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• W2744034790 abstract "GDC-0339 is a novel small molecule pan-Pim kinase inhibitor that was discovered as a potential treatment of multiple myeloma. During the in vitro and in vivo metabolite profiling of GDC-0339, a metabolite was detected that had the same elemental composition as the parent but was distinct with respect to its chromatographic separation and mass spectrometric fragmentation pattern. High resolution tandem mass spectrometry data indicated the metabolite was modified at the aminoazepane moiety. The structure was solved by nuclear magnetic resonance analysis of the isolated metabolite and further confirmed by comparing it to a synthetic standard. These results indicated that the metabolite was formed by an intramolecular amine replacement reaction with the primary amine forming a new attachment to pyrazole without any change in stereochemistry. In vitro experiments showed cytochrome P450s catalyzed the reaction and demonstrated high isoform selectivity by CYP1A1. Results from kinetic experiments showed that the CYP1A1-mediated rearrangement of GDC-0339 was an efficient reaction with apparent turnover number (k_cat) and Michaelis constant (K_m) of 8.4 minutes⁻¹ and 0.6 <i>μ</i>M, respectively. The binding of GDC-0339 to the cytochrome P450 active site was examined by characterizing the direct inhibition of CYP1A1-mediated phenacetin <i>O</i>-deethylation, and GDC-0339 was a potent competitive inhibitor with K_i of 0.9 <i>μ</i>M. This high affinity binding was unexpected given a narrow active site for CYP1A1 and GDC-0339 does not conform structurally to known CYP1A1 substrates, which are mostly polyaromatic planar molecules. Further, we explored some of the structural requirements for the rearrangement reaction and identified several analogs to GDC-0339 that undergo this biotransformation." @default.
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• W2744034790 date "2017-08-08" @default.
• W2744034790 modified "2023-10-15" @default.
• W2744034790 title "CYP1A1-Mediated Intramolecular Rearrangement of Aminoazepane in GDC-0339" @default.
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• W2744034790 doi "https://doi.org/10.1124/dmd.117.076786" @default.
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