title: Cloning and identification of the infectious salmon anaemia virus haemagglutinin.
abstract: Infectious salmon anaemia virus (ISAV) is an orthomyxo-like virus that causes serious disease in Atlantic salmon (Salmo salar). Like the orthomyxoviruses, ISAV has been shown to possess haemagglutinin (HA) activity. This study presents the cloning, expression and identification of the ISAV HA gene, which was isolated from a cDNA library by immunoscreening. The HA gene contained an ISAV-specific conserved nucleotide motif in the 5' region and a 1167 bp open reading frame encoding a protein with a predicted molecular mass of 42.4 kDa. The HA gene was expressed in a baculovirus system. A monoclonal antibody (MAb) shown previously to be directed against the ISAV HA reacted with insect cells infected with recombinant baculovirus. Salmon erythrocytes also adsorbed to these cells and adsorption was inhibited by the addition of either the ISAV-specific MAb or a polyclonal rabbit serum prepared against purified virus, confirming the virus specificity of the reaction. Immunoblot analyses indicated that ISAV HA, in contrast to influenza virus HA, is not posttranslationally cleaved. Sequence comparisons of the HA gene from five Norwegian, one Scottish and one Canadian isolate revealed a highly polymorphic region that may be useful in epidemiological studies.
authors: Department of Fisheries and Marine Biology, University of Bergen, Norway2.|Intervet Norbio, Thormøhlensgate 58, N-5008 Bergen, Norway1.
authors: Bjørn
authors: B
authors: Krossøy
authors: Department of Fisheries and Marine Biology, University of Bergen, Norway2.
authors: Magnus
authors: M
authors: Devold
authors: Intervet International BV, Wim de Körverstraat 35, 5831 Boxmeer, The Netherlands3.
authors: Lisette
authors: L
authors: Sanders
authors: Department of Medical Genetics, Haukeland Hospital, Bergen, Norway4.
authors: Per Morten
authors: PM
authors: Knappskog
authors: National Veterinary Institute, Oslo, Norway5.
authors: Vidar
authors: V
authors: Aspehaug
authors: National Veterinary Institute, Oslo, Norway5.
authors: Knut
authors: K
authors: Falk
authors: Department of Fisheries and Marine Biology, University of Bergen, Norway2.
authors: Are
authors: A
authors: Nylund
authors: Intervet International BV, Wim de Körverstraat 35, 5831 Boxmeer, The Netherlands3.
authors: Sjo
authors: S
authors: Koumans
authors: Department of Fisheries and Marine Biology, University of Bergen, Norway2.
authors: Curt
authors: C
authors: Endresen
authors: Intervet Norbio, Thormøhlensgate 58, N-5008 Bergen, Norway1.
authors: Eirik
authors: E
authors: Biering
mesh_terms: D000595:Amino Acid Sequence; D000740:Anemia / Q000662:veterinary*; D000818:Animals; D002460:Cell Line; D003001:Cloning, Molecular; D005393:Fish Diseases / Q000821:virology*; D005399:Fishes; D005455:Fluorescent Antibody Technique; D005814:Genes, Viral; D006389:Hemagglutinins, Viral / Q000096:biosynthesis / Q000235:genetics*; D008969:Molecular Sequence Data; D009975:Orthomyxoviridae / Q000235:genetics* / Q000276:immunology; D009976:Orthomyxoviridae Infections / Q000662:veterinary*; D011994:Recombinant Proteins / Q000096:biosynthesis; D020317:Salmo salar; D016415:Sequence Alignment
chemical_list: D006389:Hemagglutinins, Viral; D011994:Recombinant Proteins