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. 1993 Dec;67(12):7436–7443. doi: 10.1128/jvi.67.12.7436-7443.1993

The hemagglutinins of duck and human H1 influenza viruses differ in sequence conservation and in glycosylation.

M D Inkster 1, V S Hinshaw 1, I T Schulze 1
PMCID: PMC238209  PMID: 8230464

Abstract

We determined the deduced amino acid sequences of two H1 duck influenza A virus hemagglutinins (HAs) and found that the consensus sequence of the HA, determined directly from virus recovered from the intestinal tract, remains unchanged through many generations of growth in MDCK cells and chicken embryos. These two duck viruses differ from each other by 5 amino acids and from A/Dk/Alberta/35/1976 (F. J. Austin, Y. Kawaoka, and R. G. Webster, J. Gen. Virol. 71:2471-2474, 1990) by 9 and 12 amino acids, most of which are in the HA1 subunit. They are antigenically similar to each other but different from the Alberta virus. We compared these H1 duck HAs with the HAs of human isolates to identify structural properties of this viral glycoprotein that are associated with host range. By comparison to the human H1 HAs, the duck virus HA sequences are highly conserved as judged by the small fraction of nucleotide differences between strains which result in amino acid substitutions. However, the most striking difference between these duck and human HAs is in the number and distribution of glycosylation sites. Whereas duck and swine viruses have four and five conserved glycosylation sites per HA1 subunit, none of which are on the tip of the HA, all human viruses have at least four additional sites, two or more of which are on the tip of the HA. These findings stress the role of glycosylation in the control of host range and suggest that oligosaccharides on the tip of the HA are important to the survival of H1 viruses in humans but not in ducks or swine.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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