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BCL7A and BCL7B potentiate SWI/SNF-complex-mediated chromatin accessibility to regulate gene expression and vegetative phase transition in plants

ABSTRACT: Switch defective/sucrose non-fermentable (SWI/SNF) chromatin remodeling complexes are multi-subunit machineries that establish and maintain chromatin accessibility and gene expression by regulating chromatin structure. However, how the remodeling activities of SWI/SNF complexes are regulated in eukaryotes remains elusive. B-cell lymphoma/leukemia protein 7A/B/C (BCL7A/B/C) have been reported as subunits of SWI/SNF complexes for decades in animals and recently in plants; however, the role of BCL7 subunits in SWI/SNF function remains undefined. Here, we identify a unique role for plant BCL7A and BCL7B homologous subunits in potentiating the genome-wide chromatin remodeling activities of BRAHMA-SWI/SNF complexes in plants. BCL7A/B require the catalytic ATPase BRAHMA (BRM) to assemble with the signature subunits of the BRM-SWI/SNF complexes and for genomic binding at a subset of target genes. Loss of BCL7A and BCL7B diminishes BRM-mediated genome-wide chromatin accessibility without changing the stability and genomic targeting of the BRM-SWI/SNF complex, highlighting the specialized role of BCL7A/B in regulating remodeling activity. We further show that BCL7A/B fine-tunes the remodeling activity of BRM-SWI/SNF complexes to generate accessible chromatin at the juvenility resetting region (JRR) of the microRNAs MIR156A/C for plant juvenile identity maintenance. In summary, our work uncovers the function of previously elusive SWI/SNF subunits in multicellular eukaryotes and provides insights into the mechanisms whereby plants memorize the juvenile identity through SWI/SNF-mediated control of chromatin accessibility.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE215295 | GEO | 2024/01/03

REPOSITORIES: GEO

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Project description:Switch defective/sucrose non-fermentable chromatin remodeling complexes are multi-subunit machines that play vital roles in regulating chromatin structure and gene expression. However, how SWI/SNF complexes recognize target loci is still not fully understood. Here, we show that Arabidopsis bromodomain-containing homologous proteins, BRD1, BRD2 and BRD13, are core subunits of SWI/SNF complexes that are required for SWI/SNF genomic targeting. The three BRDs directly interact with multiple SWI/SNF subunits, including the BRAHMA (BRM) catalytic subunit. Phenotypic and transcriptome analysis of the brd1 brd2 brd13 triple mutants showed that the BRDs act in large redundancy to control developmental processes and gene expression that are also regulated by BRM. BRDs extensively co-localize with BRM on chromatin. brd1 brd2 brd13 mutation results in the reduced BRM protein levels and genome-wide targeting on chromatin. Finally, we demonstrate that the bromodomain of BRD2 is essential for genomic targeting of BRD2, highlighting the role of this reader domain in the recruitment of BRM-containing SWI/SNF complexes to target sites in plants. SWI/SNF chromatin remodeling complexes are evolutionarily conserved and is confirmed to use the energy derived from hydrolysis of ATP to alter the density or the position of nucleosomes on the DNA or the composition of histone octamer. Bromodomain, an acetylated histone interaction module, was found in chromatin remodeling factors. During the 29 Arabidopsis bromodomain-containing protein, like GCN5 and GTE4/6, their function has been reported. Here, we reported three BRM-interacting bromodomain-containing protein, BRD1, BRD2 and BRD13 are new core subunits of Arabidopsis SWI/SNF complexes. brd1/2/13 displayed a similar phenotype like brm, such as down-ward curled leaves, reduced fertility, shorter silique and root. Moreover, brm brd1/2/13 shows more serious phenotype just like brm-1. Y2H, Co-IP, RNA-seq and ChIP-seq assay reveal that BRDs interact with BRM at both protein and chromatin level. Future more, BRDs are required for BRM genome-wide occupancy and BRM might bind to chromatin via BRDs bromodomain by interacting with their BBC domain.

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BCL7A and BCL7B potentiate SWI/SNF-complex-mediated chromatin accessibility to regulate gene expression and vegetative phase transition in plants

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