1887

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Volume 82, Issue 7

Cloning and identification of the infectious salmon anaemia virus haemagglutinin Free

Abstract

Infectious salmon anaemia virus (ISAV) is an orthomyxo-like virus that causes serious disease in Atlantic salmon (). 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.

  • Received:
  • Accepted:
  • Published Online:
© Microbiology Society
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2001-07-01
2024-04-18
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Cloning and identification of the infectious salmon anaemia virus haemagglutinin
J. Gen. Virol. 82, 1757 (2001); https://doi.org/10.1099/0022-1317-82-7-1757
/content/journal/jgv/10.1099/0022-1317-82-7-1757
/content/journal/jgv/10.1099/0022-1317-82-7-1757
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