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. 1993 Feb;67(2):759–764. doi: 10.1128/jvi.67.2.759-764.1993

Biologic importance of neuraminidase stalk length in influenza A virus.

M R Castrucci 1, Y Kawaoka 1
PMCID: PMC237428  PMID: 8419645

Abstract

To investigate the biologic importance of the neuraminidase (NA) stalk of influenza A virus, we generated mutant viruses of A/WSN/33 (H1N1) with stalks of various lengths (0 to 52 amino acids), by using the recently developed reverse genetics system. These mutant viruses, including one that lacked the entire stalk, replicated in tissue culture to the level of the parent virus, whose NA stalk contains 24 amino acid residues. In eggs, however, the length of the stalk was correlated with the efficiency of virus replication: the longer the stalk, the better the replication. This finding indicates that the length of the NA stalk affects the host range of influenza A viruses. The NA stalkless mutant was highly attenuated in mice; none of the animals died even after intranasal inoculation of 10(6) PFU of the virus (the dose of the parent virus required to kill 50% of mice was 10(2.5) PFU). Moreover, the stalkless mutant replicated only in the respiratory organs, whereas the parent virus caused systemic infection in mice. Thus, attenuation of the virus with the deletion of the entire NA stalk raises the possibility of its use as live vaccines.

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Selected References

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