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TitleStructure of a type IV secretion system core complex.
Journal, issue, pagesScience, Vol. 323, Issue 5911, Page 266-268, Year 2009
Publish dateJan 9, 2009
AuthorsRémi Fronzes / Eva Schäfer / Luchun Wang / Helen R Saibil / Elena V Orlova / Gabriel Waksman /
PubMed AbstractType IV secretion systems (T4SSs) are important virulence factors used by Gram-negative bacterial pathogens to inject effectors into host cells or to spread plasmids harboring antibiotic resistance ...Type IV secretion systems (T4SSs) are important virulence factors used by Gram-negative bacterial pathogens to inject effectors into host cells or to spread plasmids harboring antibiotic resistance genes. We report the 15 angstrom resolution cryo-electron microscopy structure of the core complex of a T4SS. The core complex is composed of three proteins, each present in 14 copies and forming a approximately 1.1-megadalton two-chambered, double membrane-spanning channel. The structure is double-walled, with each component apparently spanning a large part of the channel. The complex is open on the cytoplasmic side and constricted on the extracellular side. Overall, the T4SS core complex structure is different in both architecture and composition from the other known double membrane-spanning secretion system that has been structurally characterized.
External linksScience / PubMed:19131631 / PubMed Central
MethodsEM (single particle)
Resolution15.0 - 20.0 Å
Structure data

EMDB-5031:
Structure of a type IV secretion system core complex
Method: EM (single particle) / Resolution: 15.0 Å

EMDB-5032:
Structure of a type IV secretion system core complex
Method: EM (single particle) / Resolution: 18.0 Å

EMDB-5033:
Structure of a type IV secretion system core complex
Method: EM (single particle) / Resolution: 19.0 Å

EMDB-5034:
Structure of a type IV secretion system core complex
Method: EM (single particle) / Resolution: 20.0 Å

EMDB-5035:
Structure of a type IV secretion system core complex
Method: EM (single particle) / Resolution: 18.0 Å

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