RIG-I

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DEAD (Asp-Glu-Ala-Asp) box polypeptide 58
Protein DDX58 PDB 2QFB.png
Rendering based on PDB 2QFB.
Available structures
PDB Ortholog search: PDBe, RCSB
Identifiers
Symbols DDX58 ; RIG-I; RIGI; RLR-1
External IDs OMIM609631 MGI2442858 HomoloGene32215 GeneCards: DDX58 Gene
EC number 3.6.4.13
RNA expression pattern
PBB GE DDX58 218943 s at tn.png
More reference expression data
Orthologs
Species Human Mouse
Entrez 23586 230073
Ensembl ENSG00000107201 ENSMUSG00000040296
UniProt O95786 Q6Q899
RefSeq (mRNA) NM_014314 NM_172689
RefSeq (protein) NP_055129 NP_766277
Location (UCSC) Chr 9:
32.46 – 32.53 Mb
Chr 4:
40.2 – 40.24 Mb
PubMed search [1] [2]

RIG-I (retinoic acid-inducible gene 1) is a RIG-I-like receptor dsRNA helicase enzyme that is encoded (in humans) by the DDX58 gene. RIG-I is part of the RIG-I-like receptor family, which also includes MDA5 and LGP2, and functions as a pattern recognition receptor that is a sensor for viruses such as influenza A, Sendai virus, and flavivirus, however RIG-I provides no immunity to DNA viruses or retroviruses. RIG-I typically recognizes short (< 4000nt) 5′ triphosphate uncapped double stranded or single stranded RNA.[1][2][3] RIG-I and MDA5 are involved in activating MAVS and triggering an antiviral response.[4] RIG-I is also able to detect non-self 5′-triphosphorylated dsRNA transcribed from AT-rich dsDNA by DNA-dependent RNA polymerase III (Pol III). For many viruses, effective RIG-I-mediated antiviral responses are dependent on functionally active LGP2.[5]

Function[edit]

DEAD box proteins, characterized by the conserved motif Asp-Glu-Ala-Asp (DEAD), are putative RNA helicases which are implicated in a number of cellular processes involving RNA binding and alteration of RNA secondary structure. RIG-I contains a RNA helicase-DEAD box motifs and a caspase recruitment domain (CARD). RIG-I is involved in viral double-stranded (ds) RNA recognition and the regulation of immune response.[6]

References[edit]

  1. ^ . doi:10.1126/science.1132998.  Missing or empty |title= (help)
  2. ^ . doi:10.1038/ni1087.  Missing or empty |title= (help)
  3. ^ Kato H, Takeuchi O, Mikamo-Satoh E, Hirai R, Kawai T, Matsushita K, Hiiragi A, Dermody TS, Fujita T, Akira S. (Jul 2008). "Length-dependent recognition of double-stranded ribonucleic acids by retinoic acid-inducible gene-I and melanoma differentiation-associated gene 5.". J Exp Med. 205 (7): 1601–1610. doi:10.1084/jem.20080091. PMC 2442638. PMID 18591409. 
  4. ^ Hou, F; Sun, L, Zheng, H, Skaug, B, Jiang, QX, Chen, ZJ (Aug 5, 2011). "MAVS forms functional prion-like aggregates to activate and propagate antiviral innate immune response.". Cell 146 (3): 448–61. doi:10.1016/j.cell.2011.06.041. PMC 3179916. PMID 21782231. 
  5. ^ Satoh T, Kato H, Kumagai Y, Yoneyama M, Sato S, Matsushita K, Tsujimura T, Fujita T, Akira S, Takeuchi O (January 2010). "LGP2 is a positive regulator of RIG-I- and MDA5-mediated antiviral responses". Proc. Natl. Acad. Sci. U.S.A. 107 (4): 1512–7. doi:10.1073/pnas.0912986107. PMC 2824407. PMID 20080593. 
  6. ^ "Entrez Gene: DDX58 DEAD (Asp-Glu-Ala-Asp) box polypeptide 58". 


Further reading[edit]