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Synthesis and physical and physiological properties of 4'-thioRNA: application to post-modification of RNA aptamer toward NF- B

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Title: Synthesis and physical and physiological properties of 4'-thioRNA: application to post-modification of RNA aptamer toward NF- B
Authors: Hoshika, Shuichi Browse this author
Minakawa, Noriaki Browse this author
Noriaki, Akira Browse this author
Issue Date: Jul-2004
Publisher: Oxford University Press
Journal Title: Nucleic Acids Research
Volume: 32
Issue: 13
Start Page: 3815
End Page: 3825
Publisher DOI: 10.1093/nar/gkh705
Abstract: We report herein full details of the preparation of 4'-thiouridine, -cytidine, -adenosine and -guanosine phosphoramidites based on our synthetic protocol via the Pummerer reaction. Fully modified 4'-thioRNAs containing four kinds of 4'-thioribonucleoside units were prepared according to the standard RNA synthesis. The Tm values and thermodynamic parameters of a series of duplexes were determined by UV melting and differential scanning calorimetry (DSC) measurements. The resulting overall order of thermal stabilities for the duplexes was 4'-thioRNA:4'-thioRNA >> 4'-thioRNA:RNA > RNA:RNA > RNA:DNA > 4'-thioRNA:DNA. In addition, itwasshownthat the dominant factor in the stability of the duplexes consisting of 4'-thioRNA was enthalpic in character. The CD spectra of not only 4'-thioRNA:RNA and 4'-thioRNA:4'-thioRNA but also 4'-thioRNA:DNA were all similar to those of duplexes in the A-conformation. The stability of 4'-thioRNA in human serum was 600 times greater than that of natural RNA. Neither the RNA:RNA nor the 4'-thioRNA: 4'-thioRNA duplexes were digested under the same conditions. The first example of a post-modification of anRNAaptamer by 4'-thioribonucleoside units was demonstrated. Full modification of the aptamer thioRNA3 resulted in complete loss of binding activity. In contrast, modifications at positions other than the binding site were tolerated without loss of binding activity. The post-modified RNA aptamer thioRNA5 was thermally stabilized and resistant toward nuclease digestion. The results presented in this paper will, it is hoped, contribute to the development of 4'-thioRNA as a new generation of artificial RNA.
Type: article
URI: http://hdl.handle.net/2115/46954
Appears in Collections:薬学研究院 (Faculty of Pharmaceutical Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 松田 彰

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