Characterization of Balofloxacin (cas 127294-70-6)-stressed proteomics and identification of Balofloxacin (cas 127294-70-6)-binding proteins pre-peptidase and integration host factor in Edwardsiella tarda
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Add time:08/06/2019 Source:sciencedirect.com
The overuse of antibiotics to control bacterial pathogens leads to the generation of their antibiotic-resistant strains including Edwardsiella tarda. Understanding of mechanisms of the antibiotic resistance is crucial to develop novel methods to manage the infection. Here, two-dimensional electrophoresis-based proteomics was used to characterize balofloxacin-responsive proteins. The altered proteome consisted of 19 proteins with differential abundance, where six metabolic pathways were enriched. The metabolic modulation activated the central carbon metabolism with elevation of NADH, PMF, and ATP. Among the 19 proteins, ETAE_1987 (pre-peptidase) and ETAE_2174 (integration host factor beta subunit) were bound with balofloxacin directly. This was further confirmed by the binding of balofloxacin with recombinant ETAE_1987 and ETAE_2174 using Oxford cup method. Compared with bovine serum albumin, a known balofloxacin-binding protein, ETAE_1987 and ETAE_2174 increased the binding capability by 3.3- and 22-fold, respectively. The combination was validated by microscale thermophoresis. These data characterize the balofloxacin-stressed proteome as a result of the increased central carbon metabolism and energy metabolism and determine ETAE_1987 and ETAE_2174 as balofloxacin-binding proteins. These findings have significant implications in understanding bacterial antibiotic-resistant and drug action mechanisms based on balofloxacin-binding proteins.
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