Antisense Oligonucleotides Internally Labeled with Peptides Show Improved Target Recognition and Stability to Enzymatic Degradation

Research output: Contribution to journalJournal article – Annual report year: 2017Researchpeer-review

Without internal affiliation

  • Author: Taskova, Maria

    University of Southern Denmark, Denmark

  • Author: Madsen, Charlotte S.

    University of Copenhagen, Denmark

  • Author: Jensen, Knud Jørgen

    University of Copenhagen, Denmark

  • Author: Hansen, Lykke Haastrup

    University of Southern Denmark, Denmark

  • Author: Vester, Birte

    University of Southern Denmark, Denmark

  • Author: Astakhova, Kira

    University of Southern Denmark

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Specific target binding and stability in diverse biological media is of crucial importance for applications of synthetic oligonucleotides as diagnostic and therapeutic tools. So far, these issues have been addressed by chemical modification of oligonucleotides and by conjugation with a peptide, most often at the terminal position of the oligonucleotide. Herein, we for the first time systematically investigate the influence of internally attached short peptides on the properties of antisense oligonucleotides. We report the synthesis and internal double labeling of 21-mer oligonucleotides that target the BRAF V600E oncogene, with a library of rationally designed peptides employing CuAAC "click" chemistry. The peptide sequence has an influence on the specificity and affinity of target DNA/RNA binding. We also investigated the impact of locked nucleic acids (LNAs) on the latter. Lysine residues improve binding of POCs to target DNA and RNA, whereas the distance to lysine correlates exclusively with a decrease in binding of mismatched RNA targets. Glycine and tyrosine residues affect target binding as well. Importantly, the resistance of POCs to enzymatic degradation is dramatically improved by the internal attachment of peptides but not by LNA alone. Independently of the peptide sequence, the conjugates are stable for up to 24 h in 90% human serum and duplexes of POCs with complementary DNA for up to 160 h in 90% human serum. Such excellent stability has not been previously reported for DNA and makes internally labeled POCs an exciting object of study, i.e., showing high target specificity and simultaneous stability in biological media.
Original languageEnglish
JournalBioconjugate Chemistry
Issue number3
Pages (from-to)768-774
Number of pages7
Publication statusPublished - 2017
Externally publishedYes
CitationsWeb of Science® Times Cited: No match on DOI
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ID: 143657882