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8-Methoxypsoralen photoadduct formation in complementary oligonucleotides containing a cross-linkable site
J Park1, L Amici, F P Gasparro
1Department of Dermatology, Yale University, New Haven, Connecticut, USA.
Photodermatology, Photoimmunology & Photomedicine
|June 1, 1995
Abstract:
The complete profile of 8-methoxypsoralen photoadduct formation in complementary oligonucleotides (5'-GAGTATGAG and 5'-CATAC) has been determined. Equimolar solutions of the oligonucleotides were irradiated at 4 degrees C in order to stabilize the mini-double helix. Photomodified oligonucleotides were separated by reversed phase chromatography on a Vydac C4 column. Photoadduct formation favored the 5'TAT site in the 9mer over the 5'ATA site in the 5mer by a factor of two. Split-dose studies showed that the monoadducts formed on GAGTATGAG were preferentially converted to cross-links by an additional UVA exposure.