Journal
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
Volume 29, Issue 5, Pages 740-743Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmcl.2019.01.002
Keywords
Nucleic acids; Double-headed nucleotides; Oligonucleotides; Duplex; Triplex
Categories
Funding
- Independent Research Fund Denmark \ Natural Sciences
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Double-headed nucleotide monomers are capable of condensing the genetic information of DNA. Herein, a double-headed nucleotide with two cytosine bases (C-c) is constructed. The additional cytosine is connected through a methylene linker to the 2'-position of arabinocytidine. The nucleotide is incorporated into oligonucleotides and its effect on duplex stability is studied. For single incorporations, a thermal stabilization of 4.0 degrees C is found as compared to the unmodified duplex and it is shown that both nucleobases of C-c participate in Watson-Crick base pairing. In combination with the previously published UT monomer, it is also shown that multiple incorporations are tolerated. For instance, a 16-mer sequence is targeted by a 13-mer oligonucleotide by using one C-c and two U-T monomers without compromising the overall duplex stability. Finally, the potential of double-headed nucleotides in triplex-forming oligonucleotides is studied, however, with the conclusion that the present design is not well-suited for this function.
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