32 results about "Serotype a" patented technology

Modified polypeptides based on the botulinum neurotoxin A heavy chain containing the double mutation Trp-Tyr->Leu-Ser in the ganglioside binding motif Ser-X-Trp-Tyr do not bind polysialogangliosides and nerve endings. The polypeptides are useful in the preparation of nontoxic vaccines against the effects of C. botulinum infection. The modified polypeptides are also useful as vehicles for the transepithelial delivery of diagnostic and therapeutic entities, through formation of conjugates between the polypeptides and the diagnostic or therapeutic entities.

Botulinum neurotoxins, the most potent of all toxins, induce lethal neuromuscular paralysis by inhibiting exocytosis at the neuromuscular junction. The light chains (LC) of these dichain neurotoxins are a new class of zinc-endopeptidases that specifically cleave the synaptosomal proteins, SNAP-25, VAMP, or syntaxin at discrete sites. The present invention relates to the construction, expression, purification, and use of synthetic or recombinant botulinum neutoroxin genes. For example, a synthetic gene for the LC of the botulinum neurotoxin serotype A (BoNT / A) was constructed and overexpressed in Escherichia coli. The gene product was purified from inclusion bodies. The methods of the invention can provide 1.1 g of the LC per liter of culture. The LC product was stable in solution at 4° C. for at least 6 months. This rBoNT / A LC was proteolytically active, specifically cleaving the Glu-Arg bond in a 17-residue synthetic peptide of SNAP-25, the reported cleavage site of BoNT / A. Its calculated catalytic efficiency kcat / Km was higher than that reported for the native BoNT / A dichain. Treating the rBoNT / A LC with mercuric compounds completely abolished its activity, most probably by modifying the cysteine-164 residue located in the vicinity of the active site. About 70% activity of the LC was restored by adding Zn2+ to a Zn2+-free, apo-LC preparation. The LC was nontoxic to mice and failed to elicit neutralizing epitope(s) when the animals were vaccinated with this protein. In addition, injecting rBoNT / A LC into sea urchin eggs inhibited exocytosis-dependent plasma membrane resealing.

The present invention provides clostridial toxin substrates useful in assaying for the protease activity of any clostridial toxin, including botulinum toxins of all serotypes as well as tetanus toxins. A clostridial toxin substrate of the invention contains a donor fluorophore; an acceptor having an absorbance spectrum overlapping the emission spectrum of the donor fluorophore; and a clostridial toxin recognition sequence that includes a cleavage site, where the cleavage site intervenes between the donor fluorophore and the acceptor and where, under the appropriate conditions, resonance energy transfer is exhibited between the donor fluorophore and the acceptor.

The present invention provides a novel isolated plasmid, wherein the plasmid is a native plasmid found in unique C. botulinum type A strains and encode either BoNT / A3 or BoNT / A4 and BoNT / B. The present invention also provides a method of obtaining a plasmid-encoded botulinum neurotoxin and botulinum neurotoxin complex comprising the step of isolating a plasmid encoding the cntA / A or cntA / B neurotoxin gene and genes encoding protein components of the toxin complex from a C. botulinum type A strain. The inventors performed comparative analyzes of representative BoNT / A subtype strains by pulsed-field gel electrophoresis (PFGE) and Southern hybridizations with probes specific for the BoNT / A and B genes, cntA / A and cntA / B. Unexpectedly, the inventors determined that the genes encoding BoNT / A3 in the A3 strain, and BoNT / A4 and BoNT / B in the A4 strain, are on plasmids.

The invention discloses an anti-Mycoplasma bovis and Pasteurella fusion protein Md-UF1-Md-AP2 and a gene encoding the fusion protein. It induces housefly larvae with Mycoplasma pneumoniae and constructs an inhibitory subtractive library. In the inhibitory subtractive library The Md-UF1 gene screened out in the chicken-derived Salmonella housefly larvae was used to construct a suppressive subtractive library, and the Md-AP2 gene screened out in the suppressive subtractive library was constructed using the overlap extension and shearing technique. The fusion gene Md-UF1-Md-AP2, the expressed anti-Mycoplasma bovis and Pasteurella fusion protein Md-UF1-Md-AP2, has inhibitory effects on Pasteurella multocida type A and Mycoplasma bovis, The problem of drug resistance of Pasteurella bovis and Mycoplasma bovis has been solved. When the cattle have pneumonia symptoms, early medication can prevent and treat at the same time.

A method to produce a chimeric protein having a flavivirus backbone and portions dengue virus is provided. The flavivirus envelope protein, such as from yellow fever virus 17D vaccine strain, is modified replacing amino acids surrounding the fusion loop of the flavivirus backbone with corresponding amino acids from the dengue virus envelope protein. The chimeric protein is useful as a vaccine to stimulate an immune response against DENV infection, thereby producing broadly neutralizing (protective) antibodies against dengue virus and reduce the induction of non-neutralizing antibodies that will cause enhancement.

The invention relates to the field of immunology, and particularly discloses a poultry ornithobacterium rhinotracheale vaccine. The vaccine is prepared by taking isolated strains of two main epidemicserotypes of ornithobacterium rhinotracheale as antigens, culturing with a blood bouillon culture-medium, then inactivating by formaldehyde, mixing the antigens of the two serotypes at a ratio of 1 to1, then adding poloxamer with volume being 1 to 5 percent of that of the liquid antigens and beta glucan with volume being 1 to 4 percent of that of the liquid antigens to prepare a water phase, finally emusifying according to a ratio of the water phase to an oil phase being 4 to 6. The vaccine provided by the invention can be used for preventing symptoms such as respiratory diseases caused by currently epidemic poultry ornithobacterium rhinotracheale, slow growth and egg-laying decrease.

This invention relates to novel recombinant botulinum neurotoxins serotype A exhibiting both (i) an increased duration of effect and (ii) a high specific biological activity. These novel recombinant botulinum neurotoxins comprise at least two additional domains consisting of proline, alanine and an additional amino acid residue and at least one amino acid modification which is located at the alpha-exosite or at the beta-exosite of the light chain of the neurotoxin. The invention further relates to novel recombinant single-chain precursor botulinum neurotoxins and compositions comprising the recombinant botulinum neurotoxin with an increased duration of effect and a high specific biological activity.

The application provides stable peptide-based Botulinum neurotoxin (BoNT) serotype A capture agents and methods of use as detection and diagnosis agents and in the treatment of diseases and disorders.The application further provides methods of manufacturing BoNT serotype A capture agents using iterative on-bead in situ click chemistry.