An influenza virus temperature-sensitive mutant defective in the nuclear-cytoplasmic transport of the negative-sense viral RNAs.
An influenza A virus mutant ts-51, which contains a temperature-sensitive (ts) defect in the genome encoding the M1 and M2 proteins, was characterized. Nucleotide sequencing of the M segment revealed a predicted single amino acid change of phenylalanine to serine at amino acid position 79 in the M1 protein. The nuclear-cytoplasmic transport of the negative-sense viral RNAs (vRNAs) was then investigated using an in situ hybridization technique. At 6 hr after the ts-51 virus infection, approximately 95% of the vRNAs were accumulated in the nucleus at a non-permissive temperature, when approximately 50% of the vRNAs were transported into the cytoplasm in the wild-type virus-infected cells. The M1 protein of the ts-51 virus was also accumulated in the nucleus under the same conditions. Therefore, the M1 protein of the ts-51 virus may be associated with the vRNPs, but the possible M1-vRNP complex thus formed was defective in the nuclear-cytoplasmic transport and the single amino acid change in the M1 protein was responsible for this defect.
Enami
K
K
Department of Biochemistry, Kanazawa University School of Medicine, Ishikawa, Japan.
Qiao
Y
Y
Fukuda
R
R
Enami
M
M
D001483:Base Sequence; D001692:Biological Transport; D002451:Cell Compartmentation; D002467:Cell Nucleus / Q000378:metabolism; D003593:Cytoplasm / Q000378:metabolism; D017403:In Situ Hybridization; D009980:Influenza A virus / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D009154:Mutation; D016372:RNA, Antisense / Q000302:isolation & purification / Q000378:metabolism*; D012367:RNA, Viral / Q000302:isolation & purification / Q000378:metabolism*; D014763:Viral Matrix Proteins / Q000378:metabolism; D000086082:Viroporin Proteins
D016372:RNA, Antisense; D012367:RNA, Viral; D014763:Viral Matrix Proteins; C031540:M-protein, influenza virus; C488936:M1 protein, Influenza A virus; C488937:M2 protein, Influenza A virus; D000086082:Viroporin Proteins