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- W1554848618 abstract "Abstract mAb Z22 is a highly selective IgG anti-Z-DNA Ab from an immunized C57BL/6 mouse. Previous studies showed that heavy chain CDR3 amino acids are critical for Z-DNA binding by the single chain variable fragment (scFv) comprising both V region heavy chain (VH) and V region light chain (VL) of mAb Z22 and that the VH domain alone binds Z-DNA with an affinity similar to that of whole variable fragment (Fv). To determine whether Z-DNA binding by VH alone and by Fv involves identical complementarity determining region residues, we tested effects of single or multiple amino acid substitutions in recombinant VH, scFv, and associated VH-VL heterodimers. Each recombinant product was a fusion protein with a B domain of Staphylococcal protein A (SPA). Z22VH-SPA alone was not highly selective; it bound strongly to other polynucleotides, particularly polypyrimidines, and ssDNA as well as to Z-DNA. In contrast, scFv-SPA or associated VH-VL dimers bound only to Z-DNA. VL-SPA domains bound weakly to Z-DNA; SPA alone did not bind. Introduction of multiple substitutions revealed that the third complementarity determining region of the heavy chain (CDR3H) was critical for both VH and scFv binding to Z-DNA. However, single substitutions that eliminated or markedly reduced Z-DNA binding by scFv instead caused a modest increase or no reduction in binding by VH alone. Association of VH-SPA with Z22VL-SPA restored both the effects of single substitutions and Z-DNA selectivity seen with Fv and intact Ab. Polypyrimidine and ssDNA binding by the isolated VH domain of immunization-induced anti-Z-DNA Ab resembles the activity of natural autoantibodies and suggests that VH-dependent binding to a ligand mimicked by polypyrimidines may play a role in B cell selection before immunization with Z-DNA." @default.
- W1554848618 created "2016-06-24" @default.
- W1554848618 creator A5037458498 @default.
- W1554848618 creator A5053689073 @default.
- W1554848618 date "1999-04-15" @default.
- W1554848618 modified "2023-10-11" @default.
- W1554848618 title "DNA Binding by the VH Domain of Anti-Z-DNA Antibody and Its Modulation by Association of the VL Domain" @default.
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- W1554848618 doi "https://doi.org/10.4049/jimmunol.162.8.4663" @default.
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