Search for dissertations about: "aza-ENA"

Found 4 swedish dissertations containing the word aza-ENA.

2. 1. Conformationally Constrained Nucleosides, Nucleotides and Oligonucleotides : Design, Synthesis and Properties

   Author : Dmytro Honcharenko; Jyoti Chattopadhyaya; Piet Herdewijn; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Bioorganic chemistry; antisense oligonucleotides; conformationally constrained nucleosides; azetidine; aza-ENA; target affinity; RNase H; exonuclease stability; pyrene-functionalized nucleotides; fluorescence; mismatch discrimination; Bioorganisk kemi; Cell and molecular biology; Cell- och molekylärbiologi;

   Abstract : This thesis is based on six original research publications describing synthesis, structure and physicochemical and biochemical analysis of chemically modified oligonucleotides (ONs) in terms of their potential diagnostic and therapeutic applications. Synthesis of two types of bicyclic conformationally constrained nucleosides, North-East locked 1',2'-azetidine and North locked 2',4'-aza-ENA, is described. READ MORE

4. 2. Conformationally Constrained Nucleosides : Design, Synthesis, and Biochemical Evaluation of Modified Antisense Oligonucleotides

   Author : Oommen P. Varghese; Lars Engman; Jacek Stawinski; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Organic chemistry; chemically modified oligonucleotides; azetidine; aza-ENA-T; cyanomethylene locked; free energy of activation; diaxial interactions; chair conformation; stable duplex; human serum; snake venom phosphodiesterase; antisense agents; RNase H; Organisk kemi; Chemistry; Kemi;

   Abstract : This thesis is concerned with synthesis, structure and biochemical analysis of chemically modified oligonucleotides with potential therapeutic applications. The three types of chemical modifications described here are: (a) A North-East locked 1',2'-azetidine nucleoside (b) A North locked 2',4'-cyanomethylene bridged nucleoside and (c) A 2',4'-aza-ENA-T nucleoside. READ MORE

5. 3. Targeting RNA by the Antisense Approach and a Close Look at RNA Cleavage Reaction

   Author : Jharna Barman; Lars Baltzer; Roger Strömberg; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Organic chemistry; mRNA targeting; antisense oligonucleotides; target affinity; RNase H; Michaelis-Menten kinetics; exo-nuclease stability; NMR; pH titration; alkaline hydrolysis; Organisk kemi;

   Abstract : This thesis summarizes the results of studies on two aspects of nucleic acids. Chemically modified antisense oligonucleotides (AONs) have been evaluated with regards to their suitability for mRNA targeting in an antisense approach (Paper I – III). READ MORE

6. 4. Structural and Biophysical Studies of Nucleic Acids

   Author : Wimal Pathmasiri; Adolf Gogoll; Lena Mäler; Uppsala universitet; []
   Keywords : Organic chemistry; nucleic acids; Nuclear Magnetic Resonance; molecular dynamics; sugar modified nucleosides; pKa; Organisk kemi;

   Abstract : This thesis is based on six research publications concerned with (i) study of the molecular structures and dynamics of modified nucleosides; (ii) investigation of the effect of incorporation of modified nucleosides on the structure of DNA; (iii) examination of the effect of the sugar modifications on the pseudo-aromatic properties (pKa) of the nucleobases; (iv) analysis of the effect of the CH-π interactions on the relative stability of the DNA-RNA hybrid duplexes. The structural stability of the nucleic acids as well as their behavior in molecular recognition is dominated by hydrogen bonding and stacking interactions beside other non-covalent interactions. READ MORE