Recombinant respiratory syncytial viruses with deleted surface glycoprotein genes and uses thereof
The present invention provides recombinant respiratory syncytial viruses (RSV) in which all of the surface glycoprotein genes encoding the attachment protein G, the fusion protein F, and the Small Hydrophobic protein SH are deleted. The genes are replaced by a chimeric gene encoding a heterologous entry protein derived from the Vesicular Stomatitis Virus G protein or GP64 of baculovirus. Alternatively, the replacement proteins are provided in trans. Marker genes such as those encoding β-glucuronidase (GUS) and green fluorescent protein (EGFP) are also added to the upstream and downstream side of the hybrid gene for easy detection. These infectious recombinant respiratory syncytial viruses offer alternatives and improvements as vaccine candidates.
1. A recombinant respiratory syncytial virus in which all of the surface glycoprotein genes encoding the attachment protein G, the fusion protein F, and the Small Hydrophobic protein SH are deleted and replaced by a gene encoding a heterologous protein that mediates cell infection and entry activity of said respiratory syncytial virus.
2. The recombinant respiratory syncytial virus of claim 1 , wherein said heterologous protein includes a cytoplasmic tail domain of respiratory syncytial virus fusion protein F.
3. The recombinant respiratory syncytial virus of claim 2 , wherein said heterologous protein is selected from the group consisting of the G protein of Vesicular Stomatitis Virus and the GP 64 protein of baculovirus.
4. The recombinant respiratory syncytial virus of claim 1 , wherein said virus further contain one or more marker genes.
5. The recombinant respiratory syncytial virus of claim 4 , wherein said marker gene encodes a protein selected from the group consisting of β-glucuronidase and green fluorescent protein.