VLP (Virus-Like Particle) Builder Kit

The VLP Builder Kit provides a streamlined solution for generating safe, biologically inert virus-like particles (VLPs). This system is optimized for expressing and displaying complex mammalian cell surface proteins-such as Tumor-Associated Antigens (TAAs) and G-protein coupled receptors (GPCRs)-in a convenient, water-soluble format. By leveraging the behavior of the lentiviral Gag protein, the kit facilitates the budding of particles from the lipid raft microdomains of Freestyle(TM) 293 cells. As these particles are secreted, they capture regions of the host plasma membrane, ensuring that membrane proteins are presented in their authentic cellular context and native conformation. This kit contains materials sufficient to purify mammalian cell cultures at a cell density of 1 x 106 cells/ml. Figure 1. VLP expression and purification schematic. Virus-like Particles (VLPs) are non-infectious, genome-free structures that provide a safer and more efficient alternative to traditional protein isolation methods. By expressing the HIV-1 Gag protein in cell lines including FreestyleTM 293 cells, this system leverages Gag's natural affinity for lipid raft microdomains-specialized membrane regions that regulate protein conformation and quality control. As these particles bud and secrete from the host cells, they selectively capture and envelop segments of the plasma membrane rich in native and recombinant proteins. This process preserves the target proteins in their authentic cellular context and orientation. Because VLPs are naturally released into the culture medium, researchers can harvest highly concentrated, receptor-rich preparations directly from the supernatant. This streamlined workflow eliminates the need for complex cell fractionation and detergent-based extraction, significantly reducing contaminants from internal organelles like the ER or Golgi.