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pubmed-article:12799454pubmed:abstractTextAntigenes, which are substances that inhibit gene expression by binding to double-stranded DNA (dsDNA) in a sequence-specific manner, are currently sought for the treatment of various gene-related diseases. As such antigenes, we developed new nuclease-resistant oligopyrimidine nucleotides that are partially modified with 2'-O,4'-C-ethylene nucleic acids (ENA), which are constrained in the C3'-endo conformation and can form a triplex with dsDNA at physiological pH. It was found that these oligonucleotides formed triplexes similarly to those partially modified with 2'-O,4'-C-methylene nucleic acids (2',4'-BNA or LNA), as determined by UV melting analyses, electromobility shift assays, CD spectral analyses and restriction enzyme inhibition assays. In our studies, oligonucleotides fully modified with ENA have delta torsion angle values that are marginally higher than those of 2',4'-BNA/LNA. ENA oligonucleotides present in 10-fold the amount of dsDNA were found to be favorable in forming triplexes. These results provide useful information for the future design of triplex-forming oligonucleotides fully modified with such nucleic acids constrained in the C3'-endo conformation considering that oligonucleotides fully modified with 2',4'-BNA/LNA do not form triplexes.lld:pubmed
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pubmed-article:12799454pubmed:authorpubmed-author:KnowE GEGlld:pubmed
pubmed-article:12799454pubmed:authorpubmed-author:MoritaKojiKlld:pubmed
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pubmed-article:12799454pubmed:authorpubmed-author:ImanishiTakes...lld:pubmed
pubmed-article:12799454pubmed:authorpubmed-author:KoizumiMakoto...lld:pubmed
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pubmed-article:12799454pubmed:dateRevised2010-9-14lld:pubmed
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pubmed-article:12799454pubmed:articleTitleTriplex formation with 2'-O,4'-C-ethylene-bridged nucleic acids (ENA) having C3'-endo conformation at physiological pH.lld:pubmed
pubmed-article:12799454pubmed:affiliationExploratory Chemistry Research Laboratories, Sankyo Co. Ltd, Tokyo 140-8710, Japan. koizum@shina.sankyo.co.jplld:pubmed
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