Acinetobacter baumannii OxPhos inhibitors as selective anti-infective agents
摘要:
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. (C) 2014 Elsevier Ltd. All rights reserved.
Synthesis, biological evaluation and molecular modeling of substituted 2-aminobenzimidazoles as novel inhibitors of acetylcholinesterase and butyrylcholinesterase
A series of novel 2-aminobenzimidazolederivatives were synthesized under microwave irradiation. Their biological activities were evaluated on acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE). A number of the 2-aminobenzimidazolederivatives showed good inhibitory activities to AChE and BuChE. Among them, compounds 9, 12 and 13 were found to be >25-fold more selective for BuChE than AChE
Acinetobacter baumannii OxPhos inhibitors as selective anti-infective agents
作者:Harvey Rubin、Trevor Selwood、Takahiro Yano、Damian G. Weaver、H. Marie Loughran、Michael J. Costanzo、Richard W. Scott、Jay E. Wrobel、Katie B. Freeman、Allen B. Reitz
DOI:10.1016/j.bmcl.2014.11.020
日期:2015.1
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. (C) 2014 Elsevier Ltd. All rights reserved.