Control of antiviral innate immune response by protein geranylgeranylation
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<jats:p>The mitochondrial antiviral signaling protein (MAVS) orchestrates host antiviral innate immune response to RNA virus infection. However, how MAVS signaling is controlled to eradicate virus while preventing self-destructive inflammation remains obscure. Here, we show that protein geranylgeranylation, a posttranslational lipid modification of proteins, limits MAVS-mediated immune signaling by targeting Rho family small guanosine triphosphatase Rac1 into the mitochondria-associated endoplasmic reticulum (ER) membranes (MAMs) at the mitochondria-ER junction. Protein geranylgeranylation and subsequent palmitoylation promote Rac1 translocation into MAMs upon viral infection. MAM-localized Rac1 limits MAVS’ interaction with E3 ligase Trim31 and hence inhibits MAVS ubiquitination, aggregation, and activation. Rac1 also facilitates the recruitment of caspase-8 and cFLIP<jats:sub>L</jats:sub> to the MAVS signalosome and the subsequent cleavage of Ripk1 that terminates MAVS signaling. Consistently, mice with myeloid deficiency of protein geranylgeranylation showed improved survival upon influenza A virus infection. Our work revealed a critical role of protein geranylgeranylation in regulating antiviral innate immune response.</jats:p>
Published Version (Please cite this version)10.1126/sciadv.aav7999
Publication InfoYang, Shigao; Harding, Alfred T; Sweeney, Catherine; Miao, David; Swan, Gregory; Zhou, Connie; ... Wang, Donghai (2019). Control of antiviral innate immune response by protein geranylgeranylation. Science Advances, 5(5). pp. eaav7999-eaav7999. 10.1126/sciadv.aav7999. Retrieved from https://hdl.handle.net/10161/18596.
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Assistant Professor of Immunology
The study of microbial communities that reside on and within the human body (the microbiome) is considered one of the hottest areas of science today. It is now well appreciated that the microbiome has remarkable influence on diverse aspects of human health and disease. To understand how the microbiome exerts such influence, our lab seeks to define the mechanisms by which cells of the immune system interact with microbes that reside in the intestine. To the immune system, co-existence with mic
Assistant Professor of Molecular Genetics and Microbiology
Professor of Medicine
My research interests focus on studying the role of nitric oxide and related enzymes in the pathogenesis of lung disease, specifically that caused by nitrosative/oxidative stress. Proposed studies are performed in cell culture and applied to animal models of disease, then examined in human disease where relevant. It is our hope that by better understanding the role of NO and reactive nitrogen species in mediating inflammation, and regulating cell signaling, that we will not only help to unr
Research Assistant, Ph D Student
Program Start Year: 2015Donghai Wang LaboratoryCholesterol Homeostasis in Immunity and Human Disease
Assistant Professor in Medicine
Inflammation underlies a variety of human diseases such as obesity, diabetes, cardiovascular diseases, neurodegenerative diseases, arthritis and cancer. Together, these diseases constitute a major challenge to the well being of modern human society. Understanding the fundamental mechanisms of inflammation may provide rationales for designing novel interventions to treat these maladies. Autoinflammatory diseases are an emerging family of illness, characterized by dysregulation of innate immune re
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