What is Virus-Like Particles (VLP)?

A viral envelope is the outermost layer of the virus, consist of the glycoproteins. It serves to bind the receptor on the host’s cell membrane. When desired, the virus can be enveloped with a desired protein (so called pseudo-typing). The glycoproteins that able to maintain a viral particle structure, can be used as that virus’s envelope proteins. Please be noted, not all proteins can serve as envelope protein for a given virus type.

Gentarget’s Lentivirus-Like Particles (VLP):

Gentarget developed the Virus-like Particle products as the different pseudo-typed lentiviral particles. They are pseudo-typed with a desired envelope protein at its surface. It is packaged with a non-sense “Null-sequence” as virion core. Such VLPs are non-replicative, non-pathogenic and non-infectious to mammalian cells (unless the cells express the corresponding receptor to the pseudo-typed envelope protein). The lentiviral-like-particles are used to present the surface enriched envelope protein.

Why use VLP?

1) Effective presentation of a specific viral antigen or Mimic viral Structure:

Lenti-Virus-Like Particles (VLP) are more representative of how a specific virus antigen in vivo, mimic native exposed epitopes. The specific virus antigen is presented as the VLP’s surface envelope at high density, and easier access to immune response. They are highly immunogenic and more effectively activate the immune response. Therefore, the most effective antibodies can be raised from the VLP.

The VLP can are often used as the representative antigens or immunogen, for antibody development and validation, or for R&D immunoassays, vaccine research.

The VLPs are premade with high density of surface envelope protein, ready to use, no need to purify the envelope antigen. You simply coat the VLP as antigen, onto wells in ELISA plate, for its antibody / vaccine detection or validation. (Immunization and antibody Screening by ELISA)

2) Vaccine research:

VLP can be used as in platform for high through-put research in vaccine candidates. The customized VLPs resemble viruses with a specific coat protein, presented in higher density per particles with 3-dimensional conformation, such as VLPs for HBV, HPV, CA16, EV71 poliovirus, SARS-CoV virus, Zika virus, Ebola virus, and much more.

References:

1. Production of virus-like particles for vaccines;
2. Construction of SARS-CoV-2 Virus-Like Particles by Mammalian Expression System;

Please see each VLP product details below.