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Journal of Virology, July 2000, p. 6015-6020, Vol. 74, No. 13
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Balanced Hemagglutinin and Neuraminidase Activities Are Critical
for Efficient Replication of Influenza A Virus
Lyndon J.
Mitnaul,1,
Mikhail
N.
Matrosovich,1,2
Maria R.
Castrucci,3
Alexander B.
Tuzikov,4
Nikolai V.
Bovin,4
Darwyn
Kobasa,1 and
Yoshihiro
Kawaoka5,6,*
Department of Virology and Molecular Biology, St. Jude
Children's Research Hospital, Memphis, Tennessee
381011; M. P. Chumakov
Institute of Poliomyelitis and Viral Encephalitides, Russian Academy of
Medical Sciences, 142782 Moscow,2 and
Shemyakin Institute of Bioorganic Chemistry, Miklukho-Maklaya,
117871 Moscow,4 Russia; Dipartimento
di Virologia, Istituto Superiore di Sanita, 00161 Rome,
Italy3; Department of
Pathobiological Sciences, School of Veterinary Medicine, University of
Wisconsin
Madison, Madison, Wisconsin
537065; and Institute of Medical
Science, University of Tokyo, Minato-ku, Tokyo 108-8639, Japan6
Received 13 December 1999/Accepted 6 April 2000
The SD0 mutant of influenza virus A/WSN/33 (WSN), characterized by
a 24-amino-acid deletion in the neuraminidase (NA) stalk, does not grow
in embryonated chicken eggs because of defective NA function.
Continuous passage of SD0 in eggs yielded 10 independent clones that
replicated efficiently. Characterization of these egg-adapted viruses
showed that five of the viruses contained insertions in the NA gene
from the PB1, PB2, or NP gene, in the region linking the transmembrane
and catalytic head domains, demonstrating that recombination of
influenza viral RNA segments occurs relatively frequently. The other
five viruses did not contain insertions in this region but displayed
decreased binding affinity toward sialylglycoconjugates, compared with
the binding properties of the parental virus. Sequence analysis of one
of the latter viruses revealed mutations in the hemagglutinin (HA)
gene, at sites in close proximity to the sialic acid receptor-binding
pocket. These mutations appear to compensate for reduced NA function
due to stalk deletions. Thus, balanced HA-NA functions are necessary for efficient influenza virus replication.
*
Corresponding author. Mailing address: Department of
Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin
Madison, 2015 Linden Dr. West, Madison, WI 53706. Phone: (608) 265-4925. Fax: (608) 265-5622. E-mail:
kawaokay{at}svm.vetmed.wisc.edu.

Present address: Department of Immunology and Rheumatology, Merck
Research Laboratories, Rahway, NJ
07065.
Journal of Virology, July 2000, p. 6015-6020, Vol. 74, No. 13
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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