Corona virus vaccine formulations
Disclosed herein are coronavirus Spike (S) proteins and nanoparticles comprising the same, which are suitable for use in vaccines. The nanoparticles present antigens from pathogens surrounded to and associated with a detergent core resulting in enhanced stability and good immunogenicity. Dosages, formulations, and methods for preparing the vaccines and nanoparticles are also disclosed.
1. A non-naturally occurring sudden acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike (CoV S) glycoprotein, wherein the CoV S glycoprotein comprises two modifications compared to a native S glycoprotein wherein
(i) the first modification is an inactivated furin cleavage site having the amino acid sequence of QQAQ (SEQ ID NO: 7); and
(ii) the second modification is mutation of amino acids 973 and 974 to proline;
wherein the amino acids are numbered according to SEQ ID NO: 2.
2. An isolated host cell comprising the CoV S glycoprotein of claim 1 .
3. The isolated host cell of claim 2 , wherein the cell is an insect cell.
4. The isolated host cell of claim 3 , wherein the insect cell is selected from the group consisting of a Spodoptera frugiperda 9 (Sf9) cell, a Spodoptera frugiperda 21 (Sf21) cell, a Trichoplusia ni cell, and a Drosophila S2 cell.
5. The isolated host cell of claim 3 , wherein the insect cell is a Sf9 cell.
6. An isolated nucleic acid encoding the CoV S glycoprotein of claim 1 .
7. An isolated host cell expressing the isolated nucleic acid of claim 6 .
8. An immunogenic composition comprising the CoV S glycoprotein of claim 1 and a pharmaceutically acceptable buffer.
9. The immunogenic composition of claim 8 , comprising about 5 μg of the CoV S glycoprotein.
10. The immunogenic composition of claim 8 , comprising about 3 μg of the CoV S glycoprotein.
11. The immunogenic composition of claim 8 , comprising a saponin adjuvant.
12. The immunogenic composition of claim 11 , wherein the saponin adjuvant comprises:
(i) a first iscom particle comprising fraction A of Quillaja saponaria Molina and not fraction C of Quillaja saponaria Molina; and
(ii) a second iscom particle comprising fraction C of Quillaja saponaria Molina and not fraction A of Quillaja saponaria Molina.
13. The immunogenic composition of claim 12 , wherein fraction A of Quillaja saponaria Molina and fraction C of Quillaja saponaria Molina account for about 85% by weight and about 15% by weight; respectively, of the sum of the weights of fraction A of Quillaja saponaria Molina and fraction C of Quillaja saponaria Molina in the saponin adjuvant.
14. The immunogenic composition of claim 11 , comprising about 50 μg of the saponin adjuvant.
15. The immunogenic composition of claim 8 , comprising a nanoparticle comprising the CoV S glycoprotein and a non-ionic detergent core, wherein the CoV S glycoprotein is anchored to the detergent core via the transmembrane domain of the CoV S glycoprotein.
16. The immunogenic composition of claim 15 , wherein the non-ionic detergent is selected from the group consisting of polysorbate-20 (PS20), polysorbate-40 (PS40), polysorbate-60 (PS60), polysorbate-65 (PS65), and polysorbate-80 (PS80).
17. The immunogenic composition of claim 16 , wherein the non-ionic detergent is PS80.
18. A method of stimulating an immune response against SARS-CoV-2 in a subject comprising administering the immunogenic composition of claim 8 .
19. The method of claim 18 , wherein the immunogenic composition comprises about 5 μg of CoV S glycoprotein.
20. The method of claim 18 , wherein the immunogenic composition comprises about 3 μg of CoV S glycoprotein.
21. The method of claim 18 , wherein the immunogenic composition comprises a nanoparticle comprising the CoV S glycoprotein and a non-ionic detergent core, wherein the CoV S glycoprotein is anchored to the detergent core via the transmembrane domain of the CoV S glycoprotein.
22. The method of claim 21 , wherein the non-ionic detergent is selected from the group consisting of polysorbate-20 (P520), polysorbate-40 (PS40), polysorbate-60 (PS60), polysorbate-65 (PS65), and polysorbate-80 (PS80).
23. The method of claim 22 , wherein the non-ionic detergent is PS80.
24. The method of claim 18 , wherein the subject is administered a first dose at day 0 and a boost dose at day 21.
25. The method of claim 18 , wherein a single dose of the immunogenic composition is administered.
26. The method of claim 18 , comprising administering a second immunogenic composition before or after the immunogenic composition of claim 8 is administered.
27. The method of claim 26 , wherein the second immunogenic composition is the immunogenic composition of claim 8 .
28. The method of claim 26 , wherein the second immunogenic composition is a different immunogenic composition than the immunogenic composition of claim 8 .
29. The method of claim 28 , wherein the second immunogenic composition is selected from the group consisting of an mRNA encoding a SARS-CoV-2 Spike glycoprotein, a plasmid DNA encoding a SARS-CoV-2 Spike glycoprotein, a viral vector encoding a SARS-CoV-2 Spike glycoprotein, and an inactivated SARS-CoV-2 virus.
30. The method of claim 18 , wherein the immunogenic composition comprises a saponin adjuvant.
31. The method of claim 30 , wherein the saponin adjuvant comprises:
(i) a first iscom particle comprising fraction A of Quillaja saponaria Molina and not fraction C of Quillaja saponaria Molina; and
(ii) a second iscom particle comprising fraction C of Quillaja saponaria Molina and not fraction A of Quillaja saponaria Molina.
32. The method of claim 31 , wherein fraction A of Quillaja saponaria Molina and fraction C of Quillaja saponaria Molina account for about 85% by weight and about 15% by weight, respectively, of the sum of the weights of fraction A of Quillaja saponaria Molina and fraction C of Quillaja saponaria Molina in the saponin adjuvant.
33. The method of claim 30 , wherein the immunogenic composition comprises about 50 μg of saponin adjuvant.
34. The immunogenic composition of claim 8 , comprising from about 3 μg to 25 μg of the CoV S glycoprotein.