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Published on: October 26, 2017
Conformational restriction of hinge carboxamide leading to potent lactam-based PKMYT1 inhibitors
Yazhou Wang1, Xiaomin Wang1, Chao Wang1
1Insilico Medicine Shanghai Ltd, 9F, Chamtime Plaza Block C, Lane 2889, Jinke Road, Pudong New Area, China.
Abstract:
Through structure-based design to optimize protein kinase membrane-associated tyrosine/threonine 1 (PKMYT1) inhibitors, we developed two distinct conformational restriction strategies: intermolecular hydrogen bonding and cyclization. The hinge-binding carboxamide cyclized derivative B3 demonstrated potent enzymatic inhibition (IC50 = 3.5 nM) and cellular CDK1 phosphorylation suppression (IC50 = 65-114 nM), selectively inhibited proliferation of CCNE1-amplified cancer cells (IC50 = 0.56-0.88 μM) through induction of γH2AX accumulation. Furthermore, compared to the first-in-class PKMYT1 inhibitor RP-6306, B3 exhibited enhanced solubility (176 vs 45 μM) and favorable in vivo metabolic stability (mouse clearance 58.2 vs 85.7 mL/min/kg), underscoring cyclization as a productive design strategy to improve drug-likeness of PKMYT1 inhibitors.
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