The present specification reports a polypeptide-
linker-
nucleic acid conjugate, wherein the
linker comprises a 3-aminopropanamide unit, a 2,6-diaminohexanoic acid
amide unit, and a 1,4,5,5a,6,6a,7,8-octahydrocyclopropa[5,6]cycloocta[1,2-d]-1,2,3-
triazole unit, the polypeptide comprises a C-terminal
lysine residue, the
nucleic acid comprises an
oxygen atom at the 5' or 3' end linked to a
phosphorus atom in
oxidation state V, and the 3-amino group of the 3-aminopropanamide unit and the carboxy functional group of the
lysine residue of the polypeptide are linked by / form an
amide bond, and the 3-aminopropanamide unit is linked to the carboxy functional group of the
lysine residue of the polypeptide. The carboxyl functional group at position 1 and the alpha amino group of the 2,6-diaminohexanoic acid
amide unit are linked by / form an amide bond, the 6-amino group of the 2,6-diaminohexanoic acid amide unit is the
nitrogen of the 1,2,3-
triazole element of the 1,4,5,5a,6,6a,7,8-octahydrocyclopropa[5,6]cycloocta[1,2-d]-1,2,3-
triazole unit, and the
oxygen linked to the
phosphorus atom of the
nucleic acid is covalently linked to the
cyclopropane element of the 1,4,5,5a,6,6a,7,8-octahydrocyclopropa[5,6]cycloocta[1,2-d]-1,2,3-triazole unit.