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Journal ArticleDOI

The Jasmonate-ZIM-Domain Proteins Interact with the WD-Repeat/bHLH/MYB Complexes to Regulate Jasmonate-Mediated Anthocyanin Accumulation and Trichome Initiation in Arabidopsis thaliana

01 May 2011-The Plant Cell (American Society of Plant Biologists)-Vol. 23, Iss: 5, pp 1795-1814
TL;DR: It is speculated that the JA-induced degradation of Jaz proteins abolishes the interactions of JAZ proteins with bHLH and MYB factors, allowing the transcriptional function of WD-repeat/bHLH/MYB complexes, which subsequently activate respective downstream signal cascades to modulate anthocyanin accumulation and trichome initiation.
Abstract: Jasmonates (JAs) mediate plant responses to insect attack, wounding, pathogen infection, stress, and UV damage and regulate plant fertility, anthocyanin accumulation, trichome formation, and many other plant developmental processes. Arabidopsis thaliana Jasmonate ZIM-domain (JAZ) proteins, substrates of the CORONATINE INSENSITIVE1 (COI1)–based SCF COI1 complex, negatively regulate these plant responses. Little is known about the molecular mechanism for JA regulation of anthocyanin accumulation and trichome initiation. In this study, we revealed that JAZ proteins interact with bHLH (Transparent Testa8, Glabra3 [GL3], and Enhancer of Glabra3 [EGL3]) and R2R3 MYB transcription factors (MYB75 and Glabra1), essential components of WD-repeat/bHLH/MYB transcriptional complexes, to repress JA-regulated anthocyanin accumulation and trichome initiation. Genetic and physiological evidence showed that JA regulates WD-repeat/bHLH/MYB complex-mediated anthocyanin accumulation and trichome initiation in a COI1 -dependent manner. Overexpression of the MYB transcription factor MYB75 and bHLH factors ( GL3 and EGL3 ) restored anthocyanin accumulation and trichome initiation in the coi1 mutant, respectively. We speculate that the JA-induced degradation of JAZ proteins abolishes the interactions of JAZ proteins with bHLH and MYB factors, allowing the transcriptional function of WD-repeat/bHLH/MYB complexes, which subsequently activate respective downstream signal cascades to modulate anthocyanin accumulation and trichome initiation.

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Citations
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Journal ArticleDOI
TL;DR: Important new components of jasmonate signalling including its receptor were identified, providing deeper insight into the role ofJASMONATE signalling pathways in stress responses and development.

1,868 citations


Cites background from "The Jasmonate-ZIM-Domain Proteins I..."

  • ...Most recently, however, transcriptional repression by fulllength JAZ8 has been described (Shyu et al., 2012), which is based on increased stability of JAZ8 due to lack of the conserved LPIARR motif....

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  • ...The JID domain occurring in MYC2, MYC3 and MYC4 is also present in other bHLH TFs, like GL3, EGL3 and TT8, which are known to be involved in anthocyanin formation and trichome initiation, and they have been shown to interact with JAZ1 and JAZ8 (Qi et al., 2011)....

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  • ...Later, both of them were identified as targets of JAZ1 and JAZ8 by yeast two-hybrid screening (Song et al., 2011), showing that the interactions of both JAZs with MYB21 and MYB24 occur via the N-terminal R2R3 domain (Song et al., 2011)....

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  • ...In the pft1/med25 mutant, pathogen-responsive JAZ9 expression is diminished (Kidd et al., 2009), while the JA-induced expression of JAZ6 and JAZ8 is significantly reduced in the med25 mutant lines (Chen et al., 2012)....

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  • ...The WD40/bHLH (GL3, EGL3 and TT8)/MYB (PAP1 and GL1) complex is a regulatory module for anthocyanin and trichome initiation (Qi et al., 2011) (see sections 5.5 and 9.7)....

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Journal ArticleDOI
TL;DR: Recent advances in the characterization of the underlying regulatory mechanisms of flavonoid biosynthesis are reviewed, with a special focus on the MBW (MYB-bHLH-WDR) protein complexes.

1,032 citations

Journal ArticleDOI
TL;DR: In the rhizosphere, increasing evidence suggests that root specific chemicals (exudates) might initiate and manipulate biological and physical interactions between roots and soil organisms, and one-way signals that relate the nature of chemical and physical soil properties to the roots.

855 citations


Cites background from "The Jasmonate-ZIM-Domain Proteins I..."

  • ...thaliana by binding to the bHLH and R2R3MYB factors, with jasmonic acid promoting the ubiquitin-mediated degradation of the JAZ proteins [113]....

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Journal ArticleDOI
TL;DR: A simplified model for the different regulatory networks involved with anthocyanin production in fruit is proposed and shows clear links between the developmental regulatory network and the specific regulators of anthcyanin biosynthesis during fruit ripening.

789 citations

Journal ArticleDOI
TL;DR: Mechanistic new insights are revealed into the mode of action of this versatile TF that is involved in JA-regulated plant development, lateral and adventitious root formation, flowering time, and shade avoidance syndrome.

