9N2E

Cryo-EM structure of F. johnsoniae BamAP

Summary for 9N2E

• Entry DOI: 10.2210/pdb9n2e/pdb
• EMDB information: 48836
• Descriptor: Surface antigen (D15), CarboxypepD_reg-like domain-containing protein (2 entities in total)
• Functional Keywords: bamap complex, bama, bamp, outer-membrane proteins, omp, membrane protein
• Biological source: Flavobacterium johnsoniae UW101; More
• Total number of polymer chains: 2
• Total formula weight: 129904.06

Authors

Deme, J.C.,Lea, S.M. (deposition date: 2025-01-28, release date: 2025-07-09, Last modification date: 2026-01-21)

Primary citation

Liu, X.,Avramova, M.,Deme, J.C.,Jones, R.L.,Lundgren, C.A.K.,Lea, S.M.,Berks, B.C.
A shared mechanism for Bacteroidota protein transport and gliding motility.
Nat Commun, 16:10217-10217, 2025

PubMed Abstract: Bacteria of the phylum Bacteroidota are major human commensals and pathogens in addition to being abundant members of the wider biosphere. Bacteroidota move by gliding and they export proteins using the Type 9 Secretion System (T9SS). Here we discover that gliding motility and the T9SS share an unprecedented mechanism of energisation in which outer membrane proteins are covalently attached by disulfide bonds to a moving internal track structure that propels them laterally through the membrane. We determined the structure of an exemplar Bacteroidota mobile track by obtaining the cryoEM structure of a 3 MDa circular mini-track from Porphyromonas gingivalis. Our discoveries identify a mechanistic and evolutionary link between gliding motility and T9SS-dependent protein transport.

PubMed: 41266322
DOI: 10.1038/s41467-025-65003-8

Experimental method

ELECTRON MICROSCOPY (3.7 Å)