Antibodies and methods of making same
Provided are variants of a chimeric anti-EGFR antibody. In various embodiments, the variants exhibit substantially improved thermostabilities and/or substantially higher levels of humanness, while retaining binding affinity near the parental level. The consistently high quality of the turnkey CoDAH designs, over a whole panel of variants, suggests that a computationally-directed approach encapsulates key determinants of antibody structure and function.
1. An isolated anti-EGFR monoclonal antibody or antigen binding portion thereof, the antibody or antigen binding portion thereof comprising a heavy chain and a light chain, and wherein the heavy chain comprises an amino acid sequence selected from the group consisting of SEQ ID NO: 3, 4, 5, 6 and 7 and the light chain comprises an amino acid sequence selected from the group consisting of SEQ ID NO: 8, 9, 10, 11 and 12.
2. The isolated anti-EGFR monoclonal antibody or the antigen binding portion thereof of claim 1 , wherein the heavy chain or the light chain is more similar in sequence to a germ-line EGFR antibody sequences than is SEQ ID NO: 1 or SEQ ID NO:2.
3. The isolated anti-EGFR monoclonal antibody or the antigen binding portion thereof of claim 2 , wherein the isolated monoclonal antibody or the antigen binding portion thereof is more similar in sequence to a germ-line EGFR antibody sequence than is a counterpart polypeptide comprising SEQ ID NO:1 or SEQ ID NO:2, and wherein the germ line EGFR antibody sequence is selected from the group consisting of SEQ ID NOs.:19-23.
4. A pharmaceutical composition comprising the isolated anti-EGFR monoclonal antibody, or the antigen-binding portion thereof, of claim 1 .
5. The isolated anti-EGFR monoclonal antibody or the antigen binding portion thereof of claim 1 , wherein the monoclonal antibody or the antigen binding portion thereof is more thermostable than a corresponding isolated monoclonal antibody or an antigen binding portion thereof comprising SEQ ID NO:1 and SEQ ID NO:2 by a melting temperature (TM) of greater than or equal to 0.1° C.
6. The isolated anti-EGFR monoclonal antibody or the antigen binding portion thereof of claim 5 , wherein the monoclonal antibody or the antigen binding portion thereof is more thermostable than a corresponding isolated monoclonal antibody or an antigen binding portion thereof comprising SEQ ID NO:1 and SEQ ID NO:2 by a melting temperature (TM) of greater than or equal to 10.0° C.