Cryo-EM structure of Escherichia coli HPII catalase serendipitously co-purified with a recombinant adhesin construct.
Catalases are key antioxidant enzymes that protect aerobic organisms from reactive oxygen species generated through metabolic activities and host immune responses. In Escherichia coli, the monofunctional HPII catalase (encoded by katE) forms a stable tetrameric enzyme that contributes to oxidative stress resistance. Du...