Insights into the role of C3d dimers in B cell activation and Staphylococcal immune evasion

Insights into the role of C3d dimers in B cell activation and Staphylococcal immune evasion
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深入了解 C3d 二聚体在 B 细胞激活和葡萄球菌免疫逃避中的作用

DOI:
10.1101/2020.04.22.054700
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发表时间:
2020
期刊:
--
影响因子:
--
通讯作者:
Wahid A
Wahid A
中科院分区:
--
文献类型:
--
作者:
Wahid A

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C3裂解为C3 a和C3 b在补体介导的防御的产生中起着重要作用。虽然硫酯介导的表面沉积的C3 b已被很好地研究,C3片段的流体相二聚体仍然在很大程度上未被探索。在这里,我们提出了第一个X射线晶体结构的二硫键连接的人C3 d二聚体,并显示他们进行结构稳定的N-末端结构域交换时,在复杂的金黄色葡萄球菌免疫调节剂Sbi。通过结合研究和流式细胞仪分析,我们揭示了这些二聚体在交联补体受体2和调节B细胞活化以潜在地促进无反应性中的生理相关作用。C3 d二聚体对细胞耐受性的这种潜在诱导可能有助于Sbi介导的S。金免疫逃避以及限制生理条件下的自身反应性免疫应答。因此,从我们的研究结果中获得的见解可以为自身免疫性疾病的新疗法的设计提供信息,并增强我们对补体在液相中的重要性的理解。
Cleavage of C3 to C3a and C3b plays a central role in the generation of complement-mediated defences. Although the thioester-mediated surface deposition of C3b has been well-studied, fluid-phase dimers of C3 fragments remain largely unexplored. Here we present the first X-ray crystal structures of disulphide-linked human C3d dimers and show they undergo structurally-stabilising N-terminal domain swapping when in complex with theStaphylococcus aureusimmunomodulator Sbi. Through binding studies and flow cytometric analyses we uncover the physiologically-relevant roles of these dimers in crosslinking complement receptor 2 and modulating B cell activation to potentially promote anergy. This potential induction of cellular tolerance by C3d dimers could contribute to Sbi-mediatedS. aureusimmune evasion as well as limit autoreactive immune responses under physiological conditions. Thus, insights gained from our findings could inform the design of novel therapies for autoimmune disorders and enhance our understanding surrounding the importance of complement in the fluid phase.
聚合 C3dg 启动人 B 淋巴细胞,以进行抗 IgM 诱导的增殖。
DOI: --
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