LGP2

Probable ATP-dependent RNA helicase DHX58 also known as RIG-I-like receptor 3 (RLR-3) or RIG-I-like receptor LGP2 (RLR) is a RIG-I-like receptor dsRNA helicase enzyme that in humans is encoded by the DHX58 gene.[5][6] The protein encoded by the gene DHX58 is known as LGP2 (Laboratory of Genetics and Physiology 2).[5][7][8]

DHX58
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 2RQA, 2W4R, 3EQT
Identifiers
Aliases	DHX58, D11LGP2, D11lgp2e, LGP2, RLR-3, DEXH-box helicase 58
External IDs	OMIM: 608588 MGI: 1931560 HomoloGene: 69371 GeneCards: DHX58
Gene location (Human) Chr. Chromosome 17 (human)[1] Band 17q21.2 Start 42,101,404 bp[1] End 42,112,714 bp[1]
Gene location (Mouse) Chr. Chromosome 11 (mouse)[2] Band 11 D|11 63.52 cM Start 100,694,884 bp[2] End 100,704,271 bp[2]
RNA expression pattern More reference expression data
Gene ontology Molecular function • DNA binding • nucleotide binding • GO:0008026 helicase activity • zinc ion binding • metal ion binding • GO:0001948 protein binding • single-stranded RNA binding • RNA binding • double-stranded RNA binding • hydrolase activity • ATP binding Cellular component • cytoplasm Biological process • negative regulation of MDA-5 signaling pathway • regulation of innate immune response • immune system process • response to virus • positive regulation of RIG-I signaling pathway • defense response to virus • negative regulation of innate immune response • negative regulation of type I interferon production • innate immune system • GO:0022415 viral process • positive regulation of MDA-5 signaling pathway • positive regulation of type I interferon production • negative regulation of RIG-I signaling pathway • response to bacterium Sources:Amigo / QuickGO
Orthologs
Species	Human	Mouse
Entrez	79132	80861
Ensembl	ENSG00000108771	ENSMUSG00000017830
UniProt	Q96C10	Q99J87
RefSeq (mRNA)	NM_024119	NM_030150
RefSeq (protein)	NP_077024	NP_084426
Location (UCSC)	Chr 17: 42.1 – 42.11 Mb	Chr 11: 100.69 – 100.7 Mb
PubMed search	[3]	[4]
Wikidata
View/Edit Human View/Edit Mouse

Structure and function

LGP2 was first identified and characterized in the context of mammary tissue in 2001,[5] but its function has been found to be more relevant to the field of innate antiviral immunity. LGP2 has been found to be essential for producing effective antiviral responses against many viruses that are recognized by RIG-I and MDA5.[9]

Since LGP2 lacks CARD domains, its effect on downstream antiviral signaling is likely due to interaction with dsRNA viral ligand or the other RLRs (RIG-I and MDA5).[10]

LGP2 has been shown to directly interact[10] with RIG-I through its C-terminal repressor domain (RD). The primary contact sites in this interaction is likely between the RD of LGP2 and the CARD or helicase domain of RIG-I as it is seen with RIG-I self-association,[10] but this has not been confirmed. The helicase activity of LGP2 has been found to be essential for its positive regulation of RIG-I signaling.[9] Overexpression of LGP2 is able to inhibit RIG-I-mediated antiviral signaling both in the presence and absence of viral ligands.[10][11][12] This inhibition of RIG-I signaling is not dependent upon the ability of LGP2 to bind viral ligands and is therefore not due to ligand competition.[7][13] Although LGP2 binds to dsRNA with higher affinity,[12] it is dispensable for RIG-I-mediated recognition of synthetic dsRNA ligands.[9] RIG-I, when overexpressed[7] and in LGP2 knock-down studies,[14] has been shown to induce antiviral response in the absence of viral ligand.

