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J. Virol., Oct 1996, 6653-6657, Vol 70, No. 10
M Enami and K Enami
We have analyzed the mechanism by which the matrix (M1) protein associates
with cellular membranes during influenza A virus assembly. Interaction of
the M1 protein with the viral hemagglutinin (HA) or neuraminidase (NA)
glycoprotein was extensively analyzed by using wild- type and transfectant
influenza viruses as well as recombinant vaccinia viruses expressing the M1
protein, HA, or NA. Membrane binding of the M1 protein was significantly
stimulated at the late stage of virus infection. Using recombinant vaccinia
viruses, we found that a relatively small fraction (20 to 40%) of the
cytoplasmic M1 protein associated with cellular membranes in the absence of
other viral proteins, while coexpression of the HA and the NA stimulated
membrane binding of the M1 protein. The stimulatory effect of the NA
(>90%) was significant and higher than that of the HA (>60%).
Introduction of mutations into the cytoplasmic tail of the NA interfered
with its stimulatory effect. Meanwhile, the HA may complement the defective
NA and facilitate virus assembly in cells infected with the NA/TAIL(-)
transfectant. In conclusion, the highly conserved cytoplasmic tails of the
HA and NA play an important role in virus assembly.
Copyright © 1996, American Society for Microbiology
Influenza virus hemagglutinin and neuraminidase glycoproteins stimulate the membrane association of the matrix protein
Department of Biochemistry, Kanazawa University School of Medicine, Ishikawa, Japan.
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