Targeting properdin - Structure and function of a novel family of tick-derived complement inhibitors

Targeting properdin - Structure and function of a novel family of tick-derived complement inhibitors
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靶向备解素——蜱源补体抑制剂新型家族的结构和功能

DOI:
10.1101/2021.04.02.438250
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发表时间:
2021
期刊:
--
影响因子:
--
通讯作者:
Braunger K
Braunger K
中科院分区:
--
文献类型:
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作者:
Braunger K

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血清驻留补体系统的激活开始级联反应,导致免疫细胞膜驻留补体受体的激活,从而协调血清和细胞免疫反应。虽然许多分子可以控制不适当的激活,但备解素是人类补体系统唯一已知的正向调节因子。通过稳定替代途径C3转换酶,它促进补体自身放大和持续激活,通过所有触发因素提高血清补体反应的幅度。我们已经确定了一类新的替代途径补体抑制剂家族,以下称为CirpA。功能和结构特征表明,CirpA家族直接与备解素结合,抑制其促进补体激活的能力,并以物种特有的方式导致对补体反应的有效抑制。本研究首次提供了备解素抑制剂的完整功能和结构特征,为未来的治疗方法开辟了道路。
Activation of the serum-resident complement system begins a cascade that leads to activation of membrane-resident complement receptors on immune cells, thus coordinating serum and cellular immune responses. Whilst many molecules act to control inappropriate activation, Properdin is the only known positive regulator of the human complement system. By stabilising the alternative pathway C3 convertase it promotes complement self-amplification and persistent activation boosting the magnitude of the serum complement response by all triggers.We have identified a novel family of alternative pathway complement inhibitors, hereafter termed CirpA. Functional and structural characterisation reveals that CirpA family directly bind to properdin, inhibiting its ability to promote complement activation, and leading to potent inhibition of the complement response in a species specific manner.For the first time this study provides a full functional and structural characterization of a properdin inhibitor, opening avenues for future therapeutic approaches.
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