/or ABA-inducible gene expression.

abi5_arath
This subsection of the 'Entry information' section provides one or more accession number(s). These are stable identifiers and should be used to cite UniProtKB entries.