Nuclease resistance of an extraordinarily thermostable mini-hairpin DNA fragment, d(GCGAAGC) and its application toin vitroprotein synthesis
- 1 January 1994
- journal article
- Published by Oxford University Press (OUP) in Nucleic Acids Research
- Vol. 22 (12) , 2217-2221
- https://doi.org/10.1093/nar/22.12.2217
Abstract
The nuclease resistance of a short, thermostable mini-hairpin, d(GCGAAGC), and other related hairpins was examined. Hairpins possessing a purine-rich (GAA) or (GAAA) loop appeared to be more resistant against nucleases than those with a pyrimidine-rich loop or single-stranded oligomers. Among 8 kinds of oligodeoxyribonucleotides examined, the fragment most resistant against nucleases was a hairpin with the sequence of d(CGCGAAGCG). This hairpin was then utilized for the stabilization of mRNA in an in vitro translation system; the 3'-terminal region of an mRNA was hybridized with an oligodeoxyribonucleotide including the sequence complementary to the 3'-terminus of the mRNA tagged with the nuclease-resistant d(CGCGAAGCG) hairpin sequence. By using this method, dihydrofolate reductase (DHFR) mRNA was stabilized against nucleases contaminating a cell-free translation system of E.coli, with a consequent increase in protein synthesis efficiency of 200%.Keywords
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