Immunogenic composition
The present application relates to immunogenic compositions comprising staphylococcal PNAG which is less than 40% N-acetylated and is conjugated to a carrier protein by a linker bonded to an amine group on PNAG to form a PNAG conjugate. Vaccines, methods of treatment using and processes to make an immunogenic composition comprising PNAG and Type 5 and/or 8 capsular polysaccharides are also described.
1. An immunogenic composition comprising an isolated staphylococcal poly-N-acetylglucosamine (PNAG) which is less than 40% N-acetylated wherein the PNAG is conjugated to a carrier protein by a maleimide linker bonded to an amine group on the PNAG to form a PNAG conjugate, wherein the PNAG conjugate has the structure:
wherein R1 is C1-C6 alkyl and R2 is C1-C6 alkyl;
wherein the linker has a spacer length of 10-20 Angstroms; and
further comprising an isolated Type 8 capsular polysaccharide or oligosaccharide of Staphylococcus aureus.
2. The immunogenic composition of claim 1 comprising an isolated Type 5 capsular polysaccharide or oligosaccharide of S. aureus.
3. The immunogenic composition of claim 1 wherein the linker comprises a peptide bond.
4. An immunogenic composition comprising an isolated staphylococcal poly-N-acetylglucosamine (PNAG) which is less than 40% N-acetylated wherein the PNAG is conjugated to a carrier protein by a maleimide linker bonded to an amine group on the PNAG to form a PNAG conjugate, wherein the PNAG conjugate has the structure:
wherein the linker has a spacer length of 10-20 Angstroms; and
further comprising an isolated Type 8 capsular polysaccharide or oligosaccharide of Staphylococcus aureus.
5. The immunogenic composition of claim 1 wherein the carrier protein is selected from the group consisting of tetanus toxoid, diphtheria toxoid, diphtheria toxoid CRM197, Haemophilus influenzae protein D, Pseudomonas aeruginosa exoprotein A, pneumococcal pneumolysin and alpha toxoid.
6. The immunogenic composition of claim 1 , comprising a pharmaceutically acceptable excipient.
7. The immunogenic composition of claim 4 , wherein the carrier protein is selected from the group consisting of tetanus toxoid, diphtheria toxoid, diphtheria toxoid CRM197, Haemophilus influenzae protein D, Pseudomonas aeruginosa exoprotein A, pneumococcal pneumolysin and alpha toxoid.
8. The immunogenic composition of claim 4 , comprising a pharmaceutically acceptable excipient.
9. A method of eliciting an immune response to staphylococcal PNAG in a mammal comprising administering to the mammal an immunogenically effective amount of the immunogenic composition of claim 6 .
10. A method of making the immunogenic composition of claim 1 comprising mixing the PNAG conjugate and the isolated Type 8 capsular polysaccharide S. aureus or the isolated capsular oligosaccharide of S. aureus and adding a pharmaceutically acceptable excipient.