Enteropathogenic Escherichia coli produces bundle-forming pili that facilitate bacterial adhesion and colonization. Here, the authors report a high-resolution structure of the BfpB-BfpG secretin channel complex, which enables pilus translocation across the outer membrane, revealing an unusual 17:17 stoichiometry and providing insights into its assembly mechanism.
- Chenchen Pei
- Hui Sun
- Meng Yin