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无膜细胞器和凝聚物协调先天免疫以抵抗病毒。

Membraneless Organelles and Condensates Orchestrate Innate Immunity Against Viruses.

机构信息

Laboratorio de Biología Celular del ARN, Instituto Leloir (FIL) and Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) - Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Buenos Aires, Argentina; Departamento de Fisiología y Biología Molecular y Celular (FBMyC), Facultad de Ciencias Exactas y Naturales (FCEN), Universidad de Buenos Aires, Buenos Aires, Argentina.

Laboratorio de Biología Celular del ARN, Instituto Leloir (FIL) and Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA) - Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Buenos Aires, Argentina. Electronic address: https://www.twitter.com/_gabithomas.

出版信息

J Mol Biol. 2023 Aug 15;435(16):167976. doi: 10.1016/j.jmb.2023.167976. Epub 2023 Jan 23.

Abstract

The cellular defense against viruses involves the assembly of oligomers, granules and membraneless organelles (MLOs) that govern the activation of several arms of the innate immune response. Upon interaction with specific pathogen-derived ligands, a number of pattern recognition receptors (PRRs) undergo phase-separation thus triggering downstream signaling pathways. Among other relevant condensates, inflammasomes, apoptosis-associated speck-like protein containing a caspase-recruitment domain (ASC) specks, cyclic GMP-AMP synthase (cGAS) foci, protein kinase R (PKR) clusters, ribonuclease L-induced bodies (RLBs), stress granules (SGs), processing bodies (PBs) and promyelocytic leukemia protein nuclear bodies (PML NBs) play different roles in the immune response. In turn, viruses have evolved diverse strategies to evade the host defense. Viral DNA or RNA, as well as viral proteases or proteins carrying intrinsically disordered regions may interfere with condensate formation and function in multiple ways. In this review we discuss current and hypothetical mechanisms of viral escape that involve the disassembly, repurposing, or inactivation of membraneless condensates that govern innate immunity. We summarize emerging interconnections between these diverse condensates that ultimately determine the cellular outcome.

摘要

细胞防御病毒涉及寡聚体、颗粒和无膜细胞器(MLO)的组装,这些结构控制着先天免疫反应的几个分支的激活。在与特定病原体衍生配体相互作用时,许多模式识别受体(PRRs)经历相分离,从而触发下游信号通路。在其他相关凝聚物中,炎性小体、含有半胱氨酸天冬氨酸蛋白酶募集结构域(ASC)斑点的凋亡相关斑点样蛋白、环鸟苷酸-腺苷酸合酶(cGAS)焦点、蛋白激酶 R(PKR)簇、核糖核酸酶 L 诱导体(RLBs)、应激颗粒(SGs)、处理体(PBs)和早幼粒细胞白血病蛋白核体(PML NBs)在免疫反应中发挥不同作用。反过来,病毒已经进化出多种逃避宿主防御的策略。病毒 DNA 或 RNA 以及病毒蛋白酶或携带固有无序区域的蛋白质可能通过多种方式干扰凝聚物的形成和功能。在这篇综述中,我们讨论了涉及控制先天免疫的无膜凝聚物的解组装、重新利用或失活的病毒逃逸的当前和假设机制。我们总结了这些不同凝聚物之间新兴的相互联系,这些联系最终决定了细胞的结果。

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