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. 2007 May;9(5):1203-14.
doi: 10.1111/j.1462-5822.2006.00860.x. Epub 2007 Jan 9.

Measles virus nucleocapsid transport to the plasma membrane requires stable expression and surface accumulation of the viral matrix protein

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Measles virus nucleocapsid transport to the plasma membrane requires stable expression and surface accumulation of the viral matrix protein

Nicole Runkler et al. Cell Microbiol. 2007 May.

Abstract

In measles virus (MV)-infected cells the matrix (M) protein plays a key role in virus assembly and budding processes at the plasma membrane because it mediates the contact between the viral surface glycoproteins and the nucleocapsids. By exchanging valine 101, a highly conserved residue among all paramyxoviral M proteins, we generated a recombinant MV (rMV) from cloned cDNA encoding for a M protein with an increased intracellular turnover. The mutant rMV was barely released from the infected cells. This assembly defect was not due to a defective M binding to other matrix- or nucleoproteins, but could rather be assigned to a reduced ability to associate with cellular membranes, and more importantly, to a defective accumulation at the plasma membrane which was accompanied by the deficient transport of nucleocapsids to the cell surface. Thus, we show for the first time that M stability and accumulation at intracellular membranes is a prerequisite for M and nucleocapsid co-transport to the plasma membrane and for subsequent virus assembly and budding processes.

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