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Angew Chem Int Ed Engl. 2015 Feb 9;54(7):2126-30. doi: 10.1002/anie.201410049. Epub 2014 Dec 29.

Rational design of a humanized glucagon-like peptide-1 receptor agonist antibody.

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California Institute for Biomedical Research (Calibr), 11119 N. Torrey Pines Road, La Jolla, CA 92037 (USA).


Bovine antibody BLV1H12 possesses a unique "stalk-knob" architecture in its ultralong heavy chain CDR3, allowing substitutions of the "knob" domain with protein agonists to generate functional antibody chimeras. We have generated a humanized glucagon-like peptide-1 (GLP-1) receptor agonist antibody by first introducing a coiled-coil "stalk" into CDR3H of the antibody herceptin. Exendin-4 (Ex-4), a GLP-1 receptor agonist, was then fused to the engineered stalk with flexible linkers, and a Factor Xa cleavage site was inserted immediately in front of Ex-4 to allow release of the N-terminus of the fused peptide. The resulting clipped herceptin-Ex-4 fusion protein is more potent in vitro in activating GLP-1 receptors than the Ex-4 peptide. The clipped herceptin-Ex-4 has an extended plasma half-life of approximately four days and sustained control of blood glucose levels for more than a week in mice. This work provides a novel approach to the development of human or humanized agonist antibodies as therapeutics.


antibodies; peptide; pharmacology; protein engineering; receptors

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