The present invention relates to an EPRS (glutamyl-prolyl-tRNA synthetase) protein or a fragment thereof. The EPRS protein of the present invention or fragment thereof may bind to PCBP2 protein to activate the MAVS signaling pathway, and thus it has anti-RNA viral effects, thereby being effective for preventing or treating a RNA viral infectious disease.

Embodiments of the claimed invention describe methods for making a multimeric nanobody assembly. In some embodiments, a method for making a multimeric nanobody assembly comprises providing polynucleic acids that encode for nanobodies, wherein the polynucleic acids each further comprise at least one selector codon at a preselected position, providing a non-peptide linker comprising a strained alkene functional group, and providing a translational system, wherein the polynucleic acids are translated by the translational system to encode the nanobodies, and wherein the tetrazine amino acids react with the strained alkene functional group to produce the multimeric nanobody assembly.

The present invention relates to an EPRS (glutamyl-prolyl-tRNA synthetase) protein or a fragment thereof.

The EPRS protein of the present invention or fragment thereof may bind to PCBP2 protein to activate the MAVS signaling pathway, and thus it has anti-RNA viral effects, thereby being effective for preventing or treating a RNA viral infectious disease.