Fig. 1.

Cellular or bacterial derived ROS can alter protein function. (A) Schematic of cysteine oxidation to regulate cell function. (B) Various strains of Lactobacillus were tested for their ability to produce hydrogen peroxide. Bacteria were grown in overnight cultures and the supernatants tested against a negative PBS control for the relative abundance of hydrogen peroxide in a 96-well plate using a ROS-GLO kit. A luminometer was used to quantify the levels of hydrogen peroxide.