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• W2087117158 abstract "The length of the heavy chain complementarity-determining region 2 (CDRH2) was extended beyond what is found in germline genes to improve the binding properties of an anti-estradiol antibody. The previous immunochemical characterization and the molecular modeling of the high affinity (Ka=3.9x10(8)) murine anti-estradiol antibody 57-2 suggested that a part of the antigen was loosely recognized by the antibody. The CDRH2, because of its close location but scarce contacts with the hapten, was considered as a conceivable target for mutagenesis. Libraries with either two, three or four random amino acid insertions in the tip of the CDRH2 loop were constructed and displayed on the M13 filamentous phage as Fab fragments. Mutations were introduced also into the rest of the VHdomain by error-prone polymerase chain reaction to allow the surrounding structures to adapt to the extended CDRH2. After the panning of the libraries with an antigen off-rate-based selection, a number of active clones, most of which showed significantly improved affinity and specificity, were isolated, characterized and sequenced. The results indicate that the structure of the antibody can tolerate a number of different insertions in the CDRH2 region. They also suggest that the repertoire of antibody libraries can be expanded by extending the length of the CDR loops beyond that naturally provided by the given set of germline genes. This kind of mutagenesis can be generally useful for the engineering of hapten-binding antibodies." @default.
• W2087117158 created "2016-06-24" @default.
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• W2087117158 date "1999-08-01" @default.
• W2087117158 modified "2023-10-14" @default.
• W2087117158 title "Expanding the conformational diversity by random insertions to CDRH2 results in improved anti-estradiol antibodies 1 1Edited by A. R. Fersht" @default.
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• W2087117158 doi "https://doi.org/10.1006/jmbi.1999.2981" @default.
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