Biomaterial Database

[Innate immune response to RNA virus infection]. 2011

Hiroyuki Oshiumi, and Misako Matsumoto, and Tsukasa Seya

Graduate School of Medicine, Hokkaido University. oshiumi@med.hokudai.ac.jp

Viral RNA is recognized by RIG-I-like receptors and Toll-like receptors. RIG-I is a cytoplasmic viral RNA sensor. High Mobility Group Box (HMGB) proteins and DExD/H box RNA helicases, such as DDX3 and 60, associate with viral RNA. Those proteins promotes the RIG-I binding to viral RNA. RIG-I triggers the signal via IPS-1 adaptor molecule to induce type I IFN. RIG-I harbors Lys63-linked polyubiquitination by Riplet and TRIM25 ubiquitin ligases. The polyubiquitination is essential for RIG-I-mediated signaling. Toll-like receptors are located in endosome. TLR3 recognizes viral double-stranded RNA, and TLR7 and 8 recognize single-strand RNA. Virus has the ability to suppress these innate immune response. For example, to inhibit RIG-I-mediated signaling, HCV core protein suppresses the function of DDX3. In addition, HCV NS3-4A protein cleaves IPS-1 to inhibit the signal. Molecular mechanism of how viral RNA is recognized by innate immune system will make great progress on our understanding of how virus escapes from host immune system.

UI	MeSH Term	Description	Entries
D007113	Immunity, Innate	The capacity of a normal organism to remain unaffected by microorganisms and their toxins. It results from the presence of naturally occurring ANTI-INFECTIVE AGENTS, constitutional factors such as BODY TEMPERATURE and immediate acting immune cells such as NATURAL KILLER CELLS.	Immunity, Native,Immunity, Natural,Immunity, Non-Specific,Resistance, Natural,Innate Immune Response,Innate Immunity,Immune Response, Innate,Immune Responses, Innate,Immunity, Non Specific,Innate Immune Responses,Native Immunity,Natural Immunity,Natural Resistance,Non-Specific Immunity
D011971	Receptors, Immunologic	Cell surface molecules on cells of the immune system that specifically bind surface molecules or messenger molecules and trigger changes in the behavior of cells. Although these receptors were first identified in the immune system, many have important functions elsewhere.	Immunologic Receptors,Immunologic Receptor,Immunological Receptors,Receptor, Immunologic,Receptors, Immunological
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000071457	DEAD Box Protein 58	A DEAD-box RNA helicase that contains an N-terminal DEATH-LIKE DOMAIN, AAA+ ATPase domain, and C-terminal RNA HELICASE activity. It functions as an innate immune receptor through its recognition of viral nucleic acids. It also induces the expression of INTERFERON TYPE I and proinflammatory CYTOKINES. Its ligands include: 5'-triphosphorylated SINGLE-STRANDED RNA, DOUBLE-STRANDED RNA (dsRNA), and short dsRNA (less than 1 kb in length).	DEAD (Asp-Glu-Ala-Asp) Box Polypeptide 58,Probable ATP-Dependent RNA Helicase DDX58,RIG-I-like Receptor 1,Probable ATP Dependent RNA Helicase DDX58,RIG I like Receptor 1
D012327	RNA Virus Infections	Diseases caused by RNA VIRUSES.	Infections, RNA Virus,Infection, RNA Virus,RNA Virus Infection,Virus Infection, RNA,Virus Infections, RNA
D012367	RNA, Viral	Ribonucleic acid that makes up the genetic material of viruses.	Viral RNA
D016174	Hepacivirus	A genus of FLAVIVIRIDAE causing parenterally-transmitted HEPATITIS C which is associated with transfusions and drug abuse. Hepatitis C virus is the type species.	Hepatitis C virus,Hepatitis C-Like Viruses,Hepaciviruses,Hepatitis C Like Viruses,Hepatitis C viruses,Hepatitis C-Like Virus
D016207	Cytokines	Non-antibody proteins secreted by inflammatory leukocytes and some non-leukocytic cells, that act as intercellular mediators. They differ from classical hormones in that they are produced by a number of tissue or cell types rather than by specialized glands. They generally act locally in a paracrine or autocrine rather than endocrine manner.	Cytokine
D051193	Toll-Like Receptors	A family of pattern recognition receptors characterized by an extracellular leucine-rich domain and a cytoplasmic domain that share homology with the INTERLEUKIN 1 RECEPTOR and the DROSOPHILA toll protein. Following pathogen recognition, toll-like receptors recruit and activate a variety of SIGNAL TRANSDUCING ADAPTOR PROTEINS.	Receptors, Toll-Like,Toll-Like Receptor,Receptor, Toll-Like,Receptors, Toll Like,Toll Like Receptor,Toll Like Receptors
D053487	DEAD-box RNA Helicases	A large family of RNA helicases that share a common protein motif with the single letter amino acid sequence D-E-A-D (Asp-Glu-Ala-Asp). In addition to RNA helicase activity, members of the DEAD-box family participate in other aspects of RNA metabolism and regulation of RNA function.	DEAD-box RNA Helicase,DEAD Box Helicase p68,p68 DEAD Box Protein,p68 RNA Helicase,DEAD box RNA Helicase,DEAD box RNA Helicases,Helicase, DEAD-box RNA,Helicase, p68 RNA,Helicases, DEAD-box RNA,RNA Helicase, DEAD-box,RNA Helicase, p68,RNA Helicases, DEAD-box