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Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Nonenzymatic template-directed synthesis on oligodeoxycytidylate sequences in hairpin oligonucleotides.
We have developed a novel method for studying template-directed synthesis in hairpin oligonucleotides. An unpaired segment at the 5'-terminus of the hairpin acts as an intramolecular template for the extension of the paired 3'-terminus. Products are analyzed by denaturing gel electrophoresis of [32P]-labeled hairpins. Using this system, we have studied the synthesis of oligoguanylates on an oligodeoxycytidylate template. We find that guanosine 5'-phosphoro(2-methyl)imidazolide adds efficiently to a terminal riboguanylate residue at temperatures in the range 0-37 degrees C but not at 50 degrees C. At 0 degree C, the half-time for addition of the first G residue is about 3 h, and the reaction rate is independent of pH in the range 6.5-8.0. The first addition reaction results in the formation of a predominantly 3'-5'-internucleotide bond. When the 3'-terminal riboguanylate residue is placed by a deoxyguanylate residue, the half-time for the first addition increases from about 3 to about 30 h.
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