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AtBRO1, BRO1-like domain-containing protein, modulates growth and abiotic stress responses in Arabidopsis

ABSTRACT: AtBRO1, BRO1-like domain-containing protein, modulates growth and abiotic stress responses in Arabidopsis

PROVIDER: PRJNA933625 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR23402900_1.fastq.gz	Fastqsanger.gz
	SRR23402900_2.fastq.gz	Fastqsanger.gz
	SRR23402901_1.fastq.gz	Fastqsanger.gz
	SRR23402901_2.fastq.gz	Fastqsanger.gz
	SRR23402902_1.fastq.gz	Fastqsanger.gz

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AtBRO1, BRO1-like domain-containing protein, modulates growth and abiotic stress responses in Arabidopsis

Project description:Plants physiological mechanisms are affected by Abscisic acid (ABA) via changing gene expression and empowers plants to adapt in numerous environments. Plants have evolved their protection mechanisms for seed germination and abiotic environments to deal with critical harsh conditions. Here, we have explored those changes in Arabidopsis thaliana plants subjected to multiple abiotic stresses. AtBro1 transcripts showed up-regulation in the presence of salt, ABA and mannitol stress conditions. AtBRO1 over-expression lines exhibited robust tolerance to drought and salt stress. Further, ABA elicits resistance responses in loss-of-function bro1-1 mutant plants and AtBro1 positively regulates drought resistance in Arabidopsis. Promoter of AtBro1 fused with GUS showed GUS expression mainly in the rosette leaves and floral clusters, especially in anthers. AtBro1 protein was found to be localized in the plasma membrane of Arabidopsis at the subcellular level by using AtBro1::GFP fusion. Using a broad RNA-sequencing analysis, we observed that early transcriptional responses prompted by ABA induction exhibit specific quantitative differences at different time points, suggesting that ABA stimulates resistance responses in bro1-1 mutant plants. Additionally, transcripts levels of MOP9.5, MRD1, HEI10, and MIOX4 were altered in loss-of-function mutant plants which are involved in different stress conditions. Collectively, our results have shown that AtBro1 is involved in a significant role by regulating plant transcriptional response to ABA and induction of resistance response against abiotic stress.

2023-04-18 | GSE225062 | GEO

The Bro1-like domain-containing protein, AtBro1, modulates growth and abiotic stress responses in Arabidopsis.

Project description:Abscisic acid (ABA) affects plant physiology by altering gene expression, enabling plants to adapt to a wide range of environments. Plants have evolved protective mechanisms to allow seed germination in harsh conditions. Here, we explore a subset of these mechanisms involving the AtBro1 gene, which encodes one of a small family of poorly characterised Bro1-like domain-containing proteins, in Arabidopsis thaliana plants subjected to multiple abiotic stresses. AtBro1 transcripts were upregulated by salt, ABA and mannitol stress, while AtBro1-overexpression lines demonstrated robust tolerance to drought and salt stress. Furthermore, we found that ABA elicits stress-resistance responses in loss-of-function bro1-1 mutant plants and AtBro1 regulates drought resistance in Arabidopsis. When the AtBro1 promoter was fused to the β-glucuronidase (GUS) gene and introduced into plants, GUS was expressed mainly in rosette leaves and floral clusters, especially in anthers. Using a construct expressing an AtBro1-GFP fusion protein, AtBro1 was found to be localized in the plasma membrane in Arabidopsis protoplasts. A broad RNA-sequencing analysis revealed specific quantitative differences in the early transcriptional responses to ABA treatment between wild-type and loss-of-function bro1-1 mutant plants, suggesting that ABA stimulates stress-resistance responses via AtBro1. Additionally, transcripts levels of MOP9.5, MRD1, HEI10, and MIOX4 were altered in bro1-1 plants exposed to different stress conditions. Collectively, our results show that AtBro1 plays a significant role in the regulation of the plant transcriptional response to ABA and the induction of resistance responses to abiotic stress.

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The tetratricopeptide repeat and J-domain containing proteins DJC31 and DJC62 are involved in abiotic stress response in Arabidopsis thaliana

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Project description:Histone methyl groups can be removed by histone demethylases. Although LSD1 and JmjC domain-containing proteins have been identified to be histone demethylases, enzymes responsible for many histone methylation states or sites are not identified. Here, we performed a high-content cell-based screening of a cDNA library containing 2,500 nuclear proteins and identified KDM10A as a histone demethylase specific for histone H4 lysine 20 (H4K20). Ectopic expression of KDM10A reduced the global levels of H4K20me1/2/3 in 293T cells. In vitro, KDM10A specifically demethylated H4K20me1/2/3 and generated formaldehyde. The enzymatic activity required Fe(II) and α-ketoglutarate as cofactors. Domain mapping indicated that the demethylase activity required its UBA domain. We also demonstrated that KDM10B, a protein homologous to KDM10A, had H4K20 demethylase activity in vitro and in vivo. ChIP-seq reveals that KDM10A/B demethylated H4K20 methylation at specific genomic loci in vivo. We further demonstrated that KDM10A/B activated the transcription of coding genes by demethylating H4K20me1 in the gene body, and the transcription of repetitive elements by demethylating H4K20me3 in intergenic regions. NMR analyses demonstrated that an HxxxE motif in the UBA domain is crucial for iron binding, mutation of these two residues abolished iron binding and the demethylase activity. Thus, we identified a family of UBA domain-containing proteins as histone demethylases.

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