Abstract: The present invention relates to a method of generating a nanoparticle comprising contacting (a) a fusion protein (A), said fusion protein (A) comprising an antibody (A1) and a positively charged polypeptide (A2); (b) a positively charged polypeptide (B); and (c) a negatively charged molecule (C); thereby forming a nanoparticle. The present invention also relates to a nanoparticle obtainable by a method of the invention, as well as to a nanoparticle comprising (a) a fusion protein (A), said fusion protein (A) comprising an antibody (A1) and a positively charged polypeptide (A2); (b) a positively charged polypeptide (B); and (c) one or more negatively charged molecule(s) (C). The present invention also relates to a composition comprising a nanoparticle of the invention and to a nanoparticle or composition of the invention for use in therapy.

Abstract: The present invention relates to a method of generating a nanoparticle comprising (c) contacting an antibody with a composition comprising a first conjugate (A), the first conjugate comprising a positively charged polypeptide conjugated to a bifunctional linker, characterized in that the composition is essentially free of unconjugated bifunctional linker, thereby obtaining a second conjugate (B), the second conjugate comprising the positively charged polypeptide, the bifunctional linker, and the antibody; and (d) contacting the second conjugate (B), a positively charged polypeptide, and a negatively charged molecule, thereby forming a nanoparticle. The present invention also relates to a nanoparticle obtainable by a method of the invention, as well as to a nanoparticle comprising (a) a positively charged polypeptide; (b) a second conjugate (B), the second conjugate comprising an antibody conjugated to a positively charged polypeptide; (c) one or more negatively charged molecules.