College of Pharmaceutical Science, Institute of Drug Development & Chemical Biology (IDD &CB), Collaborative Innovation Center of Yangtza River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou 310014, PR China. Electronic address: [Email]
Organotellurium compounds have been reported as an immune-modulator sensitizing chemotherapeutics. Herein, we report the design and synthesis of a series of novel tellurodibenzoic acids as mimics of diphenylarsenic acid (DPAA) and potential selective KGA inhibitors. Representative compound 3B exhibited potent inhibition of KGA and glutamine-dependent HCT-116 cells. Stability experiments indicated that 3B has excellent stability under acidic (HCOOH), basic (NH3·H2O) and oxidative (H2O2) conditions, but reacts with β-ME, DTT and lysine which suggested that compound 3B may interact with cysteine or lysine residues. Moreover, molecular docking disclosed that compound 3B binds to the allosteric site of the GAC tetramer containing Arg317-Lys320-Leu321-Phe322-Tyr394-Glu325, which helped to rationalize the SAR and further design and optimization. Taken together, compound 3B could be used as a starting point for the development of new KGA inhibitors.