Quantitative measurements on the duplex stability of 2,6‐diaminopurine and 5‐chloro‐uracil nucleotides using enzymatically synthesized oligomers
- 12 November 1990
- journal article
- Published by Wiley in FEBS Letters
- Vol. 274 (1-2) , 103-106
- https://doi.org/10.1016/0014-5793(90)81340-t
Abstract
2,6-Diaminopurine and 5-chloro-uracil 2'-deoxynucleoside 5'-triphosphates were synthesized from their 2'-deoxynucleosides. Using a method of creating oligonucleotides by enzymatic primer extension, dodecanucleotides representing an XbaI/SalI site and the complementary SalI/XbaI site were generated containing these base modifications. Their duplex stability was quantitatively compared by thin-layer chromatography to oligomers containing 2'-deoxyadenosine and 2'-deoxythymidine. The two unmodified oligomers already showed significant differences in dissociation temperature and binding equilibrium. Substitution with 5-chloro-2'-deoxyuridine did not affect the dissociation temperature of either oligomer, the 2,6-diaminopurine, however, led to an increase of 1.8°C or 1.5°C per modified base, respectively. While in the XbaI/SalI oligomer both base modifications changed the binding equilibrium, the 2,6-diaminopurine by a factor of 1.32, the 5-chloro-uracil by 0.65, no such effect was found with the complementary oligomerKeywords
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