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Brassinosteroid mutant (bzr1-1D and det2) analysis

ABSTRACT: Brassinosteroid (BR) homeostasis and signaling are crucial for normal growth and development of plants. BR signaling through cell-surface receptor kinases and intracellular components leads to dephosphorylation and accumulation of the nuclear protein BZR1. How BR signaling regulates gene expression, however, remains unknown. Here we show that BZR1 is a transcriptional repressor that has a previously unknown DNA binding domain and binds directly to the promoters of feedback-regulated BR biosynthetic genes. To identify additional BZR1-regulated genes and to understand the BR-regulated transcriptional pathways, we examined the effects of bzr1-1D and det2 mutations on the expression of BR-regulated genes by using the Arabidopsis full-genome oligo microarray (Affymetrix). Microarray analyses identified additional potential targets of BZR1 and illustrated, together with physiological studies, that BZR1 coordinates BR homeostasis and signaling by playing dual roles in regulating BR biosynthesis and downstream growth responses. Keywords: other

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE2696 | GEO | 2005/05/24

SECONDARY ACCESSION(S): PRJNA92337

REPOSITORIES: GEO

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Transcription profiling of Arabidopsis Brassinosteroid mutant (bzr1-1D and det2) analysis

Project description:Brassinosteroid (BR) homeostasis and signaling are crucial for normal growth; and development of plants. BR signaling through cell-surface receptor; kinases and intracellular components leads to dephosphorylation and; accumulation of the nuclear protein BZR1. How BR signaling regulates gene; expression, however, remains unknown. Here we show that BZR1 is a; transcriptional repressor that has a previously unknown DNA binding domain; and binds directly to the promoters of feedback-regulated BR biosynthetic; genes. To identify additional BZR1-regulated genes and to understand the; BR-regulated transcriptional pathways, we examined the effects of bzr1-1D; and det2 mutations on the expression of BR-regulated genes by using the; Arabidopsis full-genome oligo microarray (Affymetrix). Microarray analyses; identified additional potential targets of BZR1 and illustrated, together; with physiological studies, that BZR1 coordinates BR homeostasis and; signaling by playing dual roles in regulating BR biosynthesis and downstream; growth responses.

2008-06-12 | E-GEOD-2696 | biostudies-arrayexpress

Interaction between BZR1 and PIF4 integrates brassinosteroid and environmental responses [RNA-seq]

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Genome wide BZR1 binding site analysis in Arabidopsis

Project description:BR induces rapid dephosphorylation and nuclear localization of BZR1 through a cascade of signaling events thus regulates BR-responsive gene expression and plant development. We use chromatin-immunoprecipitation microarray (ChIP-chip) experiments identified about 2200 high confidence BZR1 binding sites, which includes all previous known binding regions. The binding sites are distributed throughout the genome but are rare in the centromere regions, which is similar to the distribution of expressed genes. The binding sites were substantially enriched in the 5’ and 3’ intergenic regions compared to the transcribed regions of genes. Combining with transcription profilling of BR regulated genes generated 953 BR regulated BZR1 targets.

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Brassinosteroid, gibberellin, and phytochrome impinge on a common transcription module in Arabidopsis

Project description:Brassinosteroid (BR) and gibberellin (GA) promote many similar developmental responses in plants; but their relationship remains unclear. Here we show that BR and GA act interdependently through a direct interaction between the BR-activated BZR1 and GAinactivated DELLA transcription regulators. GA promotion of cell elongation required BR signaling, whereas BR or active BZR1 can suppresssed the GA-deficient dwarf phenotype. DELLAs directly interacted with BZR1 and inhibited BZR1-DNA binding both in vitro and in vivo. Genome-wide analysis defined a BZR1-dependent GA-regulated transcriptome, which is enriched with light-regulated genes and genes involved in cell wall synthesis and photosynthesis/chloroplast. GA promotion of hypocotyl elongation requires both BZR1 and the phytochrome interacting factors (PIFs), as well as their common downstream targets PREs. The results demonstrate that GA releases DELLA-mediated inhibition of BZR1, and that the DELLA-BZR1-PIF4 interaction defines a core transcription module that mediates coordinated growth regulation by GA, BR and light signals.

2012-06-25 | GSE35408 | GEO

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Expression data from dark-grown BR double mutant bzr1-1D;bri1-116, single mutant bri1-116, and wildtype

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2010-12-31 | GSE25134 | GEO

Antagonistic Regulation of Abscisic Acid Inhibited Root Growth By Brassinosteroid is Partially Mediated by BRASSINAZOLE RESISTENT 1 suppressed ABSCISIC ACID INSENSITIVE 5 expression

Project description:Plant hormone brassinosteroids (BRs) and abscisic acids (ABA) antagonistically regulate many aspects of plant growth and responses. This study analyzes the molecular mechanisms by which regulate the crosstalk between BR and ABA signaling.Various BR deficient and gain-of-function signaling mutants were used to analyze their responses to ABA inhibited primary root growth. RNA sequencing was performed to identify the ABA regulated root genes that are also regulated by BR signaling components.Our result demonstrated that BR signaling negative regulates plant ABA response, and the crosstalk is mediated by BIN2 and BZR1. RNA sequencing has identified subsets of ABA responsive root genes that were regulated by BIN2 and/or BZR1. ChIP-qPCR and EMSA assays showed that BZR1 could bind directly with several G-box cis-elements on ABI5 promoter, suppress the expression of ABI5 and makes plant insensitive to ABA.These data demonstrated that ABI5 is a BZR1 direct targeted gene. Regulation of ABI5 expression by BZR1 plays important roles in regulating the crosstalk between BR and ABA signaling pathways.

2018-11-24 | GSE75377 | GEO

BIC1 acts as a transcriptional coactivator to promote brassinosteroid signaling and plant 14 1 growth

Project description:The BRASSINAZOLE-RESISTANT 1 (BZR1) transcription factor family plays an essential role in plant brassinosteroid (BR) signaling, but the signaling mechanism through which BZR1 and its homologs cooperate with certain coactivators to facilitate transcription of target genes remains incompletely understood. In this study, we used an efficient protein interaction screening system to identify blue-light inhibitor of cryptochromes 1 (BIC1) as a new BZR1-interacting protein in Arabidopsis thaliana. We show that BIC1 positively regulates BR signaling and acts as a transcriptional coactivator for BZR1-dependent activation of BR-responsive genes. Simultaneously, BIC1 interacts with the transcription factor PIF4 to synergistically and interdependently activate expression of downstream genes including PIF4 itself, and to promote plant growth. Chromatin immunoprecipitation assays demonstrate that BIC1 and BZR1/PIF4 interdependently associate with the promoters of common target genes. In addition, we show that the interaction between BIC1 and BZR1 is evolutionally conserved in the model monocot plant Triticum aestivum (bread wheat). Together, our results reveal mechanistic details of BR signaling mediated by a transcriptional activation module BIC1/BZR1/PIF4 and thus provide new insights into the molecular mechanisms underlying the integration of BR and light signaling in plants.

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