Identification and functional analysis of interferon regulatory factor 3 in Lateolabrax maculatus. (October 2016)

• Record Type: Journal Article
• Authors: Chen, Xiao-Wu; Wei, Qun; Wang, Zhi-Peng; Wang, Chun-Lei; Bi, Yan-Hui; Gu, Yi-Feng
• Is Part Of: Developmental and comparative immunology. Volume 63(2016)
• Page Start: 1
• Page End: 9
• Publication Date: 2016-10
• Subjects: IRF3 (Interferon regulatory factor 3) -- ISRE (Interferon-stimulated response element) -- ISGs (IFN-stimulated genes) -- Lateolabrax maculatus; Immunology -- Periodicals; Developmental immunology -- Periodicals; 616.079
• DOI: 10.1016/j.dci.2016.05.005
• Languages: English
• ISSNs: 0145-305X

Abstract

Abstract: The interferon (IFN) regulatory factor 3 (IRF3) is a member of the IFN regulatory transcription factor family, which binds to the IFN-stimulated response element (ISRE) within the promoter of IFN genes and IFN-stimulated genes. In this study, the IRF3 cDNA of sea perch Lateolabrax maculatus (SpIRF3) was identified, which contained 1781 bp with an open reading frame of 1398 bp that coded a 465 amino acid protein. The SpIRF3 protein shared conserved characterizations with its homologues and displayed the conserved DNA-binding domain, IRF association domain, serine-rich C-terminal domain, and tryptophan residue cluster. Phylogenetic analysis illustrated that SpIRF3 belonged to the IRF3 subfamily. Subcellular localization analysis showed that SpIRF3 mainly resided in the cytoplasm without stimuli but translocated into nuclei in the presence of poly I:C. Real-time PCR data indicated that SpIRF3 was transcriptionally up-regulated by poly I:C stimulation in various organs. Moreover, reporter assay revealed that SpIRF3 functioned as a modulator in triggering the IFN response by inducing the activity of IFN and ISRE-containing promoter. These data revealed that SpIRF3 was a potential molecule in the IFN immune defense system against viral infection. Highlights: Sea perch IRF3 is characterized with typical functional domains and protein structure. Sea perch IRF3 triggers activation of IFN- and ISRE-promoter. This study suggests evolutionary conservation of IFN signaling pathway among vertebrates.