Volume 105, Issue 3 pp. 811-816

Synthesis of Rh Fv phage-antibodies using VH and VL germline genes

Nevin Hughes-Jones

Nevin Hughes-Jones

Molecular Immunopathology Unit and Centre for Protein Engineering, Medical Research Council, Cambridge,

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Jacqueline Bye

Jacqueline Bye

Molecular Immunopathology Unit and Centre for Protein Engineering, Medical Research Council, Cambridge,

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Barbara Gorick

Barbara Gorick

Molecular Immunopathology Unit and Centre for Protein Engineering, Medical Research Council, Cambridge,

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James Marks

James Marks

Molecular Immunopathology Unit and Centre for Protein Engineering, Medical Research Council, Cambridge,

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Willem Ouwehand

Willem Ouwehand

Department of Haematology, University of Cambridge, Cambridge, and National Blood Service East Anglia

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First published: 20 April 2002
Citations: 23
Dr W. H. Ouwehand, Division of Transfusion Medicine, Department of Haematology, University of Cambridge, Long Road, Cambridge CB2 2PT. e-mail: [email protected]

Abstract

Antibodies to the D antigen of the Rh system use a restricted set of immunoglobulin V and J gene segments, especially VH DP50 and DP63, JH6, Vλ DPL16 and Jλ 2/3. These gene segments may confer a natural affinity on the antibodies for the D antigen and this hypothesis has been tested by constructing two single-chain Fv phage-antibody libraries based on the germline gene segments DP50 and DP63; structural variability was obtained by insertion of 11 amino acids in random sequence in the VHCDR3. 10 anti-D antibodies were selected from these libraries, each with a unique VHCDR3. In contrast, selections with the CcEe antigens produced antibodies reacting with the Rh polypeptide molecules but without strict blood group specificity. One of these latter DP50-based antibodies was converted into 12 different antibodies with specificity for E by replacing the original germline light chain with chains from a rearranged L chain library. The CDR1 and CDR2 sequences of the DP50-based antibodies were common to both anti-D and anti-E molecules; differentiation between D and E specificity was dependent on VHCDR3 sequences and their correct pairing with an appropriate L chain.

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