Abstract: The present invention relates to the field of biomedicine and antibody engineering. Specifically, it relates to mono and multispecific multivalent single chain polypeptide molecules and derivatives thereof, preferably to multispecific single chain (tandem) trimerbodies with defined stoichiometry, to nucleic acid sequences and vectors encoding thereof, and host cells expressing the same. It further relates to methods of producing thereof, pharmaceutical compositions, kits, methods of treatment, use as diagnostics or imaging reagents and combination therapies using thereof.

Abstract: The invention relates to the design of trimeric polypeptide complexes using polypeptide structural elements derived from the collagen XVIII protein, and their use in diagnostic and therapeutic systems in vivo and in vitro. The invention also relates to nucleic acids and vectors useful for producing said trimeric complexes.

Abstract: The invention relates generally to a new trimerization domain useful for developing multifunctional and multivalent complexes. Particularly, the invention relates to the design of trimeric polypeptide complexes using polypeptide structural elements derived from the collagen XV protein, and their use in diagnostic and therapeutic systems in vivo and in vitro. The invention also relates to nucleic acids and vectors useful for producing said trimeric complexes.