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• W2994883186 abstract "The most frequently mutated oncogene in cancer is KRAS, which uses alternative fourth exons to generate two gene products (KRAS4A and KRAS4B) that differ only in their C-terminal membrane-targeting region1. Because oncogenic mutations occur in exons 2 or 3, two constitutively active KRAS proteins—each capable of transforming cells—are encoded when KRAS is activated by mutation2. No functional distinctions among the splice variants have so far been established. Oncogenic KRAS alters the metabolism of tumour cells3 in several ways, including increased glucose uptake and glycolysis even in the presence of abundant oxygen4 (the Warburg effect). Whereas these metabolic effects of oncogenic KRAS have been explained by transcriptional upregulation of glucose transporters and glycolytic enzymes3–5, it is not known whether there is direct regulation of metabolic enzymes. Here we report a direct, GTP-dependent interaction between KRAS4A and hexokinase 1 (HK1) that alters the activity of the kinase, and thereby establish that HK1 is an effector of KRAS4A. This interaction is unique to KRAS4A because the palmitoylation–depalmitoylation cycle of this RAS isoform enables colocalization with HK1 on the outer mitochondrial membrane. The expression of KRAS4A in cancer may drive unique metabolic vulnerabilities that can be exploited therapeutically. KRAS4A interacts directly with hexokinase 1 in a GTP-dependent manner at the outer mitochondrial membrane, leading to kinase activation and an increase in glucose uptake and glycolysis in tumour cells." @default.
• W2994883186 created "2019-12-26" @default.
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• W2994883186 date "2019-12-11" @default.
• W2994883186 modified "2023-10-10" @default.
• W2994883186 title "KRAS4A directly regulates hexokinase 1" @default.
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• W2994883186 doi "https://doi.org/10.1038/s41586-019-1832-9" @default.
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