| CPC C07K 14/08 (2013.01) | 18 Claims |
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1. A nucleic acid molecule comprising a nucleotide sequence that encodes an amino acid sequence of an engineered protein comprising a metapneumovirus (MPV) F protein ectodomain having at least 90% identity to amino acids 19-489 of any one of SEQ ID NOs: 4-7, said engineered protein comprising a mutation at positions A140, A147 and A/D185, relative to the sequence of any one of SEQ ID NOs: 4-7, wherein the nucleic acid molecules is an mRNA molecule.
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