Staphylococcus aureus toxin LukSF dissociates from its membrane receptor target to enable renewed ligand sequestration

Staphylococcus aureus toxin LukSF dissociates from its membrane receptor target to enable renewed ligand sequestration
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金黄色葡萄球菌毒素 LukSF 从其膜受体靶点解离,以实现新的配体隔离

DOI:
10.1101/251645
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发表时间:
2018
期刊:
--
影响因子:
--
通讯作者:
Haapasalo K
Haapasalo K
中科院分区:
--
文献类型:
--
作者:
Haapasalo K

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金黄色葡萄球菌潘顿-瓦伦丁杀白素是一种针对人类C5a受体(HC5aR)的成孔毒素,使这种病原体能够通过靶向溶解破坏吞噬细胞来对抗免疫反应。导致细胞快速裂解的机制在很大程度上尚不清楚。在这里,我们表明细胞裂解可能是通过毒素靶向受体簇的过程实现的,并提供了受体“循环”的间接证据,允许多个毒素孔紧密地形成。利用活细胞单分子超分辨成像、Förster共振能量转移和纳米级全内反射荧光共聚焦显微镜,我们可视化了天然对接配体存在下毒素的孔道形成。我们证明了hC5aR从毒素复合体中解离并同时与新的配体结合。这种效应可能会释放移动受体,在微生物感染的早期阶段放大高炎症反应,并对其他几种类似的双组分毒素和新抗生素的设计产生影响。-Haapasalo,K.,Wollman,A.J.M.,de Haas,C.J.C.,van Kessel,K.P.M.,van Strijp,J.A.G.,Leake,M.C.金黄色葡萄球菌毒素LukSF与其膜受体目标解离,使新的连接和隔离成为可能。
Staphylococcus aureus Panton-Valentine leukocidin is a pore-forming toxin targeting the human C5a receptor (hC5aR), enabling this pathogen to battle the immune response by destroying phagocytes through targeted lysis. The mechanisms that contribute to rapid cell lysis are largely unexplored. Here, we show that cell lysis may be enabled by a process of toxins targeting receptor clusters and present indirect evidence for receptor “recycling” that allows multiple toxin pores to be formed close together. With the use of live cell single-molecule super-resolution imaging, Förster resonance energy transfer and nanoscale total internal reflection fluorescence colocalization microscopy, we visualized toxin pore formation in the presence of its natural docking ligand. We demonstrate disassociation of hC5aR from toxin complexes and simultaneous binding of new ligands. This effect may free mobile receptors to amplify hyperinflammatory reactions in early stages of microbial infections and have implications for several other similar bicomponent toxins and the design of new antibiotics.—Haapasalo, K., Wollman, A. J. M., de Haas, C. J. C., van Kessel, K. P. M., van Strijp, J. A. G., Leake, M. C. Staphylococcus aureus toxin LukSF dissociates from its membrane receptor target to enable renewed ligand sequestration.
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