Discovery of a novel class of highly potent inhibitors of the p53–MDM2 interaction by structure-based design starting from a conformational argument

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Abstract

The p53–MDM2 interaction is an anticancer drug target under investigation in the clinic. Our compound NVP-CGM097 is one of the small molecule inhibitors of this protein–protein interaction currently evaluated in cancer patients. As part of our effort to identify new classes of p53–MDM2 inhibitors that could lead to additional clinical candidates, we report here the design of highly potent inhibitors having a pyrazolopyrrolidinone core structure. The conception of these new inhibitors originated in a consideration on the MDM2 bound conformation of the dihydroisoquinolinone class of inhibitors to which NVP-CGM097 belongs. This work forms the foundation of the discovery of HDM201, a second generation p53–MDM2 inhibitor that recently entered phase I clinical trial.

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    Citation Excerpt :

    Siremadlin, also named NVP-HDM201, discovered by scientists in Novartis, is a novel potent MDM2 inhibitor, bearing imidazolopyrrolidinone core [47], which is currently being evaluated in 10 clinical trials for the treatment of myelofibrosis, acute myeloid leukemia, colorectal cancer, advanced cancer, metastatic cancer, malignant solid tumor, myelodysplastic syndrome, liposarcoma, uveal melanoma, non-small cell lung carcinoma, triple-negative breast cancer, renal cell carcinoma, advanced solid, and hematological TP53 wt tumors (Table 1). In 2016, Furet et al. in Novartis reported the discovery of compound 18 (Fig. 11A) after screening the Novartis compound collection and further optimization of the hit compound, which effectively inhibited MDM2 with an IC50 value of 0.13 nM [47]. The cocrystal structure of 18 with MDM2 indicated that 18 fitted into the three typical active pockets of MDM2 (Leu-26, Trp-23, and Phe-19, Fig. 11B) [47].

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