Discovery of a ZIP7 inhibitor from a Notch pathway screen
2019
The identification of activating mutations in NOTCH1 in 50% of T cell acute lymphoblastic leukemia has generated interest in elucidating how these mutations contribute to oncogenic transformation and in targeting the pathway. A
phenotypic screenidentified compounds that interfere with trafficking of Notch and induce apoptosis via an endoplasmic reticulum (ER)
stress mechanism. Target identification approaches revealed a role for
SLC39A7(ZIP7), a
zinc transportfamily member, in governing Notch trafficking and signaling. Generation and sequencing of a compound-resistant cell line identified a V430E mutation in ZIP7 that confers transferable resistance to the compound NVS-ZP7-4. NVS-ZP7-4 altered zinc in the ER, and an analog of the compound
photoaffinity labeledZIP7 in cells, suggesting a direct interaction between the compound and ZIP7. NVS-ZP7-4 is the first reported chemical tool to probe the impact of modulating ER zinc levels and investigate ZIP7 as a novel
druggablenode in the Notch pathway.
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