Antitubercular Nucleosides That Inhibit Siderophore Biosynthesis: SAR of the Glycosyl Domain
作者:Ravindranadh V. Somu、Daniel J. Wilson、Eric M. Bennett、Helena I. Boshoff、Laura Celia、Brian J. Beck、Clifton E. Barry、Courtney C. Aldrich
DOI:10.1021/jm061068d
日期:2006.12.1
Tuberculosis is the leading cause of infectious disease mortality in the world by a bacterial pathogen. We previously demonstrated that a bisubstrate inhibitor of the adenylation enzyme MbtA, which is responsible for the second step of mycobactin biosynthesis, exhibited potent antitubercular activity. Here we systematically investigate the structure-activity relationships of the bisubstrate inhibitor glycosyl domain resulting in the identification of a carbocyclic analogue that possesses a K-I(app) value of 2.3 nM and MIC99 values of 1.56 mu M against M. tuberculosis H37Rv. The SAR data suggest the intriguing possibility that the bisubstrate inhibitors utilize a transporter for entry across the mycobacterial cell envelope. Additionally, we report improved conditions for the expression of MbtA and biochemical analysis, demonstrating that MbtA follows a random sequential enzyme mechanism for the adenylation half-reaction.