Adenine Download high resolution version (1163x1429, 7 KB) Wikipedia does not have an article with this exact name. ... Adenine is one of the two purine nucleobases used in forming nucleotides of the nucleic acids DNA and RNA. In DNA, adenine (A) binds to thymine (T) via two hydrogen bonds to assist in stabilizing the nucleic acid structures. ...
Guanine Download high resolution version (1724x1429, 9 KB) Wikipedia does not have an article with this exact name. ... Guanine is one of the five main nucleobases found in nucleic acids (, DNA and RNA). ...
Download high resolution version (1269x1363, 6 KB) Wikipedia does not have an article with this exact name. ... Thymine, also known as 5-methyluracil, is a pyrimidine nucleobase. ... Download high resolution version (1014x1357, 5 KB) Wikipedia does not have an article with this exact name. ... Cytosine is one of the 5 main nucleobases used in storing and transporting genetic information within a cell in the nucleic acids DNA and RNA. It is a pyrimidine derivative, with a heterocyclic aromatic ring and two substituents attached (an amine group at position 4 and a keto group at...
Alternatively, interaction with a cationic nucleobase might activate the 2´ oxyanion nucleophile, or the nucleobase could act as a general acid to protonate the leaving group during the breaking of 5´ oxygen-phosphorus bonds (Fig.
A cationic nucleobase should contribute electrostatic stabilization to the transition state for both cleavage and ligation reactions, because the transition state is identical in forward and reverse reactions.
In contrast, a nucleobase that contributes general acid catalysis to the cleavage reaction should contribute general base catalysis to ligation as the 5´ oxygen becomes the nucleophile and the 2´ oxygen becomes the leaving group.
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