title: Receptor specificity of influenza viruses from birds and mammals: new data on involvement of the inner fragments of the carbohydrate chain.
abstract: We studied receptor-binding properties of influenza virus isolates from birds and mammals using polymeric conjugates of sialooligosaccharides terminated with common Neu5Ac alpha2-3Gal beta fragment but differing by the structure of the inner part of carbohydrate chain. Viruses isolated from distinct avian species differed by their recognition of the inner part of oligosaccharide receptor. Duck viruses displayed high affinity for receptors having beta1-3 rather than beta1-4 linkage between Neu5Ac alpha2-3Gal-disaccharide and penultimate N-acetylhexosamine residue. Fucose and sulfate substituents at this residue had negative and low effect, respectively, on saccharide binding to duck viruses. By contrast, gull viruses preferentially bound to receptors bearing fucose at N-acetylglucosamine residue, whereas chicken and mammalian viruses demonstrated increased affinity for oligosaccharides that harbored sulfo group at position 6 of (beta1-4)-linked GlcNAc. These data suggest that although all avian influenza viruses preferentially bind to Neu5Ac alpha2-3Gal-terminated receptors, the fine receptor specificity of the viruses varies depending on the avian species. Further studies are required to determine whether observed host-dependent differences in the receptor specificity of avian viruses can affect their ability to infect humans.
authors.affiliation: Chumakov Institute of Poliomyelitis and Viral Encephalitides, Russian Academy of Medical Sciences, Moscow, Russia.
authors.forename: Alexandra
authors.initials: A
authors.lastname: Gambaryan
authors.forename: Svetlana
authors.initials: S
authors.lastname: Yamnikova
authors.forename: Dmitryi
authors.initials: D
authors.lastname: Lvov
authors.forename: Alexander
authors.initials: A
authors.lastname: Tuzikov
authors.forename: Alexander
authors.initials: A
authors.lastname: Chinarev
authors.forename: Galina
authors.initials: G
authors.lastname: Pazynina
authors.forename: Robert
authors.initials: R
authors.lastname: Webster
authors.forename: Mikhail
authors.initials: M
authors.lastname: Matrosovich
authors.forename: Nicolai
authors.initials: N
authors.lastname: Bovin
mesh_terms: D000818:Animals; D001717:Birds; D002240:Carbohydrate Sequence; D002645:Chickens; D004372:Ducks; D006801:Humans; D009980:Influenza A virus / Q000378:metabolism* / Q000472:pathogenicity; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000737:chemistry / Q000378:metabolism*; D011991:Receptors, Virus / Q000737:chemistry / Q000378:metabolism*; D013045:Species Specificity; D013552:Swine
chemical_list: D009844:Oligosaccharides; D011991:Receptors, Virus; C016735:sialooligosaccharides