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481.
Sequence-targeted photochemical modifications of nucleic acids by complementary oligonucleotides covalently linked to porphyrins 总被引:2,自引:0,他引:2
T Le Doan D Praseuth L Perrouault M Chassignol N T Thuong C Hélène 《Bioconjugate chemistry》1990,1(2):108-113
Porphyrins linked to oligonucleotides produce various types of photodamage on a complementary target DNA. The observed reactions include oxidation of guanine bases and cross-linking reactions of the oligonucleotide to its target sequence. Guanines located close to the porphyrin macrocycle were the most altered as compared to more remote guanines on the target sequence. No specific reaction was observed when the complexes were dissociated at temperatures above the melting temperature of the oligonucleotide-target hybrid. Both cross-linking and oxidation reactions accounted for ca. 60% modification of the target chains in the complex. Our results show that oligonucleotides covalently linked to porphyrins are efficient systems for inducing irreversible sequence-specific photodamage on a target DNA. 相似文献
482.
Inhibition of polypeptide chain elongation with the mRNA-complementary (antisense) oligonucleotide has been realized through a RNase H independent mechanism. Nuclease resistant complementary non-natural alpha-17-mer oligonucleotide did not inhibit cell-free protein biosynthesis of beta-globin in the wheat germ system because it did not elicit RNase H activity. Linkage of alkylating group [4-(N-2-chloroethyl-N-methyl)-aminobenzyl]-methylamine to the 5'-terminus of the alpha-oligomer led to the formation of its covalent adduct with mRNA which could not be translated in vitro. Linkage of hydrophobic residues to the terminal phosphates of natural oligonucleotides increased their stability against nucleases and uptake by human cancer cells. A porphyrin, substituted in the meso-position by aromatic groups, gave a rise to an approximately six-fold increase of uptake and cholesterol a 30-100-fold increase. Eighty percent of bound derivatives were found in cytoplasmic cellular fractions. 相似文献
483.
After publication of this paper, the authors determined an error in the funding information. It was written as Grant B2007-SHP-32, but it should be Grant B2017-SPH-32. 相似文献
484.
Magdalena Niedziakowska Karolina Doan Marcin Grny Maciej Sykut Krzysztof Stefaniak Natalia Piotrowska Bogumia Jdrzejewska Bogdan Ridush Sawomira Paweczyk Pawe Mackiewicz Ulrich Schmlcke Pavel Kosintsev Daniel Makowiecki Maxim Charniauski Dariusz Krasnodbski Eve Ranname Urmas Saarma Marine Arakelyan Ninna Manaseryan Vadim V. Titov Pavel Hulva Adrian Blescu Ralph Fyfe Jessie Woodbridge Katerina Trantalidou Vesna Dimitrijevi Oleksandr Kovalchuk Jarosaw Wilczyski Theodor Obad Grzegorz Lipecki Alesia Arabey Ana Stankovi 《Journal of Biogeography》2021,48(1):147-159
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