Aminodeoxychorismate Synthase Inhibitors from One-Bead One-Compound Combinatorial Libraries: “Staged” Inhibitor Design
作者:Seth Dixon、Kristin T. Ziebart、Ze He、Melissa Jeddeloh、Choong Leol Yoo、Xiaobing Wang、Alan Lehman、Kit S. Lam、Michael D. Toney、Mark J. Kurth
DOI:10.1021/jm0609869
日期:2006.12.1
4-Amino-4-deoxychorismate synthase (ADCS) catalyzes the first step in the conversion of chorismate into p-aminobenzoate, which is incorporated into folic acid. We aim to discover compounds that inhibit ADCS and serve as leads for a new class of antimicrobial compounds. This report presents (1) synthesis of a mass-tag encoded library based on a "staged" design, (2) massively parallel fluorescence-based on-bead screening, (3) rapid structural identification of hits, and (4) full kinetic analysis of ADCS. All inhibitors are competitive against chorismate and Mg2+. The most potent ADCS inhibitor identified has a K-i of 360 mu M. We show that the combinatorial diversity elements add substantial binding affinity by interacting with residues outside of but proximal to the active site. The methods presented here constitute a paradigm for inhibitor discovery through active site targeting, enabled by rapid library synthesis, facile massively parallel screening, and straightforward hit identification.