(±)-Dehydroaltenusin, an antibiotic , is a selective eukaryotic DNA polymerase α (pol α) inhibitor with an IC 50 of 0.68 μM. (±)-Dehydroaltenusin can be isolated from fungus Alternaria tenuis . (±)-Dehydroaltenusin competitively inhibits the DNA template primer ( K i : 0.23 μM) and non-competitively suppresses the 2'-deoxyribonucleoside 5'-triphosphate substrate ( K i : 0.18 μM). (±)-Dehydroaltenusin induces the cancer cell S-phase cycle arrest and apoptosis . (±)-Dehydroaltenusin can be used for cancers like human adenocarcinoma research.
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