Imidazole Tethered Oligodeoxyribonucleotides: Synthesis and RNA Cleaving Activity
                                
                                    
                                        作者:Jari Hovinen、Andrei Guzaev、Elena Azhayeva、Alex Azhayev、Harri Lonnberg                                    
                                    
                                        DOI:10.1021/jo00112a047
                                    
                                    
                                        日期:1995.4
                                    
                                    A solid support (3) and a non-nucleosidic phosphoramidite building block (4), both containing a thioester bond is their structure, were synthesized. They were used in the preparation of oligonucleotides tethered to an imidazole group at their 3'- or 5'-terminus, as well as at the 1'-position of nonterminal 3'-deoxypsicothymidine units. The desired functional groups were introduced during the deprotection of the oligonucleotide by using the primary amino group of histamine or 1-(3-aminopropyl)imidazole as a nucleophile. The ability of the tethered oligonucleotides to hydrolyze complementary RNA strands was tested. Of the oligonucleotides prepared, 12b, bearing a histamine group at the 3'-end, was shown to promote a sequence specific strand scission of RNA in the presence of Zn2+ ions.