Acinetobacter baumannii OxPhos inhibitors as selective anti-infective agents

作者：Rubin Harvey^*; Selwood Trevor; Yano Takahiro; Weaver Damian G; Loughran H Marie; Costanzo Michael J; Scott Richard W; Wrobel Jay E; Freeman Katie B; Reitz Allen B

来源：Bioorganic & Medicinal Chemistry Letters, 2015, 25(2): 378-383.

DOI：10.1016/j.bmcl.2014.11.020

• Acinetobacter baumannii
• Oxidative phosphorylation
• Anti-infective
• 2-Iminobenzimidazole

The Gram-negative bacterium Acinetobacter baumannii is an opportunistic pathogen in humans and infections are poorly treated by current therapy. Recent emergence of multi-drug resistant strains and the lack of new antibiotics demand an immediate action for development of new anti-Acinetobacter agents. To this end, oxidative phosphorylation (OxPhos) was identified as a novel target for drug discovery research. Consequently, a library of similar to 10,000 compounds was screened using a membrane-based ATP synthesis assay. One hit identified was the 2-iminobenzimidazole 1 that inhibited the OxPhos of A. baumannii with a modestly high selectivity against mitochondrial OxPhos, and displayed an MIC of 25 mu M (17 mu g/mL) against the pathogen. The 2-iminobenzimidazole 1 was found to inhibit the type 1 NADH-quinone oxidoreductase (NDH-1) of A. baumannii OxPhos by a biochemical approach. Among various derivatives that were synthesized to date, des-hydroxy analog 5 is among the most active with a relatively tight SAR requirement for the N'-aminoalkyl side chain. Analog 5 also showed less cytotoxicity against NIH3T3 and HepG2 mammalian cell lines, demonstrating the potential for this series of compounds as anti-Acinetobacter agents. Additional SAR development and target validation is underway.

• 出版日期2015-1-15