Utilization of Nitrophenylphosphates and Oxime-Based Ligation for the Development of Nanomolar Affinity Inhibitors of the <i>Yersinia pestis</i> Outer Protein H (YopH) Phosphatase
作者:Medhanit Bahta、George T. Lountos、Beverly Dyas、Sung-Eun Kim、Robert G. Ulrich、David S. Waugh、Terrence R. Burke
DOI:10.1021/jm200022g
日期:2011.4.28
Our current study reports the first K(M) optimization of a library of nitrophenylphosphate-containing substrates for generating an inhibitor lead against the Yersinia pestis outer protein phosphatase (YopH). A high activity substrate identified by this method (K(M) = 80 mu M) was converted from a subs trate into an inhibitor by replacement of its phosphate group with difluoromethylphosphonic acid, and by attachment of an aminooxy handle for further structural optimization by mime ligation. A cocrystal structure of this aminooxy-containing platform in complex with YopH allowed the identification of a conserved water molecule proximal to the aminooxy group that was subsequenly employed for the design of furanyl-based oxime derivatives. By this process, a potent (IC(50) = 190 nM) and nonpromiscuous inhibitor was developed with good YopH selectivity relative to a panel of phosphatases. The inhibitor showed significant inhibition Of intracellular Y pestis replication at a noncytotoxic concentration. The current work presents general approaches to PTP inhibitor development that may be useful beyond YopH.