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ENO1 suppresses cancer cell ferroptosis by degrading the mRNA of iron regulatory protein 1

ABSTRACT: ENO1 (α-Enolase 1) is a key glycolytic enzyme that catalyzes the dehydratation of 2-phosphoglycerate to phosphoenolpyruvate. It also belongs to a member of the RNA degradosome of Escherichia coli and facilitates RNA degradation, but it’s currently unknown whether ENO1 possesses similar function in eukaryotes. To test this possibility,we performed RNA-seq assays expressing NTC or ENO1 shRNA, respectively.

ORGANISM(S): Homo sapiens

PROVIDER: GSE153989 | GEO | 2021/09/10

REPOSITORIES: GEO

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ENO1 couples HDAC1 to regulate histone lactylation and gene transcription

Project description:Histone deacetylases (HDACs) are essential transcriptional regulators that mediate gene expression through the complexes they are involved in. Thus, deciphering the HDAC-associated proteins is key to elucidating the underlying mechanisms. Here we present an efficient tool, termed heterobifunctional molecule-enabled proximity labeling strategy (BimPL), to investigate endogenous HDAC neighboring proteins in living cells. Leveraging BimPL and quantitative proteomics, we enable the robust capture of several known HDAC complexes as well as numerous putative HDAC interactors such as glycolytic enzyme enolase-1 (ENO1). Through biochemical studies and CUT&Tag analysis, we uncovered that nuclear ENO1 interacts with HDAC1, which in turn blunts the activity of HDAC1 via locally generated phosphoenolpyruvate (PEP), thereby mediating histone lysine lactylation (Kla) and gene transcription. Our study offers a versatile tool for systematic exploring endogenous protein complexes, as well as provides insight into the unidentified function of ENO1 in the regulation of histone Kla and liver tumor progression.

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ENO1 promotes liver carcinogenesis through YAP1-dependent arachidonic acid metabolism

Project description:Enolase 1 (ENO1) is a glycolytic enzyme that plays essential roles in various pathological activities including cancer development. However, the mechanisms underlying ENO1-contributed tumorigenesis are not well explained. Here, we uncover that ENO1, as an RNA-binding protein, binds to the cytosine-uracil-guanine-rich elements of YAP1 messenger RNA to promote its translation. ENO1 and YAP1 positively regulate alternative arachidonic acid (AA) metabolism by inverse regulation of PLCB1 and HPGD (15-hydroxyprostaglandin dehydrogenase). The YAP1/PLCB1/HPGD axis-mediated activation of AA metabolism and subsequent accumulation of prostaglandin E2 (PGE2) are responsible for ENO1-mediated cancer progression, which can be retarded by aspirin. Finally, aberrant activation of ENO1/YAP1/PLCB1 and decreased HPGD expression in clinical hepatocellular carcinoma samples indicate a potential correlation between ENO1-regulated AA metabolism and cancer development. These findings underline a new function of ENO1 in regulating AA metabolism and tumorigenesis, suggesting a therapeutic potential for aspirin in patients with liver cancer with aberrant expression of ENO1 or YAP1.

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Project description:The essential roles of PCNA as a scaffold protein in DNA replication and repair are well established, while its more recently discovered cytosolic roles are less explored. Alpha-enolase (ENO1) and 6-phosphogluconate dehydrogenase (6PGD), important proteins in glycolysis and the Pentose Phosphate Pathway (PPP), respectively, both contain PCNA interacting motifs. Here we show reduced binding to PCNA when the PCNA interacting motif APIM in ENO1 is mutated. Mutant cells have lower ENO1 protein levels, have reduced glucose consumption, altered glycolytic metabolite and nucleoside phosphate pools and increased activation of the citric acid cycle (TCA) compared to parental cells. Treatment of a panel of haematological cell lines with a cell penetrating peptide containing APIM (ATX-101), lead to a metabolic shift with reduction in glycolytic metabolite and nucleoside phosphate pools as well reduced levels of ENO1 and 6PGD proteins. These results suggests that PCNA stabilize ENO1 and 6PGD, and that targeting PCNA reduce the glycolysis, PPP and nucleoside phosphate pools via destabilization of these proteins.

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