Abstract
Mismatch binding protein MutS binding to bulge structure in DNA duplexes was controlled by UV irradiation. 4-O-(2-Nitrobenzyl)thymidine or 4-O-[2-(2-nitrophenyl)propyl]thymidine was incorporated into DNA duplexes a bulged position. The MutS did not bind to the caged DNA duplexes but bound after removing the 2-nitrobenzyl or 2-(2-nitrophenyl)propyl group by photo-irradiation. By using photo-caged DNA duplex, we revealed that binding of MutS to the uncaged DNA downstream of the T7 RNA promoter weakly inhibited transcription by T7 RNA polymerase.
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