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viral matrix protein
Structural proteins linking the viral envelope with the virus core. They play a crucial role in virus assembly, and interact with the RNP complex as well as with the viral membrane. They are found in many enveloped viruses including paramyxoviruses, orthomyxoviruses,〔Battisti et al. Proc Natl Acad Sci U S A. 2012 Aug 28;109(35):13996-400.〕 herpesviruses, retroviruses, filoviruses and other groups.
An example is the M1 protein of the influenza virus, showing affinity to the glycoproteins inserted in the host cell membrane on one side and affinity for the RNP complex molecules on the other side, which allows formation at the membrane of a complex made of the viral ribonucleoprotein at the inner side indirectly connected to the viral glycoproteins protruding from the membrane. This assembly complex will now bud out of the cell as new mature viruses.
Viral matrix proteins, like many other viral proteins, can exert different functions during the course of the infection. For example, in Rhabdoviruses, binding of M proteins to nucleocapsids is accountable for the formation of its “bullet” shaped virions.
==References==
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