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1 National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK
2 National Institute for Biological Standards and Control, South Mimms, Herts EN6 3QG, UK
The results of biochemical and immunoelectron microscopic studies provide evidence that the NB protein is an integral component of the influenza B virion. Its glycosylation and orientation in the membrane were shown to be equivalent to that of NB in the plasma membrane of virus-infected cells. Sensitivity to proteinase K showed that the N terminus is exterior to the virion and gold immunolabelling of freeze-fractured replicas showed that the C terminus is located in the interior of the virion. The similarities between NB of influenza B and M2 of influenza A viruses in structural features, their presence in the virion and possession of an ion channel activity suggest that, by analogy with the M2 protein, NB may also have a role in virus entry.
Present Address: Institute of Virology, Dubravska cesta 9, Bratislava 842 46, Slovakia.
Received 22 July 1996;
accepted 12 August 1996.
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