1887

Abstract

To understand the roles of human parainfluenza virus 3 (HPIV3) proteins in assembly and release, viral proteins were expressed individually and in combination in 293T cells. Expression of the matrix (M) protein triggered release of enveloped, matrix-containing virus-like particles (VLPs) from cells. When M was co-expressed with the nucleocapsid (N), fusion (F) or haemagglutinin-neuraminidase (HN) proteins, VLPs that contained M+N, M+F and M+HN, respectively, were generated, suggesting that M can independently interact with each protein to facilitate assembly and release. Additionally, expression of N protein enabled incorporation of the phosphoprotein (P) into VLPs, likely due to known N–P interactions. Finally, the HPIV3 C protein did not enhance VLP release, in contrast to observations with the related Sendai virus. These findings reinforce the central importance of the M protein in virus assembly and release, but also illustrate the variable roles of other paramyxovirus proteins during these processes.

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2016-06-15
2019-10-23
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