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© Research
Publication : Science (New York, N.Y.)

Structure of a type IV secretion system core complex

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Science (New York, N.Y.) - 01 Jan 2009

Fronzes R, Schäfer E, Wang L, Saibil HR, Orlova EV, Waksman G

Link to Pubmed [PMID] – 19131631

Science 2009 Jan;323(5911):266-8

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.

http://www.ncbi.nlm.nih.gov/pubmed/19131631