Synthesis of 20,40-Propylene-Bridged (Carba-ENA) Thymidine and Its Analogues: The Engineering of Electrostatic and Steric Effects at the Bottom of theMinor Groove for Nuclease and Thermodynamic Stabilities and Elicitation of RNase H
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Fine tuning of electrostatics around the internucleotidic phosphate through incorporation of modified 2',4'-carbocyclic-LNAs and -ENAs leads to significant modulation of antisense properties.
In the antisense (AS) and RNA interference (RNAi) technologies, the native single-stranded 2'-deoxyoligonucleotides (for AS) or double-stranded RNA (for RNAi) are chemically modified to bind to the target RNA in order to give improved downregulation of gene expression through inhibition of RNA translation. It is shown here how the fine adjustment of the electrostatic interaction by alteration o...
متن کاملSynthesis, RNA selective hybridization and high nuclease resistance of an oligonucleotide containing novel bridged nucleic acid with cyclic urea structurew
Since the Human Genome Project was completed, much attention has been given to genome technologies to regulate target gene expression or function. The most simple and promising approach to down-regulate target gene expression in a living cell is antisense strategy, which prevents translation by hybridization of an oligonucleotide with its complementary RNA strand. For practical use in antisense...
متن کاملAb initio Study and NBO Analysis of Conformational Properties of 2-Substituted Cyclohexane-1,3-diones and its Analogues Containing S and Se Atoms
NBO analysis, hybrid density functional theory (B3LYP/6-311+G**) and ab initio molecular orbital (HF/6-311+G**) based methods were used to study the anomeric effects (AE), electrostatic interactions, dipole-dipole interactions and steric repulsion effects on the conformational properties of 2-methoxy- (1), 2-methylthio- (2), 2-methylseleno- (3), 2-fluoro- (4), 2-chloro- (5) and 2-bromocyclohexa...
متن کاملAb initio Study and NBO Analysis of Conformational Properties of 2-Substituted Cyclohexane-1,3-diones and its Analogues Containing S and Se Atoms
NBO analysis, hybrid density functional theory (B3LYP/6-311+G**) and ab initio molecular orbital (HF/6-311+G**) based methods were used to study the anomeric effects (AE), electrostatic interactions, dipole-dipole interactions and steric repulsion effects on the conformational properties of 2-methoxy- (1), 2-methylthio- (2), 2-methylseleno- (3), 2-fluoro- (4), 2-chloro- (5) and 2-bromocyclohexa...
متن کاملA Computational Study on the Configurational Behaviors of Dihalodiazenes and their Analogues Containing P and As Atoms
In this research, we report the results of DFT calculations using xc-hybrid functional, B3LYP and employ NBO interpretation to investigate the stereoelectronic effects. Electrostatic and steric impacts on the conformational properties of 1,2-difluorodiazene (1), 1,2-dichlorodiazene (2) and 1,2-dibromodiazene (3) are also studied. Factors determining the thermodynamically stable molecular struct...
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تاریخ انتشار 2010