Structure of a type IV secretion system core complex.
Structure of a type IV secretion system core complex.
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DOI:
10.1126/science.1166101
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发表时间:
2009-01-09
期刊:
影响因子:
--
通讯作者:
Waksman G
中科院分区:
文献类型:
--
作者:
Fronzes R;Schäfer E;Wang L;Saibil HR;Orlova EV;Waksman G
Type IV secretion systems (T4SSs) are important virulence factors used by Gram-negative bacterial pathogens to inject effectors into host cells or spread plasmids harbouring antibiotic resistance genes. We report the 15 Å 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 ~1.1 MDa 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 very different in both architecture and composition from the other known double membrane spanning secretion system that has been structurally characterized.
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