Volume 80, Issue 3 pp. 896-912
Research Article

A universal combinatorial design of antibody framework to graft distinct CDR sequences: A bioinformatics approach

Jaafar N. Haidar

Corresponding Author

Jaafar N. Haidar

Department of Antibody Technology, ImClone Systems, a Wholly-Owned Subsidiary of Eli Lilly and Company, Alexandria Center for Life Sciences, New York, New York 10016

Jaafar N. Sleiman Haidar and Qing-An Yuan contributed equally to this work.

Jaafar N. Haidar, Department of Antibody Technology, ImClone Systems, a Wholly-Owned Subsidiary of Eli Lilly and Company, Alexandria Center for Life Sciences, New York, New York 10016===Search for more papers by this author
Qing-An Yuan

Qing-An Yuan

Department of Antibody Technology, ImClone Systems, a Wholly-Owned Subsidiary of Eli Lilly and Company, Alexandria Center for Life Sciences, New York, New York 10016

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Lin Zeng

Lin Zeng

Department of Antibody Technology, ImClone Systems, a Wholly-Owned Subsidiary of Eli Lilly and Company, Alexandria Center for Life Sciences, New York, New York 10016

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Mark Snavely

Mark Snavely

Department of Antibody Technology, ImClone Systems, a Wholly-Owned Subsidiary of Eli Lilly and Company, Alexandria Center for Life Sciences, New York, New York 10016

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Xenia Luna

Xenia Luna

Department of Antibody Technology, ImClone Systems, a Wholly-Owned Subsidiary of Eli Lilly and Company, Alexandria Center for Life Sciences, New York, New York 10016

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Haifan Zhang

Haifan Zhang

Department of Antibody Technology, ImClone Systems, a Wholly-Owned Subsidiary of Eli Lilly and Company, Alexandria Center for Life Sciences, New York, New York 10016

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Wei Zhu

Wei Zhu

Department of Antibody Technology, ImClone Systems, a Wholly-Owned Subsidiary of Eli Lilly and Company, Alexandria Center for Life Sciences, New York, New York 10016

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Dale L. Ludwig

Dale L. Ludwig

Department of Antibody Technology, ImClone Systems, a Wholly-Owned Subsidiary of Eli Lilly and Company, Alexandria Center for Life Sciences, New York, New York 10016

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Zhenping Zhu

Zhenping Zhu

Department of Antibody Technology, ImClone Systems, a Wholly-Owned Subsidiary of Eli Lilly and Company, Alexandria Center for Life Sciences, New York, New York 10016

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First published: 11 November 2011
Citations: 30

Abstract

Antibody (Ab) humanization is crucial to generate clinically relevant biologics from hybridoma-derived monoclonal antibodies (mAbs). In this study, we integrated antibody structural information from the Protein Data Bank with known back-to-mouse mutational data to build a universal consensus of framework positions (10 heavy and 7 light) critical for the preservation of the functional conformation of the Complimentarity Determining Region of antibodies. On the basis of FR consensus, we describe here a universal combinatorial library suitable for humanizing exogenous antibodies by CDR-grafting. The six CDRs of the murine anti-human EGFR Fab M225 were grafted onto a distinct (low FR sequence similarity to M225) human FR sequence that incorporates at the 17 FR consensus positions the permutations of the naturally observed amino acid diversities. Ten clones were selected from the combinatorial library expressing phage-displayed humanized M225 Fabs. Surprisingly, 2 of the 10 clones were found to bind EGFR with stronger affinity than M225. Cell-based assays demonstrated that the 10 selected clones retained epitope specificity by blocking EGFR phosphorylation and thus hindering cellular proliferation. Our results suggest that there is a universal and structurally rigid near-CDR set of FR positions that cooperatively support the binding conformation of CDRs. Proteins 2011. © 2012 Wiley Periodicals, Inc.

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