Pyrimidine synthase CAD deamidates and inactivates p53
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ABSTRACT:
PROVIDER: PRJNA1209001 | ENA |
REPOSITORIES: ENA
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Project description:p53, a critical tumor suppressor, regulates the cell cycle in response to DNA damage and metabolic changes. While p53 stability and activity are predominantly governed by post-translational modifications, the role of deamidation in modulating p53 function remains unclear. This study demonstrates that 6-diazo-5-oxo-L-norleucine (DON) inhibits CAD, a glutamine amidotransferase, to block p53 deamidation, thereby activating the p53 signaling pathway and suppressing tumor cell proliferation. Metabolomic analyses confirmed that DON inhibits CAD-mediated pyrimidine biosynthesis, but this metabolic disruption is not the primary driver of p53 activation. CAD deamidates p53 at N235 and N239, impairing its transcriptional activity and promoting tumor growth. DON restores p53 function by inhibiting CAD’s deamidase activity. Clinical data revealed elevated CAD expression in tumors with wild-type TP53, correlating with poor patient survival. Our findings uncover a novel mechanism by which CAD suppresses p53 activity via deamidation and propose that DON treatment may benefit cancer patients with wild-type TP53 and high CAD expression.
2025-01-12 | GSE286372 | GEO
Project description:Pyrimidine Triones as Potential Activators of p53 Mutants
| PRJNA1140516 | ENA
Project description:p53 is a crucial tumor suppressor in vertebrates that is frequently mutated in human cancers. Most mutations are missense mutations that render p53 inactive in suppressing tumor initiation and progression. Developing small molecule drugs to convert mutant p53 into an active, wild-type-like conformation is a significant focus for personalized cancer therapy. Prior research indicates that reactivating p53 suppresses cancer cell proliferation and tumor growth in animal models. Early clinical evidence with a compound selectively targeting p53 mutants with substitutions of tyrosine 220 suggests potential therapeutic benefits of reactivating p53 in patients. This study identifies and examines the UCI-1001 compound series as a potential corrector for several p53 mutations. The findings indicate that UCI-1001 treatment in p53 mutant cancer cell lines inhibits growth and reinstates wild-type p53 activities, including DNA binding, target gene activation, and induction of cell death. Cellular thermal shift assays, conformation-specific immunofluorescence staining, and differential scanning fluorometry suggest that UCI-1001 interacts with and alters the conformation of mutant p53 in cancer cells. These initial results identify pyrimidine trione derivatives of the UCI-1001 series as candidates for p53 corrector drug development.
2024-08-05 | GSE273169 | GEO
Project description:Glioblastoma stem cells (GSCs) reprogram glucose metabolism by hijacking high-affinity glucose uptake to survive in a nutritionally dynamic microenvironment. Here, we trace metabolic aberrations in GSCs to link core genetic mutations in glioblastoma to dependency on de novo pyrimidine synthesis. Targeting the pyrimidine synthetic rate-limiting step enzyme CAD (carbamoyl-phosphate synthetase 2, aspartate transcarbamyolase, dihydroorotase) or the critical downstream enzyme, DHODH (dihydroorotate dehydrogenase) inhibited GSC survival, self-renewal, and in vivo tumor initiation through the depletion of the pyrimidine nucleotide supply. Mutations in EGFR or PTEN generated distinct CAD phosphorylation patterns to activate carbon influx through pyrimidine synthesis. Simultaneous abrogation of tumor-specific driver mutations and DHODH activity with clinically approved inhibitors demonstrated sustained inhibition of metabolic activity of pyrimidine synthesis and GSC tumorigenic capacity. Higher expression of pyrimidine synthesis genes portend poor prognosis of glioblastoma patients. Collectively, our results demonstrate a novel therapeutic approach of precision medicine through targeting the nexus between driver mutations and metabolic reprogramming in cancer stem cells.
2019-04-09 | GSE129438 | GEO
Project description:TMPRSS2-ERG fusion is the most common genetic alteration in prostate cancer (PCa) and TP53 is the most frequently mutated gene in human cancers. However, their precise roles in PCa pathogenesis remain elusive. Here we showed that TMPRSS2-ERG fusion co-occurred with TP53 deletion/mutation in PCa patient specimens. ERG overexpression and Trp53 knockout/R172H mutant knockin induced pyrimidine synthesis gene (PSG) expression and prostate tumorigenesis in mice. Gain-of-function p53 mutants bound to the CTNNB1 promoter and upregulated β-Catenin. Overexpressed ERG and β-Catenin co-occupied PSG loci and mediated PSG expression, and high PSG expression associated with increased β-Catenin level and poor overall survival of PCa patients. β-Catenin inhibition by proteolysis-targeting chimeras (PROTACs) of its co-activator CBP and partner proteins LEF1/TCFs blocked ERG/p53-mutant PCa growth. Our study identifies CTNNB1 as a transcriptional target of p53 GOF-mutants, and reveals a druggable dependency on β-Catenin and pyrimidine synthesis in p53-mutated cancers with or without TMPRSS2-ERG fusion.
