PCBP2 maintains antiviral signaling homeostasis by regulating cGAS enzymatic activity via antagonizing its condensation.

PCBP2 maintains antiviral signaling homeostasis by regulating cGAS enzymatic activity via antagonizing its condensation.
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DOI:
10.1038/s41467-022-29266-9
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发表时间:
2022-03-23
影响因子:
16.6
通讯作者:
Sun Q
Sun Q
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Gu H;Yang J;Zhang J;Song Y;Zhang Y;Xu P;Zhu Y;Wang L;Zhang P;Li L;Chen D;Sun Q

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环鸟苷酸 - 腺苷酸合成酶(cGAS)在检测病原性DNA方面发挥着重要作用。它会生成环二核苷酸cGAMP,随后cGAMP与衔接蛋白STING结合,并进一步触发抗病毒天然免疫反应。然而,调控cGAS酶活性的分子机制在很大程度上仍不明确。在此,我们对与cGAS相互作用的蛋白聚胞苷酸结合蛋白2(PCBP2)进行了特性分析,该蛋白在控制cGAS酶活性方面发挥着重要作用,进而介导适当的cGAS - STING信号转导。我们发现,PCBP2过表达会降低cGAS - STING抗病毒信号,而PCBP2缺失则会显著增强cGAS活性。从机制上讲,我们证明PCBP2通过与cGAS特异性相互作用,而非与其他组件相互作用,对抗DNA病毒信号进行负调控。此外,PCBP2通过拮抗cGAS凝聚来降低cGAS酶活性,从而确保cGAMP的适量生成,并平衡cGAS - STING信号转导。总体而言,我们的研究结果为cGAS介导的抗病毒信号调控机制提供了新的见解。 cGAS感知病毒DNA并形成胞质cGAS - DNA颗粒,以介导抗DNA病毒信号通路。本文作者表明,PCBP2与cGAS相互作用并拮抗cGAS - DNA颗粒的凝聚,从而维持宿主免疫稳态。
Cyclic GMP-AMP synthase (cGAS) plays a major role in detecting pathogenic DNA. It produces cyclic dinucleotide cGAMP, which subsequently binds to the adaptor protein STING and further triggers antiviral innate immune responses. However, the molecular mechanisms regulating cGAS enzyme activity remain largely unknown. Here, we characterize the cGAS-interacting protein Poly(rC)-binding protein 2 (PCBP2), which plays an important role in controlling cGAS enzyme activity, thereby mediating appropriate cGAS-STING signaling transduction. We find that PCBP2 overexpression reduces cGAS-STING antiviral signaling, whereas loss of PCBP2 significantly increases cGAS activity. Mechanistically, we show that PCBP2 negatively regulates anti-DNA viral signaling by specifically interacting with cGAS but not other components. Moreover, PCBP2 decreases cGAS enzyme activity by antagonizing cGAS condensation, thus ensuring the appropriate production of cGAMP and balancing cGAS-STING signal transduction. Collectively, our findings provide insight into how the cGAS-mediated antiviral signaling is regulated. cGAS senses viral DNA and forms cytosolic cGAS-DNA granules to mediate anti-DNA viral signaling pathway. Here the authors show that PCBP2 interacts with cGAS and antagonizes condensation of cGAS-DNA granules, thus maintaining host immune homeostasis.
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发表时间: 2015-10-13
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