11 results about "Env Glycoproteins" patented technology

The invention relates to a novel three-antigen HSV-2 subunit vaccine as well as a preparation method and application thereof, and belongs to the technical field of biology. The novel three-antigen HSV-2 subunit vaccine comprises antigens and a composite adjuvant, the antigens comprise HSV-2 gB2 envelope glycoprotein, HSV-2 gC2 envelope glycoprotein and HSV-2 gD2 envelope glycoprotein, and the composite adjuvant is CpG oligonucleotide and an aluminum adjuvant; the vaccine provided by the invention can induce a high-level neutralizing antibody, and widens targets for developing a novel multi-target antigen HSV-2 virus vaccine.

The invention provides a chimeric envelope glycoprotein, a preparation method thereof and an envelope plasmid, a packaging method and a kit of the chimeric envelope glycoprotein, and particularly relates to a preparation method of the chimeric envelope glycoprotein, the chimeric envelope glycoprotein and a lentivirus envelope plasmid. The invention discloses a pseudotyped packaging method of lentivirus and a kit. The amino acid sequence of the wild type VSV-G envelope glycoprotein is chimeric with the amino acid sequences of other envelope glycoproteins, and compared with the initial wild type envelope glycoprotein, the obtained chimeric envelope glycoprotein can effectively improve the lentivirus packaging efficiency, biological activity and other properties.

The invention belongs to the technical field of medical biology, and particularly relates to an EBV (Epstein-Barr Virus) neutralizing antibody-specifically-immune plasma high-throughput screening method and application thereof. EB virus envelope glycoprotein gp350 is selected as a screening target antigen, EBV specific plasma containing a high-titer EBV neutralizing antibody is rapidly screened in a high-throughput mode and used for preparing EBV specific human immune globulin, the titer of the EBV neutralizing antibody is obviously higher than that of listed intravenous gamma-C products, and the content of the EBV neutralizing antibody is about 4-8 times that of the EBV neutralizing antibody with the same concentration. The method provided by the invention can realize large-scale collection of EBV specific plasma through rapid high-throughput screening, reduces the workload of plasma screening, is suitable for large-scale production of EBV specific human immune globulin, and has a good application prospect.

The present invention provides a mutant vesicular stomatitis virus G glycoprotein (VSVG) and a targeting vector, relating to the area of ​​vector delivery. The present invention provides an envelope glycoprotein of vesicular stomatitis virus having a first mutation and a second mutation, wherein the first mutation prevents the envelope glycoprotein from mediating complement-mediated inactivation, and the second mutation reduces the envelope glycoprotein's ability to be recognized by a receptor. The present invention further provides a targeting vector comprising a first molecule that binds to an endocytosis receptor of a target cell, and a second molecule that promotes the release of a substance carried on the targeting vector into the cytoplasm rather than causing complement inactivation, wherein the second molecule promotes the occurrence of endosomal or lysosomal escape by the targeting vector and prevents the targeting vector from being inactivated by complement.

The invention belongs to the technical field of microbial immunity and DNA vaccines, and particularly relates to a preferred epitope peptide of a Crimean-Congo hemorrhagic fever virus envelope glycoprotein C terminal (CCHFV Gc), a tandem multi-epitope vaccine, an expression vector and application. The preferable epitope peptide is composed of any one amino acid sequence as shown in SEQ ID NO.1-SEQ ID NO.21, and the preferable epitope peptide has high affinity, strong immunogenicity and interspecific amp; and an intraspecific conservative preferred epitope. Preferably epitopes are connected in series through a linker to synthesize a series multi-epitope vaccine, the series multi-epitope vaccine enters cells to be expressed to form recombinant protein, then T lymphocytes are activated, and cellular immune response is induced. The in-vivo vaccine evaluation of animals is carried out by using the tandem multi-epitope vaccine, and it is proved that the vaccine can effectively induce anti-CCHFV specific cellular immune response and the application safety in BALB / c mice. The invention is helpful for understanding the immunobiology of CCHFV Gc and perfecting the epitope vaccine design for the virus in the future.

