Flexible antibodies with nonprotein hinges |
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Authors: | Capon Daniel J Kaneko Naoki Yoshimori Takayuki Shimada Takashi Wurm Florian M Hwang Peter K Tong Xiaohe Adams Staci A Simmons Graham Sato Taka-Aki Tanaka Koichi |
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Affiliation: | Blood Systems Research Institute, San Francisco, CA 94118, USA. dcapon@alum.mit.edu |
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Abstract: | There is a significant need for antibodies that can bind targets with greater affinity. Here we describe a novel strategy employing chemical semisynthesis to produce symmetroadhesins: antibody-like molecules having nonprotein hinge regions that are more flexible and extendible and are capable of two-handed binding. Native chemical ligation was carried out under mild, non-denaturing conditions to join a ligand binding domain (Aβ peptide) to an IgG1 Fc dimer via discrete oxyethylene oligomers of various lengths. Two-handed Aβ-Fc fusion proteins were obtained in quantitative yield and shown by surface plasmon resonance to bind an anti-Aβ antibody with a K(D) at least two orders of magnitude greater than the cognate Aβ peptide. MALDI-TOF MS analysis confirmed the protein/nonprotein/protein structure of the two-handed molecules, demonstrating its power to characterize complex protein-nonprotein hybrids by virtue of desorption/ionization mediated by peptide sequences contained therein. We anticipate many applications for symmetroadhesins that combine the target specificity of antibodies with the novel physical, chemical and biological properties of nonprotein hinges. |
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Keywords: | antibody blood native chemical ligation Aβ peptide PEG MALDI-TOF MS |
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