Unraveling the Photochemistry of the 5-Azido-2′-deoxyuridine Photoaffinity Label
摘要:
UV irradiation of 5-azido-2'-deoxyuridine in water provides tip to seven products. All likely result from a pivotal azirene, formed by the intramolecular rearrangement of the initially formed nitrene, that undergoes nucleophilic addition at its C5 position. This study strongly suggests that only nucleophilic amino acid residues in close proximity are cross-linkable in photolabeling experiments by using the 5-azidouracil photophore.