Nucleic acid binding by Mason-Pfizer monkey virus CA promotes virus assembly and genome packaging Journal Article

Author(s): Füzik, Tibor; Píchalová, Růžena; Schur, Florian; Strohalmová, Karolína; Křížová, Ivana; Hadravová, Romana; Rumlová, Michaela; Briggs, John A; Ulbrich, Pavel; Ruml, Tomáš
Article Title: Nucleic acid binding by Mason-Pfizer monkey virus CA promotes virus assembly and genome packaging
Abstract: The Gag polyprotein of retroviruses drives immature virus assembly by forming hexameric protein lattices. The assembly is primarily mediated by protein-protein interactions between capsid (CA) domains and by interactions between nucleocapsid (NC) domains and RNA. Specific interactions between NC and the viral RNA are required for genome packaging. Previously reported cryoelectron microscopy analysis of immature Mason-Pfizer monkey virus (M-PMV) particles suggested that a basic region (residues RKK) in CA may serve as an additional binding site for nucleic acids. Here, we have introduced mutations into the RKK region in both bacterial and proviral M-PMV vectors and have assessed their impact on M-PMV assembly, structure, RNA binding, budding/release, nuclear trafficking, and infectivity using in vitro and in vivo systems. Our data indicate that the RKK region binds and structures nucleic acid that serves to promote virus particle assembly in the cytoplasm. Moreover, the RKK region appears to be important for recruitment of viral genomic RNA into Gag particles, and this function could be linked to changes in nuclear trafficking. Together these observations suggest that in M-PMV, direct interactions between CA and nucleic acid play important functions in the late stages of the viral life cycle.
Journal Title: Journal of Virology
Volume: 90
Issue 9
ISSN: 1098-5514
Publisher: ASM  
Date Published: 2016-05-01
Start Page: 4593
End Page: 4603
DOI: 10.1128/JVI.03197-15
Notes: Work in the laboratory of John A. G. Briggs was funded by Deutsche Forschungsgemeinschaft (DFG) (BR 3635/2-1). This work, including the efforts of Tomas Ruml, was funded by the Grant Agency of the Czech Republic (14-15326S) and the Czech Ministry of Education (NPU I sus- tainability projects LO1302 and LO1304).
Open access: no