698 citations

References
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Journal ArticleDOI
TL;DR: The modified method should facilitate high-throughput transformation of Arabidopsis for efforts such as T-DNA gene tagging, positional cloning, or attempts at targeted gene replacement.
Abstract: Summary The Agrobacterium vacuum infiltration method has made it possible to transform Arabidopsis thaliana without plant tissue culture or regeneration. In the present study, this method was evaluated and a substantially modified transformation method was developed. The labor-intensive vacuum infiltration process was eliminated in favor of simple dipping of developing floral tissues into a solution containing Agrobacterium tumefaciens, 5% sucrose and 500 microliters per litre of surfactant Silwet L-77. Sucrose and surfactant were critical to the success of the floral dip method. Plants inoculated when numerous immature floral buds and few siliques were present produced transformed progeny at the highest rate. Plant tissue culture media, the hormone benzylamino purine and pH adjustment were unnecessary, and Agrobacterium could be applied to plants at a range of cell densities. Repeated application of Agrobacterium improved transformation rates and overall yield of transformants approximately twofold. Covering plants for 1 day to retain humidity after inoculation also raised transformation rates twofold. Multiple ecotypes were transformable by this method. The modified method should facilitate high-throughput transformation of Arabidopsis for efforts such as T-DNA

18,757 citations


"The Jasmonate-ZIM-Domain Proteins I..." refers methods in this paper

  • ...These constructs were introduced into the COI1/coi1-2 heterozygous plants using the Agrobacterium-mediated flower dip method (Clough and Bent, 1998)....

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Journal ArticleDOI
TL;DR: Some of the recent advances in flavonoid research are reviewed and the role of anthocyanins and flavones in providing stable blue flower colours in the angiosperms is outlined.

3,465 citations


"The Jasmonate-ZIM-Domain Proteins I..." refers background in this paper

  • ..., 2009), and by various environmental stresses, including UV irradiation, pathogen infection, insect attack, drought, wounding, and nutrient depletion (Harborne and Williams, 2000; Cominelli et al., 2008; Gonzalez et al., 2008; Lillo et al., 2008; Gonzalez, 2009)....

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  • ...…insects to pollinate flowers (Vogt et al., 1994), participate in pollen–pistil interactions (Mo et al., 1992), protect plants from UV radiation (Harborne and Williams, 2000; Solovchenko and Schmitz-Eiberger, 2003) and stress damage (Winkel-Shirley, 2002), and function as antimicrobial agents…...

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  • ...…1992), protect plants from UV radiation (Harborne and Williams, 2000; Solovchenko and Schmitz-Eiberger, 2003) and stress damage (Winkel-Shirley, 2002), and function as antimicrobial agents against insect attack and pathogen infection (Harborne and Williams, 2000; Winkel-Shirley, 2001; Gould, 2004)....

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  • ..., 1992), protect plants from UV radiation (Harborne and Williams, 2000; Solovchenko and Schmitz-Eiberger, 2003) and stress damage (Winkel-Shirley, 2002), and function as antimicrobial agents against insect attack and pathogen infection (Harborne and Williams, 2000; Winkel-Shirley, 2001; Gould, 2004)....

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  • ...…Loreti et al., 2008; Shan et al., 2009), and by various environmental stresses, including UV irradiation, pathogen infection, insect attack, drought, wounding, and nutrient depletion (Harborne and Williams, 2000; Cominelli et al., 2008; Gonzalez et al., 2008; Lillo et al., 2008; Gonzalez, 2009)....

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Journal ArticleDOI
TL;DR: The role of flavonoids as the major red, blue, and purple pigments in plants has gained these secondary products a great deal of attention over the years.
Abstract: The role of flavonoids as the major red, blue, and purple pigments in plants has gained these secondary products a great deal of attention over the years. From the first description of acid and base effects on plant pigments by Robert Boyle in 1664 to the characterization of structural and

2,916 citations


"The Jasmonate-ZIM-Domain Proteins I..." refers background in this paper

  • ...…1992), protect plants from UV radiation (Harborne and Williams, 2000; Solovchenko and Schmitz-Eiberger, 2003) and stress damage (Winkel-Shirley, 2002), and function as antimicrobial agents against insect attack and pathogen infection (Harborne and Williams, 2000; Winkel-Shirley, 2001; Gould, 2004)....

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Journal ArticleDOI
09 Aug 2007-Nature
TL;DR: The results suggest a model in which jasmonate ligands promote the binding of the SCFCOI1 ubiquitin ligase to and subsequent degradation of the JAZ1 repressor protein, and implicate theSCFCOi1–JAZ1 protein complex as a site of perception of the plant hormone JA–Ile.
Abstract: Jasmonate and related signalling compounds have a crucial role in both host immunity and development in plants, but the molecular details of the signalling mechanism are poorly understood. Here we identify members of the jasmonate ZIM-domain (JAZ) protein family as key regulators of jasmonate signalling. JAZ1 protein acts to repress transcription of jasmonate-responsive genes. Jasmonate treatment causes JAZ1 degradation and this degradation is dependent on activities of the SCF(COI1) ubiquitin ligase and the 26S proteasome. Furthermore, the jasmonoyl-isoleucine (JA-Ile) conjugate, but not other jasmonate-derivatives such as jasmonate, 12-oxo-phytodienoic acid, or methyl-jasmonate, promotes physical interaction between COI1 and JAZ1 proteins in the absence of other plant proteins. Our results suggest a model in which jasmonate ligands promote the binding of the SCF(COI1) ubiquitin ligase to and subsequent degradation of the JAZ1 repressor protein, and implicate the SCF(COI1)-JAZ1 protein complex as a site of perception of the plant hormone JA-Ile.

