Proteomic profile of multidrug-resistant Serratia marcescens under meropenem challenge.

Serratia marcescens is an opportunistic bacterium implicated in the prevalence of serious nosocomial infections and increased outbreaks in Intensive Care Units (ICUs) and Neonatal Intensive Care Units (NICUs). S. marcescens strains are resistant to several antimicrobial classes and express numerous virulence factors that promote pathogenicity. In the present study, the proteomic profile of the multidrug-resistant (MDR) S. marcescens clinical isolate challenged with the antimicrobial meropenem was evaluated. The proteins obtained were analyzed using liquid chromatography coupled with tandem mass spectrometry (LC-MSE). A total of 199 induced proteins were identified revealing that multidrug-resistant S. marcescens promotes increasing of proteins related to energy metabolism and efflux pump and decreases synthesis of proteins related to oxidative stress response and cell mobility upon meropenem challenge, shedding some light on the relationship between expressed proteins and bacterial pathogenicity after antimicrobial induction.