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Keywords:

  • cross-coupling;
  • DNA;
  • electrochemistry;
  • ferrocene;
  • nucleotides;
  • polymerase

Abstract

Modified dATP (2′-deoxyadenosine-5′-triphosphate) and dUTP (2′-deoxyuridine-5′-triphosphate) bearing ferrocene (Fc) labels linked via a conjugate acetylene spacer were prepared by single-step aqueous-phase cross-coupling reactions of 7-iodo-7-deaza-dATP or 5-iodo-dUTP with ethynylferrocene. The Fc-labeled dNTPs were good substrates for DNA polymerases and were efficiently incorporated to DNA by primer extension (PEX). Electrochemical analysis of the 2′-deoxyribonucleoside triphosphates (dNTPs) and PEX products revealed significant differences in redox potentials of the Fc label bound either to U or to 7-deazaA and between isolated dNTPs and conjugates incorporated to DNA. Prospective bioanalytical applications are outlined.