Streptococcal M1 Protein Constructs a Pathological Host Fibrinogen NetworkMacheboeuf, P., Buffalo, C., Fu, C.Y., Zinkernagel, A.S., Cole, J.N., Johnson, J.E., Nizet, V., Nizet, V., Ghosh, P.
(2011) Nature 472: 64
- PubMed: 21475196
- DOI: https://doi.org/10.1038/nature09967
- Primary Citation of Related Structures:
- PubMed Abstract:
M1 protein, a major virulence factor of the leading invasive strain of group A Streptococcus, is sufficient to induce toxic-shock-like vascular leakage and tissue injury. These events are triggered by the formation of a complex between M1 and fibrinogen that, unlike M1 or fibrinogen alone, leads to neutrophil activation. Here we provide a structural explanation for the pathological properties of the complex formed between streptococcal M1 and human fibrinogen. A conformationally dynamic coiled-coil dimer of M1 was found to organize four fibrinogen molecules into a specific cross-like pattern. This pattern supported the construction of a supramolecular network that was required for neutrophil activation but was distinct from a fibrin clot. Disruption of this network into other supramolecular assemblies was not tolerated. These results have bearing on the pathophysiology of streptococcal toxic shock.
Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA.