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. 1992 Oct;66(10):5815–5824. doi: 10.1128/jvi.66.10.5815-5824.1992

Nuclear retention of M1 protein in a temperature-sensitive mutant of influenza (A/WSN/33) virus does not affect nuclear export of viral ribonucleoproteins.

O Rey 1, D P Nayak 1
PMCID: PMC241457  PMID: 1527844

Abstract

We investigated the properties of ts51, an influenza virus (A/WSN/33) temperature-sensitive RNA segment 7 mutant. Nucleotide sequence analysis revealed that ts51 possesses a single nucleotide mutation, T-261----C, in RNA segment 7, resulting in a single amino acid change. Phenylalanine (position 79) in the wild-type M1 protein was substituted by serine in ts51. This mutation was phenotypically characterized by dramatic nuclear accumulation of the M1 protein and interfered with some steps at the late stage of virus replication, possibly affecting the assembly and/or budding of viral particles. However, although M1 protein was retained within the nucleus, export of the newly synthesized viral ribonucleoprotein containing the minus-strand RNA into the cytoplasm was essentially the same at both permissive and nonpermissive temperatures. The roles of M1 in the export of viral ribonucleoproteins from the nucleus into the cytoplasm and in the virus particle assembly process are discussed.

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