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Journal of Virology, February 1999, p. 1146-1155, Vol. 73, No. 2
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
The Surface Glycoproteins of H5 Influenza Viruses Isolated from
Humans, Chickens, and Wild Aquatic Birds Have Distinguishable
Properties
Mikhail
Matrosovich,1,2,*
Nannan
Zhou,1,3
Yoshihiro
Kawaoka,4 and
Robert
Webster1,5
Department of Virology and Molecular Biology,
St. Jude Children's Research Hospital, Memphis, Tennessee
381051;
M. P. Chumakov Institute of
Poliomyelitis and Viral Encephalitides, 142 782 Moscow,
Russia2;
Department of Microbiology,
Jiangxi Medical College, Nanchang 330006, China3;
Department of Pathobiological
Sciences, School of Veterinary Medicine, University of
Wisconsin
Madison, Madison, Wisconsin 537064;
and
Department of Pathology, University of Tennessee at
Memphis, Memphis, Tennessee 381635
Received 7 August 1998/Accepted 20 October 1998
In 1997, 18 confirmed cases of human influenza arising from
multiple independent transmissions of H5N1 viruses from infected chickens were reported from Hong Kong. To identify possible phenotypic changes in the hemagglutinin (HA) and neuraminidase (NA) of the H5
viruses during interspecies transfer, we compared the receptor-binding properties and NA activities of the human and chicken H5N1 isolates from Hong Kong and of H5N3 and H5N1 viruses from wild aquatic birds.
All H5N1 viruses, including the human isolate bound to Sia2-3Gal-containing receptors but not to Sia2-6Gal-containing receptors. This finding formally demonstrates for the first time that
receptor specificity of avian influenza viruses may not restrict initial avian-to-human transmission. The H5N1 chicken viruses differed
from H5 viruses of wild aquatic birds by a 19-amino-acid deletion in
the stalk of the NA and the presence of a carbohydrate at the globular
head of the HA. We found that a deletion in the NA decreased its
ability to release the virus from cells, whereas carbohydrate at the HA
head decreased the affinity of the virus for cell receptors. Comparison
of amino acid sequences from GenBank of the HAs and NAs from different
avian species revealed that additional glycosylation of the HA and a
shortened NA stalk are characteristic features of the H5 and H7 chicken
viruses. This finding indicates that changes in both HA and NA may be
required for the adaptation of influenza viruses from wild aquatic
birds to domestic chickens and raises the possibility that chickens may
be a possible intermediate host in zoonotic transmission.
*
Corresponding author. Mailing address: Department of
Virology and Molecular Biology, St. Jude Children's Research Hospital, 332 N. Lauderdale, Memphis, TN 38105. Phone: (901) 495-3412. Fax: (901)
523-2622. E-mail: Mikhail.Matrosovich{at}stjude.org.
Journal of Virology, February 1999, p. 1146-1155, Vol. 73, No. 2
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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