Summary for 9U5S
| Entry DOI | 10.2210/pdb9u5s/pdb |
| EMDB information | 63882 |
| Descriptor | Outer membrane lipoprotein BfpB, Lipoprotein (2 entities in total) |
| Functional Keywords | secretin family, c17 symmetry, t4bp, protein transport |
| Biological source | Escherichia coli O127:H6 str. E2348/69 More |
| Total number of polymer chains | 34 |
| Total formula weight | 1175865.45 |
| Authors | |
| Primary citation | Pei, C.,Sun, H.,Qi, Y.,Li, X.,Fang, Z.,Tang, M.,Zhang, R.,Yan, Z.,Yin, M. Structural insights into the secretin complex of a type IVb pilus system. Nat Commun, 16:9136-9136, 2025 Cited by PubMed Abstract: The bundle-forming pilus (BFP) system in enteropathogenic Escherichia coli (EPEC) produces type IVb pili that enable bacterial auto-aggregation, facilitating bacterial adhesion, colonization, and virulence. One of its components, lipoprotein BfpB, interacts with BfpG to form a secretin channel complex that enables pilus translocation across the outer membrane. Here, we report a high-resolution cryo-EM structure of the BfpB-BfpG complex, revealing a 17:17 stoichiometry with stable zigzag-like interactions between BfpG and BfpB near the N3 ring. Secretin BfpB consists of three β-barrels, including an additional N3 barrel that is crucial for BFP biogenesis. As a lipoprotein-type secretin, BfpB possesses an N-terminal LG domain that bridges the N0 domain and the outer membrane, ensuring its correct localization to the bacterial outer membrane. The C-terminal region of the LG domain mediates binding to BfpG, and disruption of these interactions impairs BFP biogenesis. Our results advance our understanding of the assembly mechanism of secretin complexes within the secretin superfamily. PubMed: 41102207DOI: 10.1038/s41467-025-65063-w PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (2.56 Å) |
Structure validation
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