2023-06-27 | GSE184623 | GEO
Project description:TMPRSS2-ERG fusion is the most common genetic alteration in prostate cancer (PCa) and TP53 is the most frequently mutated gene in human cancers. However, their precise roles in PCa pathogenesis remain elusive. Here we showed that TMPRSS2-ERG fusion co-occurred with TP53 deletion/mutation in PCa patient specimens. ERG overexpression and Trp53 knockout/R172H mutant knockin induced pyrimidine synthesis gene (PSG) expression and prostate tumorigenesis in mice. Gain-of-function p53 mutants bound to the CTNNB1 promoter and upregulated β-Catenin. Overexpressed ERG and β-Catenin co-occupied PSG loci and mediated PSG expression, and high PSG expression associated with increased β-Catenin level and poor overall survival of PCa patients. β-Catenin inhibition by proteolysis-targeting chimeras (PROTACs) of its co-activator CBP and partner proteins LEF1/TCFs blocked ERG/p53-mutant PCa growth. Our study identifies CTNNB1 as a transcriptional target of p53 GOF-mutants, and reveals a druggable dependency on β-Catenin and pyrimidine synthesis in p53-mutated cancers with or without TMPRSS2-ERG fusion.
2023-06-27 | GSE184624 | GEO
Project description:TMPRSS2-ERG fusion is the most common genetic alteration in prostate cancer (PCa) and TP53 is the most frequently mutated gene in human cancers. However, their precise roles in PCa pathogenesis remain elusive. Here we showed that TMPRSS2-ERG fusion co-occurred with TP53 deletion/mutation in PCa patient specimens. ERG overexpression and Trp53 knockout/R172H mutant knockin induced pyrimidine synthesis gene (PSG) expression and prostate tumorigenesis in mice. Gain-of-function p53 mutants bound to the CTNNB1 promoter and upregulated β-Catenin. Overexpressed ERG and β-Catenin co-occupied PSG loci and mediated PSG expression, and high PSG expression associated with increased β-Catenin level and poor overall survival of PCa patients. β-Catenin inhibition by proteolysis-targeting chimeras (PROTACs) of its co-activator CBP and partner proteins LEF1/TCFs blocked ERG/p53-mutant PCa growth. Our study identifies CTNNB1 as a transcriptional target of p53 GOF-mutants, and reveals a druggable dependency on β-Catenin and pyrimidine synthesis in p53-mutated cancers with or without TMPRSS2-ERG fusion.
2023-06-27 | GSE184625 | GEO
Project description:The mitochondrial serine catabolism to formate induces a metabolic switch to a hypermetabolic state with high rates of glycolysis, purine synthesis and pyrimidine synthesis. While formate is a purine precursor it is not obvious link between formate and pyrimidine synthesis. Methods Here we combine phospho-proteome and metabolic profiling to determine how formate induces pyrimidine synthesis. We discover that formate induces CAD phosphorylation. Mechanistically formate induces mTORC1 activity as quantified by S6K1 phosphorylation, which is known to phosphorylate CAD and increase its enzymatic activity. Treatment with the allosteric mTORC1 inhibitor rapamycin abrogates CAD phosphorylation and pyrimidine synthesis induced by formate. We conclude that formate activates mTORC1 and induces pyrimidine synthesis via increasing CAD activity.
2020-09-28 | PXD019347 | Pride
Project description:Metabolic heterogeneity resulting from the intrinsic heterogeneity of human tumors has been shown to cause a myriad of adverse outcomes of tumor therapy, including resistance to chemotherapy, but the mechanisms inside remain largely unknown. Here, we found that the de novo pyrimidine synthesis pathway, which we previously identified as crucial for the proliferation of gastric and colon cancer cells, determines the chemosensitivity of these cancer types. In the chemosensitive cells, chemotherapeutic drugs such as 5-FU promoted the degradation of CAD, an enzyme that is rate-limiting for pyrimidine synthesis, leading to the apoptosis of these cells. We also found that CAD needed to be cleaved, by activated caspase-3 on its Asp1371 residue, before its degradation. Upregulation of CAD, either by overexpression or by a mutation on the Asp1371 to block the caspase-3 cleavage, conferred tumor chemoresistance in both mouse xenograft models and the Cldn18-ATK mouse gastric tumor models. Importantly, mutations related to Asp1371 of CAD were found in gastric tumor samples of patients who underwent unsuccessful neoadjuvant chemotherapy. By searching for a compound that is capable of degradating the CAD-Asp1371 mutant, we discovered that a compound called RMY-186 can be used to treat chemoresistant tumors related to CAD mutations, resulting in a significant improvement in the effectiveness of chemotherapy. We have, therefore, revealed the vulnerability of de novo pyrimidine synthesis during chemotherapy, which can be targeted to overcome chemotherapeutic resistance and augment the antitumor efficacy of genotoxic chemotherapy agents.
2025-01-01 | PXD059365 |
Project description:In this study, we have investigated the effect of p53 deletion on the metabolic activity of colon cancer cells exposed to metabolic stress. In order to recreate the simultaneous reduction in oxygen and nutrient availability found in tumors, we cultured cancer cells as multicellular tumor spheroids. Under these conditions, p53 deficient cancer cells activate the expression of enzymes of the mevalonate pathway via the sterol regulatory element binding protein 2 (SREBP2). Moreover, inhibition of mevalonate pathway activity with statins selectively induced apoptosis in p53 deficient cancer cells exposed to metabolic stress. This effect was mediated by the requirement of p53 deficient cancer cells to synthesise ubiquinone (coenzyme Q10) to maintain TCA cycle activity, respiration and the production of pyrimidine nucleotides. Our study has revealed a novel link between isoprenoid synthesis by the mevalonate pathway and the electron transport function of ubiquinone, which is required for nucleotide biosynthesis. As a consequence, maintaining mevalonate pathway activity is essential for p53 deficient cancer cells to proliferate and survive under the metabolic constraints of the tumor microenvironment.
2019-11-15 | GSE124189 | GEO