VH298 is a cell-permeable small molecule that disrupts the interaction of VHL with Hypoxia-inducible factor HIF-α, stabilizing HIF-α and inducing a hypoxic response.
VH298 is a cell-permeable small molecule that disrupts the interaction of VHL with Hypoxia-inducible factor HIF-α, stabilizing HIF-α and inducing a hypoxic response. Hypoxia-inducible factors (HIFs) are oxygen-sensitive transcription factors that regulate hypoxic signalling. They are regulated by oxygen-dependent prolyl hydroxylase domain (PHD) enzymes and polyubiquitination by the von Hippel–Lindau (VHL) Cullin RING E3 ubiquitin ligase complex. Unlike many PHD inhibitors, which have off-target effects, VH298 acts downstream of the PHD enzymes, inhibiting the VHL:HIF-α interaction. VH298 had a Kd of 90 nM. VH298 was shown to induce HIF transcriptional activity, to increase accumulation of HIF-α in HeLa cells and to stimulate erythropoietin production in RCC4 cells.
Molecules that induce novel interactions between proteins hold great promise for the study of biological systems and the development of therapeutics, but their discovery has been limited by the complexities of rationally designing interactions between three components, and because known
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