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Nucleoside Triphosphates - From Synthesis to Biochemical Characterization
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Pd(2+)-mediated base pairing in oligonucleotides.

Oleg Golubev1, Guillaume Turc2, Tuomas Lönnberg1

  • 1Department of Chemistry, University of Turku, Vatselankatu 2, FIN-20014 Turku, Finland.

Journal of Inorganic Biochemistry
|November 26, 2015
PubMed
Summary
This summary is machine-generated.

Palladium(2+) chelates in glycol nucleic acid (GNA) oligonucleotides stabilize duplexes when at termini, forming novel base pairs. Intrachain placement or in situ addition of palladium(2+) did not yield stabilization, unlike more labile metal ions.

Keywords:
Base pairingHybridizationOligonucleotidePd complexes

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Area of Science:

  • Synthetic chemistry
  • Oligonucleotide chemistry
  • Bioinorganic chemistry

Background:

  • Glycol nucleic acid (GNA) is a nucleic acid analog with potential applications in biotechnology.
  • Metal ions can mediate base pairing in nucleic acids, influencing their stability and function.
  • Previous attempts to incorporate palladium(2+) into oligonucleotides for base pairing have faced challenges.

Purpose of the Study:

  • To synthesize GNA oligonucleotides modified with a palladium(2+) chelate.
  • To investigate the hybridization properties and duplex stabilization of these modified GNAs.
  • To understand the role of palladium(2+) chelate placement (terminal vs. intrachain) on GNA duplex stability.

Main Methods:

  • Synthesis of GNA oligonucleotides with terminal or intrachain pyridine-2,6-dicarboxamide Pd(2+) chelates.
  • Melting temperature (Tm) measurements to assess hybridization and duplex stability.
  • Comparison of Tm values for modified vs. unmodified GNA duplexes.

Main Results:

  • Terminal Pd(2+) chelates significantly stabilized GNA duplexes, suggesting the formation of Pd(2+)-mediated base pairs.
  • Intrachain placement of the Pd(2+) chelate did not result in duplex stabilization.
  • Stabilization was only observed with pre-synthesized and purified palladated oligonucleotides, not with in situ addition of Pd(2+) salts.

Conclusions:

  • Pd(2+)-mediated base pairing is feasible in GNA, but only when the chelate is positioned at the termini of the duplex.
  • The slow ligand-exchange kinetics of Pd(2+) likely explains the lack of stabilization with intrachain placement and in situ addition.
  • These findings provide insights into the successful incorporation of Pd(2+)-mediated base pairs into oligonucleotides and address previous failures.