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The bacteriophage T4 DNA packaging machine consists of a molecular motor assembled at the portal vertex of an icosahedral head. The ATP-powered motor packages the 56-µm-long, 170-kb viral genome into 120 nm × 86 nm head to near crystalline density. We engineered this machine to deliver genes and proteins into mammalian cells. DNA molecules were translocated into emptied phage head and its outer surface was decorated with proteins fused to outer capsid proteins, highly antigenic outer capsid protein (Hoc) and small outer capsid protein (Soc). T4 nanoparticles carrying reporter genes, vaccine candidates, functional enzymes, and targeting ligands were efficiently delivered into cells or targeted to antigen-presenting dendritic cells, and the delivered genes were abundantly expressed in vitro and in vivo. Mice delivered with a single dose of F1-V plague vaccine containing both gene and protein in the T4 head elicited robust antibody and cellular immune responses. This "progene delivery" approach might lead to new types of vaccines and genetic therapies.

In vitro and in vivo delivery of genes and proteins using the bacteriophage T4 DNA packaging machine