Elucidation and Control of the Molecular Mechanism of Action of the Multifunctional Antitumor Agents Lamellarins

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Marine natural products lamellarins are the multifunctional antitumor agents which inhibit both topoisomerase I and protein kinases(CDKs, GSK-3, Pim1, DYRK1A, CLKs, etc). In this research, we intended to produce target-selective inhibitors through SAR and docking simulation studies. As the results, we established following new facts. The kinase-selective(or topo I-selective) inhibitors can be produced by proper arrangement of the peripheral oxygen functionalities(OH or OMe) on the lamellarin skeleton. The inhibitory activity and selectivity of two enantiomers of 16-methyllamellarin N, which are generated by restricted rotation around C1-C11 single bond, on the protein kinases are quite different. The lamellarin N analogues having a substituent at C1 instead of an aromatic ring exhibited good selectivity on the protein kinases depending on the structure of C1-substituent.