abstract |
Provided herein are trispecific and/or tri valent binding proteins comprising four polypeptide chains that form three antigen binding sites that specifically bind one or more target proteins, wherein a first pair of polypeptides forming the binding protein possess dual variable domains having a cross-over orientation, and wherein and a second pair of polypeptides possess a single variable domain forming a single antigen binding site. In some embodiments, the binding proteins comprise a binding site that binds a CD28 polypeptide, a binding site that binds a CDS polypeptide, and a binding site that binds a third polypeptide, such as a tumor target protein. The disclosure also relates to methods for making trispecific and/or trivalent binding proteins and uses of such binding proteins. |