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Purine nucleoside phosphorylase enables dual metabolic checkpoints that prevent T cell immunodeficiency and TLR7-associated autoimmunity

ABSTRACT: Purine nucleoside phosphorylase enables dual metabolic checkpoints that prevent T cell immunodeficiency and TLR7-associated autoimmunity

PROVIDER: PRJNA837995 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR19206144.fastq.gz	Fastqsanger.gz
	SRR19206145.fastq.gz	Fastqsanger.gz
	SRR19206146.fastq.gz	Fastqsanger.gz
	SRR19206147.fastq.gz	Fastqsanger.gz
	SRR19206148.fastq.gz	Fastqsanger.gz

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Similar Datasets

Purine nucleoside phosphorylase enables dual metabolic checkpoints that prevent T cell immunodeficiency and TLR7-associated autoimmunity

Project description:Purine nucleoside phosphorylase (PNP) enables the breakdown and recycling of guanine nucleosides. PNP insufficiency in humans is paradoxically associated with both immunodeficiency and autoimmunity, but the mechanistic basis for these outcomes is incompletely understood. Here we identify two immune lineage-dependent consequences of PNP inactivation dictated by distinct gene interactions. During T cell development, PNP inactivation is synthetically lethal with down-regulation of the dNTP triphosphohydrolase SAMHD1. This interaction requires deoxycytidine kinase activity and is antagonized by microenvironmental deoxycytidine. In B lymphocytes and macrophages, PNP regulates Toll like receptor 7 signaling by controlling the levels of its (deoxy)guanosine nucleoside ligands. Overriding this regulatory mechanism promotes germinal center formation in the absence of exogenous antigen and accelerates disease in a mouse model of autoimmunity. This work reveals that one purine metabolism gene protects against immunodeficiency and autoimmunity via independent mechanisms operating in distinct immune lineages and identifies PNP as a novel metabolic immune checkpoint.

2022-06-02 | GSE203003 | GEO

Purine nucleoside phosphorylase enables dual metabolic checkpoints that prevent T cell immunodeficiency and TLR7-associated autoimmunity.

Project description:Purine nucleoside phosphorylase (PNP) enables the breakdown and recycling of guanine nucleosides. PNP insufficiency in humans is paradoxically associated with both immunodeficiency and autoimmunity, but the mechanistic basis for these outcomes is incompletely understood. Here, we identify two immune lineage-dependent consequences of PNP inactivation dictated by distinct gene interactions. During T cell development, PNP inactivation is synthetically lethal with downregulation of the dNTP triphosphohydrolase SAMHD1. This interaction requires deoxycytidine kinase activity and is antagonized by microenvironmental deoxycytidine. In B lymphocytes and macrophages, PNP regulates Toll-like receptor 7 signaling by controlling the levels of its (deoxy)guanosine nucleoside ligands. Overriding this regulatory mechanism promotes germinal center formation in the absence of exogenous antigen and accelerates disease in a mouse model of autoimmunity. This work reveals that one purine metabolism gene protects against immunodeficiency and autoimmunity via independent mechanisms operating in distinct immune lineages and identifies PNP as a potentially novel metabolic immune checkpoint.

| S-EPMC9374381 | biostudies-literature

The search for enzymes responsible for metabolism of nucleoside analogs

Project description:Affymetrix U95Av2 expression data from human intestinal cells (Caco-2) and tissues from all intestinal segments (duodenum, jejunum, ileum, colon). Entries contain the search terms "glycosylase, phosphorylase, cytochrome or nucleoside," which were relevant to our search for enzymes capable of cleaving the N-glycosidic bond of nucleoside analog drugs. Keywords = glycosylase Keywords = phosphorylase Keywords = nucleoside Keywords: parallel sample

2005-10-30 | GSE1862 | GEO

LMP-420: a novel purine nucleoside analogue with potent cytotoxic effects for chronic lymphocytic leukemia cells

Project description:[original title] LMP-420: a novel purine nucleoside analogue with potent cytotoxic effects for chronic lymphocytic leukemia cells and minimal toxicity for normal hematopoietic cells. LMP-420 induces cytotoxicity and apoptosis to CLL cells in vitro without any negative effects to normal immune cells. This gene expression experiment compares CLL cells treated with LMP-420 versus media alone to investigate the mechanism of action of LMP-420. CLL cells from 13 patients were treated with LMP-420 or media for 24 hours, then RNA was extracted and assayed on U133Plus2 GeneChips.

