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pubmed-article:12050012pubmed:abstractTextThe presence of various modifications within oligomers changes their thermodynamic stability. To get more systematic data, we measured effects of 5- and 6-substituted uridine on thermal stability of (AUCU(Mod.)AGAU)2 and (AUCUAGAU(Mod.))2. Collected results lead to the following conclusions: (i) 5-halogenated and 5-alkylated substituents of the uridine affect thermal stability of the RNA duplexes differently. Moreover, the 5-fluorouridine changes stability of the RNA duplexes opposite to remaining 5-halogenouridines; (ii) for oligomers containing 5-chloro, 5-bromo or 5-iodouridine stronger hydrogen bond formed between oxygen-4 of the 5-halogenated uracil and 6-amino group of the adenine is presumably responsible for stabilizing effect; (iii) placing of A-U(5R) base pairs closer to the end of the duplex enhance thermal stability relatively to oligomer with central position of this base pair; (iv) the effects of 5-substituents are additive, particularly for substituents which stabilize RNA duplexes; (v) 6-methyluridines (N1 and N3 isomers) as well as 3N-methyluridine present at internal position of A-U(Mod.) inhibit duplexes formation; (vi) 6-methyluridines (N1 and N3 isomers) as well as 3N-methyluridine placed as terminal base pairs stabilize the duplexes mostly via 3'-dangling end effect.lld:pubmed
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pubmed-article:12050012pubmed:authorpubmed-author:ZiomekKrzyszt...lld:pubmed
pubmed-article:12050012pubmed:authorpubmed-author:KierzekElzbie...lld:pubmed
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pubmed-article:12050012pubmed:pagination233-41lld:pubmed
pubmed-article:12050012pubmed:dateRevised2008-11-21lld:pubmed
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pubmed-article:12050012pubmed:articleTitleThe thermal stability of RNA duplexes containing modified base pairs placed at internal and terminal positions of the oligoribonucleotides.lld:pubmed
pubmed-article:12050012pubmed:affiliationInstitute of Bioorganic Chemistry, Polish Academy of Sciences, 60-704 Poznañ, Noskowskiego 12/14, Poland.lld:pubmed
pubmed-article:12050012pubmed:publicationTypeJournal Articlelld:pubmed
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