The present invention reveals MESD as a critical host dependency factor for Oropouche virus (OROV) infection. Initial identification was achieved through a CRISPR-Cas9 loss-of-function screen, which highlighted MESD amongst other potential factors. The ensuing research demonstrated that MESD knockout in HEK293T cells resulted in a significant reduction in OROV infection rates. Complementing MESDKO cells with FLAG-MESD re-established susceptibility, thus confirming MESD's essential role in the infection process. Interestingly, MESD specifically facilitates OROV infection without enhancing the infectivity of other viruses such as LACV, TOSCV, and WNV. The specificity of MESD for OROV was further validated by its interaction with OROV envelope glycoproteins, as shown through immunoprecipitation assays. These findings suggest that targeting MESD could be a novel and effective approach for diagnosing and treating OROV infections, potentially paving the way for innovative therapeutic strategies against this virus.

A Dengue virus Envelope Dimer Epitope (EDE) wherein the EDE: c) spans the polypeptides of a Dengue virus Envelope polypeptide dimer; and / or d) is presented on a dimer of Envelope proteins; and / or c) is formed from consecutive or nonconsecutive residues of the envelope polypeptide dimer, wherein the dimer is a homodimer or heterodimer of native and / or mutant envelope polypeptides, from any one or two of DENV-1, DENV-2, DENV-3 and DENV-4. The EDE may be a stabilized recombinant dengue virus envelope glycoprotein E ectodomain (sE) dimer, wherein the dimer is: covalently stabilized with at least one disulphide inter-chain bond between the two sE monomers, and / or covalently stabilized with at least one sulfhydrylreactive crosslinker between the two sE monomers, and / or covalently stabilized by linking the two sE monomers through modified sugars; and / or, covalently stabilised by being formed as a single polypeptide chain, optionally with a linker region, optionally a Glycine Serine rich linker region, separating the sE sequences, and / or non-covalently stabilized by substituting at least one amino acid residue in the amino acid sequence of at least one sE monomer with at least one bulky side chain amino acid, at the dimer interface or in domain 1 (D1) / domain 3 (D3) linker of each monomer. A compound, for example an antibody or antibody fragment that can neutralize more than one Dengue virus serotype, for example an antibody that can bind to an EDE of the invention.

This invention provides a method for efficient multi-gene editing and CAR site-directed integration based on BaEV envelope glycoprotein truncated viral particles and its application in immune cell engineering. The invention provides an MLV-VLP system utilizing BaEV envelope glycoprotein truncated particles to achieve efficient CRISPR-Cas9 delivery without electroporation or the use of randomly integrating viruses. Combined with adeno-associated virus (AAV6) delivery of HDR templates, it enables efficient site-directed integration of CAR sequences at target sites (such as TRAC, PD1, and B2M) in primary human T cells and NK cells. The prepared CAR-T or CAR-NK cells exhibit excellent cell killing, proliferation, and low exhaustion characteristics in vitro, achieving 100% tumor clearance in an in vivo mouse model. It can simultaneously achieve multi-gene knockout with high efficiency, supporting large-scale allogeneic CAR-T and CAR-NK cell production.

The invention provides a chimeric envelope glycoprotein, a preparation method thereof and an envelope plasmid, a packaging method and a kit of the chimeric envelope glycoprotein, and particularly relates to a preparation method of the chimeric envelope glycoprotein, the chimeric envelope glycoprotein and a lentivirus envelope plasmid. The invention discloses a pseudotyped packaging method of lentivirus and a kit. The amino acid sequence of the wild type VSV-G envelope glycoprotein is chimeric with the amino acid sequences of other envelope glycoproteins, and compared with the initial wild type envelope glycoprotein, the obtained chimeric envelope glycoprotein can effectively improve the lentivirus packaging efficiency, biological activity and other properties.

An object of the present invention is to provide an effective vaccine that can prevent and treat infection with CMV. A fusion protein of the present invention is a fusion protein of envelope glycoprotein B (gB protein) and a pentamer of the cytomegalovirus (CMV). A vaccine for prevent or treat infection with cytomegalovirus (CMV) of the present invention is a subunit vaccine containing a fusion protein of envelope glycoprotein B (gB protein) and a pentamer of CMV as an antigen.