2011-02-01 | E-GEOD-20211 | biostudies-arrayexpress

LMP-420: a novel purine nucleoside analogue with potent cytotoxic effects for chronic lymphocytic leukemia cells

2011-02-01 | GSE20211 | GEO

Structure of grouper iridovirus purine nucleoside phosphorylase.

Project description:Purine nucleoside phosphorylase (PNP) catalyzes the reversible phosphorolysis of purine ribonucleosides to the corresponding free bases and ribose 1-phosphate. The crystal structure of grouper iridovirus PNP (givPNP), corresponding to the first PNP gene to be found in a virus, was determined at 2.4 A resolution. The crystals belonged to space group R3, with unit-cell parameters a = 193.0, c = 105.6 A, and contained four protomers per asymmetric unit. The overall structure of givPNP shows high similarity to mammalian PNPs, having an alpha/beta structure with a nine-stranded mixed beta-barrel flanked by a total of nine alpha-helices. The predicted phosphate-binding and ribose-binding sites are occupied by a phosphate ion and a Tris molecule, respectively. The geometrical arrangement and hydrogen-bonding patterns of the phosphate-binding site are similar to those found in the human and bovine PNP structures. The enzymatic activity assay of givPNP on various substrates revealed that givPNP can only accept 6-oxopurine nucleosides as substrates, which is also suggested by its amino-acid composition and active-site architecture. All these results suggest that givPNP is a homologue of mammalian PNPs in terms of amino-acid sequence, molecular mass, substrate specificity and overall structure, as well as in the composition of the active site.

| S-EPMC2815667 | biostudies-literature

Identification of a transcription factor, PunR, that regulates the purine and purine nucleoside transporter punC in E. coli

Project description:Identification of a transcription factor, PunR, that regulates the purine and purine nucleoside transporter punC in E. coli

| PRJNA701011 | ENA

A beta-fluoroamine inhibitor of purine nucleoside phosphorylase.

Project description:The potent immucillin purine nucleoside phosphorylase (PNP ) inhibitors F-DADMe-ImmH [(3S,4S)-3], and [(3R,4R)-3] are synthesized in seven steps. Cycloaddition to a fluoroalkene and an enzymic resolution are the key features of the construction of the fluoropyrrolidines 11, from which the immucillins are assembled by use of a three-component Mannich reaction. Slow-onset binding constants (Ki(*)) for [(3S,4S)-3] and [(3R,4R)-3] with human PNP are 0.032 and 1.82 nM, respectively. F-DADMe-ImmH [(3S,4S)-3] exhibits oral availability in mice at doses as low as 0.2 mg/kg.

| S-EPMC4508846 | biostudies-literature

A novel transcription factor PunR and Nac are involved in purine and purine nucleoside transporter punC regulation in E. coli

Project description:A novel transcription factor PunR and Nac are involved in purine and purine nucleoside transporter punC regulation in E. coli

| PRJNA725472 | ENA

Inhibition and structure of Toxoplasma gondii purine nucleoside phosphorylase.

Project description:The intracellular pathogen Toxoplasma gondii is a purine auxotroph that relies on purine salvage for proliferation. We have optimized T. gondii purine nucleoside phosphorylase (TgPNP) stability and crystallized TgPNP with phosphate and immucillin-H, a transition-state analogue that has high affinity for the enzyme. Immucillin-H bound to TgPNP with a dissociation constant of 370 pM, the highest affinity of 11 immucillins selected to probe the catalytic site. The specificity for transition-state analogues indicated an early dissociative transition state for TgPNP. Compared to Plasmodium falciparum PNP, large substituents surrounding the 5'-hydroxyl group of inhibitors demonstrate reduced capacity for TgPNP inhibition. Catalytic discrimination against large 5' groups is consistent with the inability of TgPNP to catalyze the phosphorolysis of 5'-methylthioinosine to hypoxanthine. In contrast to mammalian PNP, the 2'-hydroxyl group is crucial for inhibitor binding in the catalytic site of TgPNP. This first crystal structure of TgPNP describes the basis for discrimination against 5'-methylthioinosine and similarly 5'-hydroxy-substituted immucillins; structural differences reflect the unique adaptations of purine salvage pathways of Apicomplexa.

| S-EPMC4060479 | biostudies-literature

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