A monoclonal antibody specific for the duplex DNA poly[d(TC)].poly[d(GA)]

Area of Science:

• Immunology
• Molecular Biology
• Biochemistry

Background:

• Most duplex deoxyribonucleic acids (DNAs) are not immunogenic.
• Certain synthetic DNAs, like poly[d(Tm5C)].poly[d(GA)], exhibit weak immunogenicity, enabling monoclonal antibody production.

Purpose of the Study:

• To investigate the specificity of the monoclonal antibody Jel 172.
• To determine the DNA sequence and structural features recognized by Jel 172.

Main Methods:

• Competitive solid-phase radioimmunoassay was employed to assess antibody binding.
• Binding affinities were tested against various synthetic duplex DNA sequences.

Main Results:

• Jel 172 demonstrated strong binding to poly[d(TC)].poly[d(GA)].
• Binding was significantly reduced with other duplex DNA sequences, including poly[d(TTC)].poly[d(GAA)] and poly[d(TCC)].poly[d(GGA)].
• Binding was enhanced by 5-bromouracil substitution (poly[d(Br5UC)].poly[d(GA)]) and decreased by inosine substitution (poly[d(TC)].poly[d(IA)]).

Conclusions:

• The antibody Jel 172 exhibits high specificity for a particular duplex DNA sequence.
• The antibody appears to recognize functional groups in both the major and minor grooves of the DNA helix.