DNA cleavage reaction of antitumour antibiotic, kapurimycin A3, with deoxytetranucleotide d(CGCG)2
摘要:
Kapurimycin A3 (kap A3, 1), an antitumour antibiotic, alkylates N7 of guanine2 (G2) and G4 of d(C1G2C3G4)2 to produce their covalent adducts 2 (64 %) and 3 (7.0 %), respectively. Heating at 90-degrees-C for 5 min degraded both adducts to kap A3 - G adduct (5) with the concurrent release of their respective abasic-site containing oligomers 4 and 6.
self-complementary tetradeoxyribonucleoside triphosphates were prepared by a simplified method which enabled us to omit purification of synthetic intermediates and provided the tetramers very rapidly and conveniently. The tetramers were characterized by enzyme assay and their conformations were studied by the use of UV and CD spectroscopic methods under various conditions. The detailed analysis of the CD spectra
Kapurimycin A3 (kap A3, 1), an antitumour antibiotic, alkylates N7 of guanine2 (G2) and G4 of d(C1G2C3G4)2 to produce their covalent adducts 2 (64 %) and 3 (7.0 %), respectively. Heating at 90-degrees-C for 5 min degraded both adducts to kap A3 - G adduct (5) with the concurrent release of their respective abasic-site containing oligomers 4 and 6.