ArticleThe EMBO journal2026
Pho84/GLUT2 are cellular myo-inositol exporters regulated by inositol pyrophosphates.
Article in The EMBO journal, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Inositol is an essential nutrient for most living organisms, as combinatorial phosphorylation on this cyclic sugar generates key cellular messengers, such as lipid-bound phosphoinositides (PtdInsPs), water-soluble inositol phosphates (InsPs), and high-energy inositol pyrophosphates (PP-InsPs). Although the kinases and phosphatases modifying inositol-derived molecules are well-characterised, the molecular pathways controlling the cellular homeostasis of the inositol backbone and transport carriers remain unclear. Using a combination of LC-MS analysis and a screen based on the inositol-exporting opi1Δ mutant yeast, we here discovered that inositol export is tightly regulated by PP-InsPs and that the high-affinity phosphate transporter Pho84 also acts as an inositol exporter. We further expanded these observations to the mammalian system and revealed that inositol export in human cells is similarly controlled by PP-InsPs, and that the human homolog of the yeast Pho84, GLUT2, contributes to inositol export. In summary, we discovered an evolutionarily conserved crosstalk pathway linking PP-InsPs to both phosphate and inositol homeostasis.
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