Structural highlights
Publication Abstract from PubMedA large number of chemically modified oligonucleotides (ONs) have been developed for RNA-based technologies. In most modified RNAs, the characteristic 2'-hydroxyl (2'-OH) groups are removed to enhance both nuclease resistance and hybridization ability. However, the importance of the 2'-OH group in RNA structure and function is well known. Here, we report the synthesis and properties of 4'-selenoRNA in which all four nucleoside units retain the 2'-OH groups but contain a selenium atom instead of an oxygen atom at the 4'-position of the furanose ring. 4'-SelenoRNA has enhanced ability to form duplexes with RNA, and high endonuclease resistance despite the presence of the 2'-OH groups. X-ray crystallography analysis showed that the 4'-selenoRNA duplex adopts an A-conformation, similar to natural RNA, although one 4'-selenocytidine residue has unusual South-type sugar puckering. Furthermore, preliminary studies using 4'-seleno-modified siRNAs suggest that 4'-selenoRNA may be applicable to RNA interference technology. Collectively, our results raise the possibility of a new class of modified RNA in which 2'-OH groups do not need to be masked. Synthesis and properties of fully-modified 4'-selenoRNA, an endonuclease-resistant RNA analog.,Ota M, Takahashi H, Nogi Y, Kagotani Y, Saito-Tarashima N, Kondo J, Minakawa N Bioorg Med Chem. 2022 Dec 15;76:117093. doi: 10.1016/j.bmc.2022.117093. Epub 2022 , Nov 19. PMID:36434923[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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