2,061 citations


"The Jasmonate-ZIM-Domain Proteins I..." refers background or methods in this paper

  • ...…of the SCFCOI1 complex, contain 12 members and function as negative regulators to repress diverse JA responses, probably by directly inhibiting various transcriptional regulators (Chini et al., 2007; Thines et al., 2007; Yan et al., 2007; Fonseca et al., 2009a; Seo et al., 2011; Song et al., 2011)....

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  • ..., 2002), and JAZ1D3A (Thines et al., 2007) mutants were described as previously....

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  • ...Upon perception of a JA signal, COI1 recruits JAZ proteins for ubiquitination and subsequent degradation through the 26S proteasome to activate downstream signal cascades that modulate JA-mediated plant responses (Chini et al., 2007; Thines et al., 2007; Fonseca et al., 2009b; Yan et al., 2009; Sheard et al., 2010)....

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  • ...JAZ8NT contained a ZIM domain, whereas JAZ11NT harbored two ZIM domains and one Jas domain (Figures 5A and 5B) (Chini et al., 2007; Thines et al., 2007; Katsir et al., 2008a)....

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  • ...The JA-ZIMdomain (JAZ) proteins, substrates of the SCFCOI1 complex, contain 12 members and function as negative regulators to repress diverse JA responses, probably by directly inhibiting various transcriptional regulators (Chini et al., 2007; Thines et al., 2007; Yan et al., 2007; Fonseca et al., 2009a; Seo et al., 2011; Song et al., 2011)....

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Journal ArticleDOI
09 Aug 2007-Nature
TL;DR: The identification of JASMONATE-INSENSITIVE 3 (JAI3) and a family of related proteins named JAZ (jasmonate ZIM-domain), in Arabidopsis thaliana and the existence of a regulatory feed-back loop involving MYC2 and JAZ proteins, which provides a mechanistic explanation for the pulsed response to jasmonate and the subsequent desensitization of the cell.
Abstract: Jasmonates are essential phytohormones for plant development and survival. However, the molecular details of their signalling pathway remain largely unknown. The identification more than a decade ago of COI1 as an F-box protein suggested the existence of a repressor of jasmonate responses that is targeted by the SCF(COI1) complex for proteasome degradation in response to jasmonate. Here we report the identification of JASMONATE-INSENSITIVE 3 (JAI3) and a family of related proteins named JAZ (jasmonate ZIM-domain), in Arabidopsis thaliana. Our results demonstrate that JAI3 and other JAZs are direct targets of the SCF(COI1) E3 ubiquitin ligase and jasmonate treatment induces their proteasome degradation. Moreover, JAI3 negatively regulates the key transcriptional activator of jasmonate responses, MYC2. The JAZ family therefore represents the molecular link between the two previously known steps in the jasmonate pathway. Furthermore, we demonstrate the existence of a regulatory feed-back loop involving MYC2 and JAZ proteins, which provides a mechanistic explanation for the pulsed response to jasmonate and the subsequent desensitization of the cell.

1,991 citations


"The Jasmonate-ZIM-Domain Proteins I..." refers background or result in this paper

  • ...…of the SCFCOI1 complex, contain 12 members and function as negative regulators to repress diverse JA responses, probably by directly inhibiting various transcriptional regulators (Chini et al., 2007; Thines et al., 2007; Yan et al., 2007; Fonseca et al., 2009a; Seo et al., 2011; Song et al., 2011)....

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  • ...JAZ8NT contained a ZIM domain, whereas JAZ11NT harbored two ZIM domains and one Jas domain (Figures 5A and 5B) (Chini et al., 2007; Thines et al., 2007; Katsir et al., 2008a)....

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  • ...Previous studies showed that MYC2 (Boter et al., 2004; Lorenzo et al., 2004; Dombrecht et al., 2007), a target gene of JAZ proteins (Chini et al., 2007), is rapidly induced upon JA treatment (Chung et al., 2008; Pauwels et al., 2008)....

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  • ...The JA-ZIMdomain (JAZ) proteins, substrates of the SCFCOI1 complex, contain 12 members and function as negative regulators to repress diverse JA responses, probably by directly inhibiting various transcriptional regulators (Chini et al., 2007; Thines et al., 2007; Yan et al., 2007; Fonseca et al., 2009a; Seo et al., 2011; Song et al., 2011)....

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  • ...…by diverse developmental and environmental signals, the JA signal induces degradation of JAZ proteins through the SCFCOI1-26S proteasome pathway (Chini et al., 2007; Thines et al., 2007; Chung et al., 2009); the WD-repeat/bHLH/MYB complexes are then released to activate their respective…...

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