Bernhard Erni

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About

Bernhard Erni is a leading authority in bacterial carbohydrate transport and metabolism, with a career dedicated to unraveling the molecular machinery of the phosphoenolpyruvate-dependent phosphotransferase system (PTS). His research focuses on how bacteria like *Escherichia coli* sense, import, and catabolize sugars, with particular emphasis on the glucose-specific PTS components IICB^Glc and IIA^Glc. Erni’s major contributions include elucidating the genetic and regulatory requirements for growth on rare sugar isomers, as exemplified by his highly cited 2006 study on methyl-α-D-glucopyranoside and sucrose analogs. This work demonstrated that intracellular accumulation of phosphorylated sugar analogs can be toxic, revealing critical checkpoints in bacterial metabolism. With over 20 citations, this paper remains foundational for researchers studying PTS-dependent sugar toxicity and metabolic engineering. Erni’s broader impact includes pioneering biochemical and genetic approaches to map PTS substrate specificity and regulation, providing essential tools for understanding bacterial pathogenesis and developing antimicrobial strategies. His meticulous characterization of transport mutants continues to inform synthetic biology efforts to reprogram bacterial sugar utilization for biotechnology applications.