The heavy chain variable region genes of 5 human polyreactive mAbs generated in our laboratory have been cloned and sequenced using polymerase chain reaction (PCR) technique. We found that 2 and 3 mAbs utilized genes ...The heavy chain variable region genes of 5 human polyreactive mAbs generated in our laboratory have been cloned and sequenced using polymerase chain reaction (PCR) technique. We found that 2 and 3 mAbs utilized genes of the VHIV and VHIII families, respectively. The former 2 VH segments were in germline configuration. A common VH segment, with the best similarity of 90.1 % to the published VHIII germline genes, was utilized by 2 different rearranged genes encoding the V regions of other 3 mAbs. This strongly suggests that the common VH segment is a unmutated copy of an unidentified germline VHIII gene. All these polyreactive mAbs displayed a large NDN region (VH-D-JH junction). The entire H chain V regions of these polyreactive mAbs are unusually basic. The analysis of the charge properties of these mAbs as well as those of other poly- and mono- reactive mAbs from literatures prompts us to propose that the charged amino acids with a particular distribution along the H chain V region,especially the binding sites (CDRs), may be an important structural feature involved in antibody polyreactivity.展开更多
A murine monoclonal antibody HAb27 specific for human hepatocarcinoma has been developed for radioimmunolocalization in animal models. The isotype of this antibody was IgGl, k. In the present study, we used a set of...A murine monoclonal antibody HAb27 specific for human hepatocarcinoma has been developed for radioimmunolocalization in animal models. The isotype of this antibody was IgGl, k. In the present study, we used a set of oligonucleotide primers to amplify the cDNA of mouse immunoglobulin heavy and light chain variable region genes by the polymerase chain reaction. Sequence analysis of the heavy variable region indicated that the VH region was highly homologous to the plasmacytoma cell line MOPC21 gene, and closely related to germline genes of the VHⅢ family. The JH region was encoded by the JH3 gene. For the light chain, the VK segment of the antibody showed the highest homology to the germline VKOXl gene,and the JK region was JK5.展开更多
文摘The heavy chain variable region genes of 5 human polyreactive mAbs generated in our laboratory have been cloned and sequenced using polymerase chain reaction (PCR) technique. We found that 2 and 3 mAbs utilized genes of the VHIV and VHIII families, respectively. The former 2 VH segments were in germline configuration. A common VH segment, with the best similarity of 90.1 % to the published VHIII germline genes, was utilized by 2 different rearranged genes encoding the V regions of other 3 mAbs. This strongly suggests that the common VH segment is a unmutated copy of an unidentified germline VHIII gene. All these polyreactive mAbs displayed a large NDN region (VH-D-JH junction). The entire H chain V regions of these polyreactive mAbs are unusually basic. The analysis of the charge properties of these mAbs as well as those of other poly- and mono- reactive mAbs from literatures prompts us to propose that the charged amino acids with a particular distribution along the H chain V region,especially the binding sites (CDRs), may be an important structural feature involved in antibody polyreactivity.
文摘A murine monoclonal antibody HAb27 specific for human hepatocarcinoma has been developed for radioimmunolocalization in animal models. The isotype of this antibody was IgGl, k. In the present study, we used a set of oligonucleotide primers to amplify the cDNA of mouse immunoglobulin heavy and light chain variable region genes by the polymerase chain reaction. Sequence analysis of the heavy variable region indicated that the VH region was highly homologous to the plasmacytoma cell line MOPC21 gene, and closely related to germline genes of the VHⅢ family. The JH region was encoded by the JH3 gene. For the light chain, the VK segment of the antibody showed the highest homology to the germline VKOXl gene,and the JK region was JK5.
