Download MendeleyHelical reconstruction of Salmonella and Shigella needle filaments attached to type 3 basal bodies.
Kotov, V., Lunelli, M., Wald, J., Kolbe, M., Marlovits, T.C.(2021) Biochem Biophys Rep 27: 101039-101039
- PubMed: 34258394
- DOI: https://doi.org/10.1016/j.bbrep.2021.101039
- Primary Citation of Related Structures:
6ZNH, 6ZNI - PubMed Abstract:
Gram-negative pathogens evolved a syringe-like nanomachine, termed type 3 secretion system, to deliver protein effectors into the cytoplasm of host cells. An essential component of this system is a long helical needle filament that protrudes from the bacterial surface and connects the cytoplasms of the bacterium and the eukaryotic cell. Previous structural research was predominantly focused on reconstituted type 3 needle filaments, which lacked the biological context. In this work we introduce a facile procedure to obtain high-resolution cryo-EM structure of needle filaments attached to the basal body of type 3 secretion systems. We validate our approach by solving the structure of Salmonella PrgI filament and demonstrate its utility by obtaining the first high-resolution cryo-EM reconstruction of Shigella MxiH filament. Our work paves the way to systematic structural characterization of attached type 3 needle filaments in the context of mutagenesis studies, protein structural evolution and drug development.
Organizational Affiliation:
Centre for Structural Systems Biology (CSSB), Notkestraße 85, 22607 Hamburg, Germany.
