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Potassium (K+ ) is the most abundant intracellular cation and is essential for many physiological functions of all living organisms; however, its role in the pathogenesis of human pathogens is not well understood. In this study, we characterized the functions of the bacterial Trk K+ transport system and external K+ in the pathogenesis ofSalmonella enterica , a major food-borne bacterial pathogen. Here we report that Trk is important forSalmonella to invade and grow inside epithelial cells. It is also necessary for the full virulence ofSalmonella in an animal infection model. Analysis of proteins ofSalmonella indicated that Trk is involved in the expression and secretion of effector proteins of the type III secretion system (TTSS) encoded bySalmonella pathogenicity island 1 (SPI1) that were previously shown to be necessary forSalmonella invasion. In addition to the role of the Trk transporter in the pathogenesis ofSalmonella , we discovered that external K+ modulates the pathogenic properties ofSalmonella by increasing the expression and secretion of effector proteins of the SPI1-encoded TTSS and by enhancing epithelial cell invasion. Our studies demonstrated that K+ is actively involved in the pathogenesis ofSalmonella and indicated thatSalmonella may take advantage of the high K+ content inside host cells and in the intestinal fluid during diarrhea to become more virulent.

The Potassium Transporter Trk and External Potassium Modulate Salmonella enterica Protein Secretion and Virulence