title: Differential antiviral activity of Mx1, Mx2 and Mx3 proteins from gilthead seabream (Sparus aurata) against Infectious Pancreatic Necrosis Virus (IPNV).
abstract: Mx proteins are crucial effectors of the innate antiviral response mediated by the interferon type I signalling pathway. Recently, three Mx proteins, named SauMx1, SauMx2 and SauMx3, corresponding to three different genes, have been identified in the cultured marine species gilthead seabream (Sparus aurata). In this study, the three SauMx cDNAs were cloned into expression vectors and used for transfection of CHSE-214 cells. Monoclonal cell populations stably expressing each recombinant protein have been obtained and characterized. The protection conferred by each recombinant SauMx against Infectious Pancreatic Necrosis Virus (IPNV) infection has been in vitro evaluated, having found clear differences among them. According to the cytopathic effects and the virus yield reduction assays, only cells expressing SauMx2 and SauMx3 showed significant resistance to IPNV infection. Otherwise, quantitative RT real-time PCR assays suggested that each SauMx protein has a different target during the viral inhibition process. The differences observed among the three SauMx proteins are discussed in terms of their differential mechanism of action and antiviral specificity, suggesting, as a whole, to play a synergistic activity in the protection of gilthead seabream against IPNV.
authors.affiliation: Department of Genetics, University of Málaga, 29071 Málaga, Spain.
authors.forename: M A
authors.initials: MA
authors.lastname: Fernández-Trujillo
authors.forename: E
authors.initials: E
authors.lastname: García-Rosado
authors.forename: M C
authors.initials: MC
authors.lastname: Alonso
authors.forename: J J
authors.initials: JJ
authors.lastname: Borrego
authors.forename: M C
authors.initials: MC
authors.lastname: Alvarez
authors.forename: J
authors.initials: J
authors.lastname: Béjar
mesh_terms: D000818:Animals; D018175:Birnaviridae Infections / Q000276:immunology*; D005393:Fish Diseases / Q000276:immunology* / Q000821:virology; D029941:Fish Proteins / Q000276:immunology*; D005455:Fluorescent Antibody Technique; D019204:GTP-Binding Proteins / Q000276:immunology*; D018061:Infectious pancreatic necrosis virus / Q000276:immunology; D060888:Real-Time Polymerase Chain Reaction; D011994:Recombinant Proteins / Q000276:immunology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D021541:Sea Bream / Q000276:immunology*; D014162:Transfection
chemical_list: D029941:Fish Proteins; D011994:Recombinant Proteins; D019204:GTP-Binding Proteins