Abstract: The present invention relates to methods of purifying proteins containing Fc regions, such as antibodies and Fc fusion proteins. In particular, the present invention relates to a purification method resulting in reduced levels of aggregate protein comprising adsorbing an Fc region-containing protein to a temperature-responsive protein A resin and eluting the protein from the resin at a temperature below 35 C with an elution buffer comprising a chaotropic agent, a sugar alcohol, and at least one amino acid. Methods of separating fully assembled antibodies from half antibody forms thereof using the elution buffer are also described.

Abstract: The present invention is directed to a CH3-containing molecule comprising (a) a first polypeptide comprising a CH3 domain and a negatively charged domain comprising consecutive negatively charged amino acid residues; and (b) a second polypeptide comprising a CH3 domain and a positively charged domain comprising consecutive positively charged amino acid residues. Also provided are methods for conjugating synthetic molecules to a multi-specific antigen binding molecule.

Abstract: The present invention relates to methods of purifying proteins containing Fc regions, such as antibodies and Fc fusion proteins. In particular, the present invention relates to a purification method resulting in reduced levels of aggregate protein comprising adsorbing an Fc region-containing protein to a temperature-responsive protein A resin and eluting the protein from the resin at a temperature below 35 C with an elution buffer comprising a chaotropic agent, a sugar alcohol, and at least one amino acid. Methods of separating fully assembled antibodies from half antibody forms thereof using the elution buffer are also described.