Caffieri S, Miolo G, Dall'Acqua F, Benetollo F, Bombieri G. Photoaddition of 4,6-dimethyltetrahydrobenzoangelicin to thymine in DNA: X-ray studies and experiments with model oligonucleotides.
Photochem Photobiol 2000;
72:23-7. [PMID:
10911725 DOI:
10.1562/0031-8655(2000)072<0023:podtti>2.0.co;2]
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Abstract
The crystal structures of 4,6-dimethyltetrahydrobenzoangelicin (THBA), a furocoumarin analog, and of its furan-side cis-syn cycloadduct with thymine formed in the photoreaction with DNA, have been determined. The crystal structure of the latter compound contained only one enantiomeric form corresponding to the addition to a 5'-XpT site. Contrary to most psoralen derivatives studied, THBA showed higher photoreactivity toward synthetic oligonucleotides containing that sequence than toward those with the 5'-TpX sequence.
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