Chimeric immunogens
Multimeric hybrid genes encoding the corresponding chimeric protein comprise a gene sequence coding for an antigenic region of a protein from a first pathogen linked to a gene sequence coding for an antigenic region of a protein from a second pathogen. The pathogens particularly are parainfluenza virus (PIV) and respiratory syncytial virus (RSV). A single recombinant immunogen is capable of protecting infants and similar susceptible individuals against diseases caused by both PIV and RSV.
1. A multimeric hybrid gene encoding a chimeric protein including a protein from parainfluenza virus (PIV) and a protein from respiratory syncytial virus (RSV), comprising a nucleotide sequence encoding a PIV-3 HN protein or a fragment thereof having hemagglutinin-neurominidase activity linked to a nucleotide sequence coding for a RSV F protein or a fragment thereof having fusion activity.
2. The hybrid gene of claim 1 which is of F RSV -HN PIV-3 hybrid gene.
3. The hybrid gene of claim 1 contained in an expression vector.
4. The hybrid gene of claim 3 in the form of a plasmid which is pD2 RF-HN (ATCC 75388).
5. Eukaryotic cells containing the multimeric hybrid gene of claim 1 for expression of the chimeric protein encoded by the hybrid gene.
6. The cells of claim 5 which are mammalian cells, insect cells, yeast cells or fungal cells.
7. A vector for antigen delivery containing the gene of claim 1 .
8. The vector of claim 7 which is viral vector.
9. The vector of claim 8 wherein said viral vector is selected from the group consisting of poxviral, adenoviral and retroviral viral vectors.
10. The vector of claim 7 which is a bacterial vector.
11. The vector of claim 10 wherein said bacterial vector is selected from salmonella and mycobacteria.
12. A process for the preparation of a chimeric protein including a protein from parainfluenza virus (PIV) and a protein from respiratory syncytial virus (RSV), which comprises:
isolating a first nucleotide sequence encoding a PIV-3 HN protein or a fragment thereof having hemagglutinin-neurominidase activities,
isolating a second nucleotide sequence encoding a RSVF protein or a fragment thereof having fusion activity,
linking said first and second nucleotide sequences to form a multimeric hybrid gene, and
expressing the multimeric hybrid gene in a cellular expression system.
13. The process of claim 12 wherein said multimeric hybrid gene is HN PIV-3 -H RSV hybrid gene.
14. The process of claim 12 wherein said multimeric hybrid gene is contained in an expression vector which is and pD2 RF-HN (ATCC 75388).
15. The process of claim 12 wherein said cellular expression system is provided by mammalian cells, insect cells, yeast cells or fungal cells.
16. The process of claim 12 including separating a chimeric protein from a culture of said eukaryotic cellular expression and purifying the separated chimeric protein.