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Journal Article
Research Support, Non-U.S. Gov't
Molecular characterization of variable heavy and light chain regions of five HIV type 1-specific human monoclonal antibodies.
AIDS Research and Human Retroviruses 1994 December
We have reported the generation and characterization of four HIV-1 neutralizing human monoclonal antibodies. Three antibodies recognize a conformational epitope within the CD4-binding site of HIV-1 gp120 and one recognizes a linear epitope located within the hypervariable V3 domain of gp120. In the present study we report the nucleotide sequences of the cDNAs encoding the variable regions of the heavy and light chains of these antibodies. Molecular characteristics, closet germline genes, and the putative extent of somatic mutation are presented. Two of the four heavy chain variable (VH) regions are derived from the VH1 gene family, one from the VH3 gene family, and one from the VH5 gene family. In addition, the VH chain of a previously described human monoclonal antibody, directed against HIV-1 gp41, is derived from the VH3 gene family. The degree of nucleotide variation between these five antibodies and their closest germline counterparts ranges from 4 to 12%, mainly located in the complementarity-determining regions. Significant nucleotide sequence homology with previously described germline diversity (D) genes could be found for only two of five antibody D segments. Joining (JH) gene segments utilized are JH4 or JH6. Two light chain variable (VL) regions are derived from a VK1 gene segment, one from a V kappa 4, one from a V lambda 2, and one from a lambda 6 gene segment.
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