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A large proportion of the Newcastle disease virus (NDV) matrix (M) protein is found in the nuclei of infected chicken embryo cells. Kinetic analysis indicated that much of the M protein enters the nucleus early in infection, concentrating in discrete regions of the nucleus and remaining there throughout infection. The M protein was found in localized regions of the nuclei of a variety of cell lines infected with NDV. Immunostaining for both M protein and nucleolar antigens indicated that most of these regions represent nucleoli. Moreover, this nucleolar localization of the M protein was observed in chicken embryo cells infected with 11 different strains of NDV. Only the M protein of strain HP displayed a modified pattern, concentrating in the nucleolus early in infection but in the cytoplasm late in infection. M protein transiently expressed in COS-1 cells also localized to the nucleus and nucleolus, indicating that the M protein does not require other NDV proteins for this localization.

journal of virology

Nuclear entry and nucleolar localization of the Newcastle disease virus (NDV) matrix protein occur early in infection and do not require other NDV proteins