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DAdo regulates plant cell death

ABSTRACT: dAdo regulates plant cell death

PROVIDER: PRJNA862371 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR20648973.fastq.gz	Fastqsanger.gz
	SRR20648974.fastq.gz	Fastqsanger.gz
	SRR20648975.fastq.gz	Fastqsanger.gz
	SRR20648976.fastq.gz	Fastqsanger.gz
	SRR20648977.fastq.gz	Fastqsanger.gz

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dAdo regulates plant cell death

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Autophosphorylation at serine 166 regulates RIPK1-mediated cell death and inflammation

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Tyrosine phosphorylation regulates RIPK1 activity to limit cell death and inflammation

Project description:Receptor-interacting serine/threonine-protein kinase 1 (RIPK1) is a cytosolic protein kinase that regulates multiple inflammatory and cell death pathways. Serine/Threonine phosphorylation of RIPK1 is known to suppress RIPK1 kinase-mediated cell death in the contexts of inflammation, infection and embryogenesis, however, regulation by tyrosine phosphorylation has not been reported. Here, we show that non-receptor tyrosine kinases Janus kinase 1 (JAK1) and SRC are able to phosphorylate RIPK1 at Y384 (Y383 in murine RIPK1), leading to suppression of TNF-induced cell death. Mice bearing a homozygous Ripk1 mutation that prevents tyrosine phosphorylation of RIPK1 (Ripk1Y383F/Y383F), develop systemic inflammation and emergency haematopoiesis. Mechanistically, Ripk1Y383F/Y383F mutation promotes RIPK1 kinase activation and enhances TNF-induced apoptosis and necroptosis, which is partially due to impaired recruitment and activation of MAP kinase-activated protein kinase 2 (MK2). The systemic inflammation and emergency haematopoiesis in Ripk1Y383F/Y383F mice are largely alleviated by RIPK1 kinase inhibition, and prevented by genomic deletions targeted to the upstream pathway (either to Tumor necrosis factor receptor 1 or RIPK3 and Caspase8 simultaneously). In summary, our results demonstrate that tyrosine phosphorylation of RIPK1 is critical for regulating RIPK1 activity to limit cell death and inflammation.

2022-10-12 | PXD036995 | Pride

Auto-phosphorylation at serine 166 regulates RIP kinase 1 mediated cell death and inflammation

Project description:Receptor interacting kinase 1 (RIPK1) regulates cell death and inflammatory responses downstream of TNFR1 and other receptors, and has been implicated in the pathogenesis of inflammatory and degenerative diseases. RIPK1 kinase activity induces cell death by activating apoptosis and necroptosis, however the mechanisms and phosphorylation events regulating RIPK1-dependent cell death signalling remain poorly understood. Here we show that RIPK1 auto-phosphorylation at serine (S) 166 plays a critical role for the activation of RIPK1 kinase-dependent apoptosis and necroptosis. Moreover, we show that S166 phosphorylation is required for RIPK1 kinase-dependent pathogenesis of inflammatory pathologies in vivo in four relevant mouse models. Mechanistically, we provide evidence that trans auto-phosphorylation at S166 modulates RIPK1 kinase activation but is not by itself sufficient for the induction of cell death. These results show that S166 auto-phosphorylation licences RIPK1 kinase activity to induce downstream cell death signalling and inflammation, suggesting that S166 phosphorylation can serve as a reliable biomarker for RIPK1 kinase-dependent pathologies.

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Programmed Cell Death Ligand 1 (PD-L1) Signaling Regulates Macrophage Proliferation and Activation

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PTPN23-dependent ESCRT machinery functions as a cell death checkpoint in restraining multiple cell death pathways

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APIP5 functions as a transcription factor and an RNA-binding protein to modulate cell death and immunity in rice.

Project description:Many transcription factors (TFs) in animals bind to both DNA and mRNA, regulating transcription and mRNA turnover. However, whether plant TFs function at both the transcriptional and posttranscriptional levels remains unknown. The rice (Oryza sativa) bZIP TF AVRPIZ-T-INTERACTING PROTEIN 5 (APIP5) negatively regulates programmed cell death and blast resistance and is targeted by the effector AvrPiz-t of the blast fungus Magnaporthe oryzae. We demonstrate that the nuclear localization signal of APIP5 is essential for APIP5-mediated suppression of cell death and blast resistance. APIP5 directly targets two genes that positively regulate blast resistance: the cell wall-associated kinase gene OsWAK5 and the cytochrome P450 gene CYP72A1. APIP5 inhibits OsWAK5 expression and thus limits lignin accumulation; moreover, APIP5 inhibits CYP72A1 expression and thus limits reactive oxygen species production and defense compounds accumulation. Remarkably, APIP5 acts as an RNA binding protein to regulate mRNA turnover of the cell death- and defense-related genes OsLSD1 and OsRac1. Therefore, APIP5 plays dual roles, acting as TF to regulate gene expression in the nucleus and as an RNA-binding protein to regulate mRNA turnover in the cytoplasm, a previously unidentified regulatory mechanism of plant TFs at the transcriptional and posttranscriptional levels.

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