Methods of producing bioconjugates of O-antigen polysaccharides covalently linked to a carrier protein using recombinant host cells are provided. The recombinant host cells used in the methods described herein encode a particular oligosaccharyl transferase enzyme depending on the O-antigen polysaccharide bioconjugate to be produced. The oligosaccharyl transferase enzymes can be PglB oligosaccharyl transferase or variants thereof. Also provided are compositions containing the bioconjugates, and methods of using the bioconjugates and compositions described herein to vaccinate a subject against extra-intestinal pathogenic E. coli. (ExPEC).

Provided herein are methods and compositions for displaying a polypeptide on a tubular structure and uses of such displayed polypeptides in the production of antibodies or vaccines.

The present disclosure provides delivery constructs comprising a carrier coupled to a heterologous payload, wherein coupling of the carrier to the payload can result in transportation of the payload (e.g., a therapeutic payload) into and/or across intact polarized epithelial cells (e.g., epithelial cells of the gut of a mammal). The delivery construct can be part of a pharmaceutical composition that can be orally administered to a subject to provide for improved, effective therapies for treatment of, e.g., inflammatory diseases or autoimmune diseases.

The present invention relates to a method for inhibiting, improving, or preventing aging, comprising administering to a subject in need thereof a composition comprising a recombinant protein of flagellin, which is the constituent of Vibrio vulnificus flagella, fused with a pathogenic protein antigen, which is pneumococcal surface protein A (PsaA) of Streptococcus pneumonia. According to the present invention, the recombinant protein of the present invention can improve external and internal aging-related malfunctions and enhance immunity. Also, the composition of the present invention can easily perform immunization through mucosal administration.

The present invention refers to new glycoconjugate antigens expressing built-in multiple epitopes and to polyvalent glycoconjugate vaccines intended for the protection of mammalians, and particularly for the protection of the human population from enteropathogenic bacteria, such as the Gram-positive anaerobic bacterium Clostridium difficile and the Gram-negative bacteria Salmonella typhi, Escherichia coli, Vibrio cholerae, Shigella flexneri, Salmonella typhimurium, Salmonella enteritidis, Salmonella paratyphi A, Shigella sonnei, Shigella dysenteriae, Salmonella cholerasuis, Klebsiella, Enterobacter, Pseudomonas aeruginosa and/or from viral gastrointestinal infections due to human noroviruses.

Vaccine compositions including a yeast comprising an immunostimulatory polypeptide and optionally an antigenic polypeptide are provided herein. The immunostimulatory polypeptide and the antigenic polypeptide are expressed or displayed on the surface of the yeast vaccine composition. Methods of using the vaccine composition to vaccinate subjects are also provided.

This invention relates to the medical use of pathogen associated molecular pattern (PAMP) displaying immunostimulatory microbial immuno-adjuvants [MIAs], as therapeutics when used in combination with check point inhibitors to treat various types of cancer and to methods of treatment which involve treating a subject with these compounds and compound mixtures and process methods for identifying and optimally composing them for their therapeutic use in cancer treatment. It also relates to the use of inhibitors of these PAMP displaying immunostimulatory microbial immuno-adjuvants [MIAs], as therapeutics when used to treat inflammatory bowel disease (IBD) including Crohn's Disease and ulcerative colitis and irritable bowel syndrome (IBS) and process methods for identifying and optimally composing them for their therapeutic use in IBD and IBS.

Immunogenic compositions that include a bacterial capsular polysaccharide conjugated to a carrier protein are described. In some embodiments, the bacterial capsular polysaccharide is a Neisseria meningitidis capsular polysaccharide. The carrier protein includes an N. meningitidis factor H binding protein (fHbp) linked to cholera toxin subunit B (CTB). Administration of the immunogenic compositions elicits an immune response that includes production of meningococcal polysaccharide-specific and fHbP-specific antibodies. Use of the immunogenic compositions as meningococcal vaccines is also described.

The present invention relates to a method of preparing a live attenuated vaccine by irradiation and a live attenuated vaccine composition prepared by the same, and more particularly, a method of preparing a live attenuated vaccine by irradiation including irradiating a pathogenic microorganism with a dose of 0.5 to 2 kGy of radiation per single radiation six to fifteen times; and a live attenuated vaccine composition including a pathogenic microorganism attenuated to not be revertant to a wild type by generation of at least one mutation of nucleotide insertion and nucleotide deletion by irradiation.

The present invention discloses a vaccine formulation in accordance with an illustrative embodiment. The formulation including a live attenuated cholera vaccine strain VCUSM14P; a vaccine medium having starch, cellulose, dextrose, and yeast extract; and a phosphate buffer saline.