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The Arabidopsis GAGA-binding factor BPC6 recruits PRC1 component LHP1 to GAGA DNA-motifs

ABSTRACT: Plant BBR/BPC transcription factors contain the conserved Basic-Pentacystein (BPC) DNA-binding domain. Arabidopsis group II BBR/BPC proteins interact with PRC1 component LHP1 in vivo. Microarray experiments with Arabidopsis bpc4 bpc6, lhp1-4 and lhp1-4 bpc4 bpc6 suggest an importance of this interaction in the concerted repression of homeotic genes. In this study, we used the ATH1 GeneChip microarray to investigate transcript abundance in different Arabidopsis thaliana genotypes. Arabidopsis thaliana (accession Columbia) were grown in the greenhouse under constant temperature of 20°C, 35% humidity and a 18-h light period. 18 days old plants were harvested and immediately frozen in liquid nitrogen. Six individual plants were pooled per replicate.

ORGANISM(S): Arabidopsis thaliana

SUBMITTER: Dierk Wanke

PROVIDER: E-GEOD-68437 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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The Arabidopsis GAGA-binding factor BPC6 recruits PRC1 component LHP1 to GAGA DNA-motifs

Project description:Plant BBR/BPC transcription factors contain the conserved Basic-Pentacystein (BPC) DNA-binding domain. Arabidopsis group II BBR/BPC proteins interact with PRC1 component LHP1 in vivo. Microarray experiments with Arabidopsis bpc4 bpc6, lhp1-4 and lhp1-4 bpc4 bpc6 suggest an importance of this interaction in the concerted repression of homeotic genes. In this study, we used the ATH1 GeneChip microarray to investigate transcript abundance in different Arabidopsis thaliana genotypes.

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The Enzyme-Like Domain of Arabidopsis Nuclear Beta-Amylases is Critical During DNA Sequence Recognition and Transcriptional Activation

Project description:Plant BZR1-BAM transcription factors contain a M-NM-2-amylase (BAM)-like domain, characteristic of proteins involved in starch breakdown. The enzyme-derived domains appear to be non-catalytic, but determine the function of the Arabidopsis thaliana BZR1-BAMs (BAM7 and BAM8) during transcriptional initiation. Microarray experiments with plants overexpressing different mutant versions of the proteins show that only functional BZR1-BAM variants deregulate gene expression and cause leaf developmental abnormalities. Transcriptional changes caused by overexpression of the BZR1 domain alone indicate that the BAM domain increases selectivity for the preferred cis-regulatory element BBRE (BZR1-BAM Responsive Element). In this study, we used the ATH1 GeneChip microarray to investigate transcript abundance in different Arabidopsis thaliana genotypes. Arabidopsis thaliana (accession Columbia) were grown in a nutrient-rich, medium-grade, peat-based compost in Percival AR95 growth chambers (CLF Plant Climatics) at a constant temperature of 20M-BM-0C, 70% humidity and a 12-h light period with constant, uniform light intensity of 150 M-NM-<molM-bM-^@M-"m-2M-bM-^@M-"s-1. Three-week-old plants were harvested 4 h after onset of the light period and immediately frozen in liquid nitrogen. Fourteen individual plants were pooled per replicate.

2014-06-10 | E-GEOD-58370 | biostudies-arrayexpress

Gene expression in clf and lhp1

Project description:Transcriptome changes in leaves of PcG protein mutants clf and lhp1. Fully expanded rosette leaf 6 was collected from 10 35-d-old plants grown in short day photoperiods.

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LHP1 and H3K27me3 distribution in Arabidopsis thaliana

Project description:Detection of genome-wide distribution of LHP1 and H3K27me3 in the two accessions Col and Ler of A. thaliana

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Transcription profiling of Arabidopsis thaliana seedlings treated with synthetic defense elicitors 3,5-Dichloroanthranilic acid (DCA) and 2,6-Dichloroisonicotinic acid (INA)

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LHP1 interacts with ATRX through plant-specific domains at specific loci targeted by PRC2

Project description:Heterochromatin Protein 1 (HP1) is a major regulator of chromatin structure and function. In animals, the network of proteins interacting with HP1 is mainly associated with constitutive heterochromatin marked by H3K9me3. HP1 physically interacts with the putative orthologue of the SNF2 chromatin remodeler ATRX, which controls deposition of the histone variant H3.3 in mammals. In Arabidopsis thaliana, we show that the orthologue of ATRX participates in H3.3 deposition and characterize the function of conserved domains of plant ATRX. We show that the plant Like HP1 (LHP1) interacts with ATRX through domains that evolved specifically in land plants ancestors. Interaction between ATRX and LHP1 affects the expression of a limited subset of genes controlled by the POLYCOMB REPRESSIVE COMPLEX 2 (PRC2), including the flowering time regulator FLC. In the context of flowering time, ATRX function requires the novel LHP1-interacting domain and the ATPase of the ATRX SNF2 helicase. We conclude that distinct evolutionary pathways led to interaction between ATRX and HP1 in mammals or its counterpart LHP1 in plants, resulting in distinct modes of transcriptional regulation.

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The Arabidopsis chromodomain-containing LHP1 colocalizes with histone H3 lysine27 trimethylation

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Volatiles of two growth-inhibiting rhizobacteria commonly enroll AtWRKY18 function

Project description:Volatiles of certain rhizobacteria can cause growth inhibitory effects on plants/ Arabidopsis thaliana. How these effects are initiated and which mechanisms are enrolled is not yet understood. Obviously the plant can survive/live with the bacteria in the soil, which suggest the existance of a regulatory mechanism/network that provide the possibility for coexistance with the bacteria. To shed light on this regulatory mechanism/network we performed a microarray anlaysis of Arabidopsis thaliana co-cultivated with two different rhizobacteria strains. In this study we used the ATH1 GeneChip microarray to investigate the transcriptional response of 4 to 5 days old Arabidopsis thaliana seedlings at 6 h, 12 h and 24 h exposure to volatiles of the rhizobacteria Serratia plymuthica HRO-C48 or Stenotrophomonas maltophilia R3089. Seedlings from Arabidopsis thaliana were harvested at different time points at exposure to volatiles of two different strains of bacteria. Samples were taken at the start of the experiment (T0) and after 6, 12 and 24 hours (T6, T12, T24 respectively). Two biological replicates from pooled seedlings (from 5 plates, from the respective time points) were used for RNA extraction and hybridization on Affymetrix microarrays (ATH1 GeneChip; GEO accsession GPL198).

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