The Porphyromonas gingivalis lipid A 1-phosphatase LpxE requires a functional type IX secretion system for its activity. - Wang, Sunjun; Liu, Yichao; Zhang, Beichang; Aduse-Opoku, Joseph; Buccafusca, Roberto; Ayrton, Oscar; Mastroianni, Giulia; Machado, Pedro; Roberts, Mark A. J.; Curtis, Michael A.; Garnett, James A. (Journal of Oral Microbiology, 2025)