Synthesis of small interfering RNAs containing acetal-type nucleoside analogs at their 3′-ends and analysis of their silencing activity and their ability to bind to the Argonaute2 PAZ domain
摘要:
In this study, we aimed to create small interfering RNAs (siRNAs) with increased silencing activities and nuclease resistance properties. Therefore, we designed and synthesized five types of siRNA containing acetal-type nucleoside analogs at their 3'-dangling ends. We found that the siRNA containing 1-O-(2,2,2-trifluoroethyl)-beta-D-ribofuranose at the 3'-dangling end was the most potent among the synthesized siRNAs and showed more resistance to nucleolytic degradation by a 3' exonuclease than a natural RNA did. Thus, modification of siRNAs by addition of 1-O-(2,2,2-trifluoroethyl)-beta-D-ribofuranose may hold promise as a means of improving the silencing activity and nuclease resistance of siRNAs. (C) 2015 Elsevier Masson SAS. All rights reserved.
Synthesis of small interfering RNAs containing acetal-type nucleoside analogs at their 3′-ends and analysis of their silencing activity and their ability to bind to the Argonaute2 PAZ domain
摘要:
In this study, we aimed to create small interfering RNAs (siRNAs) with increased silencing activities and nuclease resistance properties. Therefore, we designed and synthesized five types of siRNA containing acetal-type nucleoside analogs at their 3'-dangling ends. We found that the siRNA containing 1-O-(2,2,2-trifluoroethyl)-beta-D-ribofuranose at the 3'-dangling end was the most potent among the synthesized siRNAs and showed more resistance to nucleolytic degradation by a 3' exonuclease than a natural RNA did. Thus, modification of siRNAs by addition of 1-O-(2,2,2-trifluoroethyl)-beta-D-ribofuranose may hold promise as a means of improving the silencing activity and nuclease resistance of siRNAs. (C) 2015 Elsevier Masson SAS. All rights reserved.
Direct Glycosylation of Unprotected and Unactivated Carbohydrates under Mild Conditions
作者:Matthias Pfaffe、Rainer Mahrwald
DOI:10.1021/ol203329u
日期:2012.2.3
Ligand exchange acetalization of acetals in the presence of catalytic amounts of mandelic acid and titanium tert-butoxide is reported. This transformation is successfully extended to glycosylation of unprotected and unactivated pentoses. Even unreactive pentoses such as d-arabinose or d-lyxose can be transformed by this new methodology into corresponding isopropyl glycosides.