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. 1995 Mar;69(3):1964–1970. doi: 10.1128/jvi.69.3.1964-1970.1995

Nucleus-targeting domain of the matrix protein (M1) of influenza virus.

Z Ye 1, D Robinson 1, R R Wagner 1
PMCID: PMC188818  PMID: 7853543

Abstract

The matrix protein M1 of influenza virus A/WSN/33 was shown by immunofluorescent staining to be transported into the nuclei of transfected cells without requiring other viral proteins. We postulated the existence of a potential signal sequence at amino acids 101 to 105 (RKLKR) that is required for nuclear localization of the M1 protein. When CV1 cells were transfected with recombinant vectors expressing the entire M1 protein (amino acids 1 to 252) or just the first 112 N-terminal amino acids, both the complete M1 protein and the truncated M1 protein were transported to the nucleus. In contrast, expression in CV1 cells of vectors coding for M1 proteins with deletions from amino acids 77 to 202 or amino acids 1 to 134 resulted only in cytoplasmic immunofluorescent staining of these truncated M1 proteins without protein being transported to the nucleus. Moreover, no nuclear membrane translocation occurred when CV1 cells were transfected with recombinant vectors expressing M1 proteins with deletions of amino acids 101 to 105 or with substitution at amino acids 101 to 105 of SNLNS for RKLKR. Furthermore, a synthetic oligopeptide corresponding to M1 protein amino acids 90 to 108 was also transported into isolated nuclei derived from CV1 cells, whereas oligopeptides corresponding to amino acid sequences 25 to 40, 67 to 81, and 135 to 164 were not transported into the isolated cell nuclei. These data suggest that the amino acid sequence 101RKLKR105 is the nuclear localization signal of the M1 protein.

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Selected References

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