Streptococcal M1 protein constructs a pathological host fibrinogen network.

Streptococcal M1 protein constructs a pathological host fibrinogen network.
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DOI:
10.1038/nature09967
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发表时间:
2011-04-07
期刊:
影响因子:
64.8
通讯作者:
Ghosh, Partho
Ghosh, Partho
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Macheboeuf, Pauline;Buffalo, Cosmo;Fu, Chi-yu;Zinkernagel, Annelies S.;Cole, Jason N.;Johnson, John E.;Nizet, Victor;Ghosh, Partho

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M1蛋白是A组链球菌主要侵袭性菌株的主要毒力因子,足以引起中毒性休克样血管渗漏和组织损伤。这些事件是由M1和纤维蛋白原(Fg)之间形成复合物触发的,与单独的M1或Fg不同,该复合物导致中性粒细胞活化。在这里,我们提供了一个结构解释的病理性质的M1-Fg复合物。一个构象动态卷曲螺旋二聚体的M1被发现组织成一个特定的交叉样模式的四个Fg分子。这种模式支持了中性粒细胞活化所需的超分子网络的构建,但与纤维蛋白凝块不同。这种网络破坏成其他超分子组装是不能容忍的。这些结果与链球菌中毒性休克的病理生理学有关。
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 (Fg) that, unlike M1 or Fg alone, leads to neutrophil activation. Here we provide a structural explanation for the pathological properties of the M1-Fg complex. A conformationally dynamic coiled-coil dimer of M1 was found to organize four Fg 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.
DOI: 10.2144/01311st05
发表时间: 2001-07-01
期刊: BIOTECHNIQUES
影响因子: 2.7
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