TARGETED PHOTOCHEMICAL MODIFICATION OF HIV-DERIVED OLIGORIBONUCLEOTIDES BY ANTISENSE OLIGODEOXYNUCLEOTIDES LINKED TO PORPHYRINS(87 visite) Mastruzzo L, Woisard A, Ma DD, Rizzarelli E, Favre A, Le Doan T
Impact factor: 2.426, Impact factor a 5 anni: 2.305
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Antisense oligodeoxynucleotides directed against a 24-mer RNA derived from the long terminal repeat (LTR) region of HIV were linked to proto- and methylpyrroporphyrin and their zinc derivatives. The oligonucleotide-porphyrin conjugates were tested for their ability to induce photodamage on the target RNA. Upon hybridization followed by irradiation at 405 nm, the photochemical reaction led to photocross-linking of the antisense derivative to the RNA substrate. The protoporphyrin exhibited a much higher cross-linking yield than the methylpyrroporphyrin while the Zn-porphyrin derivatives were found to be less efficient than their corresponding nonmetallated congeners. The specificity of the photocross-linking reaction between the porphyrin-oligomer and its target RNA was demonstrated by the following evidence: (1) hybrid formation was required for photocross-linking to occur, (2) the sites of cross-linking on the target RNA were identified at G residues located in close proximity to the porphyrin photoactive center in the hybrid and (3) addition of bulk calf liver RNA did not affect the photocross-linking efficiency.
92 Records (86 escludendo Abstract e Conferenze). Impact factor totale: 362.622 (337.267 escludendo Abstract e Conferenze). Impact factor a 5 anni totale: 362.994 (336.758 escludendo Abstract e Conferenze).
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