Portal de Periódicos da CAPES

Effects of Glycosylation on the Properties and Functions of Influenza Virus Hemagglutinin

1997; Oxford University Press; Volume: 176; Issue: s1 Linguagem: Inglês

10.1086/514170

1537-6613

Irene T. Schulze,

Glycosylation and Glycoproteins Research

The influenza virus A hemagglutinin (HA) is a trimeric glycoprotein that contains 3–9 N-linked glycosylation sequons per subunit, depending on the strain. The location of these sites is determined by the nucleotide sequence of the HA gene, and, since the viral genome is replicated by an errorprone RNA polymerase, mutations, which add or remove glycosylation sites, occur at a high frequency. Mutations that are not lethal to the virus add to the structural diversity of the virus population. Factors that determine the glycosylation of the HA are reviewed herein, as are the effects of host-specific glycosylation on receptor binding, fusion activity, and antigenic properties of the virus. Effects of host-specific glycosylation and selection on virulence and on vaccine efficacy and surveillance are discussed. In addition, inadequacies in our understanding of HA glycosylation and its effects on host range are emphasized.