Available Technology

New Cholera Vaccine and Method for Conjugating Bacterial Polysaccharides to Proteins

A new conjugate vaccine for cholera has been developed. The invention includes a new method to conjugate the O-specific polysaccharide-core part of the bacterial lipopolysaccharide and protein subcomponents. Conventional technology has entailed chemical treatment of both components to introduce linkers, which made them amenable for covalent linking. The new method simplifies production by utilizing squaric acid chemistry for conjugating the free amine-containing species (e.g. polysaccharides) directly to amine-containing species (e.g. proteins) without prior modification of either component. While demonstrated in this new cholera prototype vaccine, the technology is envisioned as generally applicable, thereby streamlining a complex production process.
Patent Abstract: 
A new conjugate vaccine for cholera has been developed. The invention includes a new method to conjugate the O-specific polysaccharide-core part of the bacterial lipopolysaccharide and protein subcomponents. Conventional technology has entailed chemical treatment of both components to introduce linkers, which made them amenable for covalent linking. The new method simplifies production by utilizing squaric acid chemistry for conjugating the free amine-containing species (e.g. polysaccharides) directly to amine-containing species (e.g. proteins) without prior modification of either component. While demonstrated in this new cholera prototype vaccine, the technology is envisioned as generally applicable, thereby streamlining a complex production process.
Benefits 
The method in the present form is simple to perform, gives reproducible results, allows preparation of carbohydrate-protein constructs in a predictable way, and appears to be superior to protocols developed earlier.
applications 
Inventors: 
Pavol Kovac
Patent Number: 
61/507,054 US Application No. 61/569,632 PCT Appli
Internal Laboratory Ref #: 
E-234-2011/0
Lab Representatives
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