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The matrix (M) protein plays an essential role in the assembly and budding of some enveloped RNA viruses. We expressed the human parainfluenza virus type 1 (hPIV-1) M and/or NP genes into 293T cells using the mammalian expression vector pCAGGS. Biochemical and electron microscopic analyses of transfected cells showed that the M protein alone can induce the budding of virus-like particles (vesicles) from the plasma membrane and that the NP protein can assemble into intracellular nucleocapsid-like (NC-like) structures. Furthermore, the coexpression of both the M and NP genes resulted in the production of vesicles enclosing NC-like structures, suggesting that the hPIV-1 M protein has the intrinsic ability to induce membrane vesiculation and to incorporate NC-like structures into these budding vesicles.

journal of virology

Human Parainfluenza Virus Type 1 Matrix and Nucleoprotein Genes Transiently Expressed in Mammalian Cells Induce the Release of Virus-Like Particles Containing Nucleocapsid-Like Structures