References

1. GRCh38: Ensembl release 89: ENSG00000108771 - Ensembl, May 2017
2. GRCm38: Ensembl release 89: ENSMUSG00000017830 - Ensembl, May 2017
3. "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
4. "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
5. Cui Y, Li M, Walton KD, Sun K, Hanover JA, Furth PA, Hennighausen L (Dec 2001). "The Stat3/5 locus encodes novel endoplasmic reticulum and helicase-like proteins that are preferentially expressed in normal and neoplastic mammary tissue". Genomics. 78 (3): 129–34. doi:10.1006/geno.2001.6661. PMID 11735219.
6. "Entrez Gene: LGP2 likely ortholog of mouse D11lgp2".
7. Childs K, Randall R, Goodbourn S (April 2012). "Paramyxovirus V proteins interact with the RNA Helicase LGP2 to inhibit RIG-I-dependent interferon induction". J. Virol. 86 (7): 3411–21. doi:10.1128/JVI.06405-11. PMC 3302505. PMID 22301134.
8. Matsumiya T, Stafforini DM (2010). "Function and regulation of retinoic acid-inducible gene-I". Crit. Rev. Immunol. 30 (6): 489–513. doi:10.1615/critrevimmunol.v30.i6.10. PMC 3099591. PMID 21175414.
9. 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.
10. Saito T, Hirai R, Loo YM, Owen D, Johnson CL, Sinha SC, Akira S, Fujita T, Gale M (January 2007). "Regulation of innate antiviral defenses through a shared repressor domain in RIG-I and LGP2". Proc. Natl. Acad. Sci. U.S.A. 104 (2): 582–7. doi:10.1073/pnas.0606699104. PMC 1766428. PMID 17190814.
11. Rothenfusser S, Goutagny N, DiPerna G, Gong M, Monks BG, Schoenemeyer A, Yamamoto M, Akira S, Fitzgerald KA (October 2005). "The RNA helicase Lgp2 inhibits TLR-independent sensing of viral replication by retinoic acid-inducible gene-I". J. Immunol. 175 (8): 5260–8. doi:10.4049/jimmunol.175.8.5260. PMID 16210631.
12. Yoneyama M, Kikuchi M, Matsumoto K, Imaizumi T, Miyagishi M, Taira K, Foy E, Loo YM, Gale M, Akira S, Yonehara S, Kato A, Fujita T (September 2005). "Shared and unique functions of the DExD/H-box helicases RIG-I, MDA5, and LGP2 in antiviral innate immunity". J. Immunol. 175 (5): 2851–8. doi:10.4049/jimmunol.175.5.2851. PMID 16116171.
13. Wang Y, Ludwig J, Schuberth C, Goldeck M, Schlee M, Li H, Juranek S, Sheng G, Micura R, Tuschl T, Hartmann G, Patel DJ (July 2010). "Structural and functional insights into 5'-ppp RNA pattern recognition by the innate immune receptor RIG-I". Nat. Struct. Mol. Biol. 17 (7): 781–7. doi:10.1038/nsmb.1863. PMC 3744876. PMID 20581823.
14. Burel SA, Machemer T, Ragone FL, Kato H, Cauntay P, Greenlee S, Salim A, Gaarde WA, Hung G, Peralta R, Freier SM, Henry SP (July 2012). "Unique O-Methoxyethyl Ribose-DNA Chimeric Oligonucleotide Induces an Atypical Melanoma Differentiation-Associated Gene 5-Dependent Induction of Type I Interferon Response". J. Pharmacol. Exp. Ther. 342 (1): 150–62. doi:10.1124/jpet.112.193789. PMID 22505629. S2CID 1899247.

Further reading

• Maruyama K, Sugano S (1994). "Oligo-capping: a simple method to replace the cap structure of eukaryotic mRNAs with oligoribonucleotides". Gene. 138 (1–2): 171–4. doi:10.1016/0378-1119(94)90802-8. PMID 8125298.
• Bonaldo MF, Lennon G, Soares MB (1997). "Normalization and subtraction: two approaches to facilitate gene discovery". Genome Res. 6 (9): 791–806. doi:10.1101/gr.6.9.791. PMID 8889548.
• Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, et al. (1997). "Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library". Gene. 200 (1–2): 149–56. doi:10.1016/S0378-1119(97)00411-3. PMID 9373149.
• Strausberg RL, Feingold EA, Grouse LH, et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. doi:10.1073/pnas.242603899. PMC 139241. PMID 12477932.
• Ota T, Suzuki Y, Nishikawa T, et al. (2004). "Complete sequencing and characterization of 21,243 full-length human cDNAs". Nat. Genet. 36 (1): 40–5. doi:10.1038/ng1285. PMID 14702039.
• Rual JF, Venkatesan K, Hao T, et al. (2005). "Towards a proteome-scale map of the human protein-protein interaction network". Nature. 437 (7062): 1173–8. doi:10.1038/nature04209. PMID 16189514. S2CID 4427026.
• Komuro A, Horvath CM (2007). "RNA- and virus-independent inhibition of antiviral signaling by RNA helicase LGP2". J. Virol. 80 (24): 12332–42. doi:10.1128/JVI.01325-06. PMC 1676302. PMID 17020950.