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Antigen structural requirements for recognition by a cyclobutane thymine dimer-specific monoclonal antibody
Y Komatsu1, T Tsujino, T Suzuki
1Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo 060, Japan.
Nucleic Acids Research
|October 10, 1997
Summary
The TDM-2 antibody specifically recognizes UV-induced thymine dimers (cis-syn T[cis-syn]T) by interacting with both the dimer and adjacent nucleosides and phosphates. This antibody shows high affinity for single-stranded DNA, crucial for DNA repair research.
Area of Science:
- Molecular Biology
- Biochemistry
- Immunology
Background:
- Monoclonal antibody TDM-2 targets UV-induced cyclobutane pyrimidine dimers (CPDs).
- Previous immunization used heterogeneous DNA, limiting structural understanding of TDM-2 recognition.
Purpose of the Study:
- To elucidate the structural requirements for TDM-2 antigen recognition.
- To characterize the binding specificities of TDM-2 to UV-induced DNA damage.
Main Methods:
- Synthesis of chemically modified DNA antigen analogs.
- Assessment of TDM-2 binding affinity to various synthesized analogs.
- Evaluation of TDM-2 binding to single-stranded vs. double-stranded DNA.
Main Results:
- TDM-2 specifically binds cis-syn thymine dimers, not trans-syn dimers.
- Strong binding observed when the cis-syn dimer is centrally located within nucleotide analogs.
- TDM-2 recognizes adjacent 5' and 3' nucleosides and requires a phosphate group on either side of the dimer.
- High affinity for single-stranded DNA, low affinity for double-stranded DNA.
Conclusions:
- TDM-2 binding is dependent on the precise structure of the cyclobutane pyrimidine dimer and its surrounding nucleotide context.
- The antibody's interaction involves the dimer core, adjacent nucleosides, and phosphate groups.
- TDM-2's preference for single-stranded DNA has implications for its use in detecting DNA damage and repair processes.