Tricyclic nitrogen base 1,N6-ethenoadenine and its ribosides as substrates for purine-nucleoside phosphorylases: Spectroscopic and kinetic studies

Nucleosides Nucleotides Nucleic Acids. 2018 Feb 1;37(2):89-101. doi: 10.1080/15257770.2017.1419255. Epub 2018 Jan 29.

Abstract

The title compound is an excellent substrate for E. coli PNP, as well as for its D204N mutant. The main product of the synthetic reaction is N9-riboside, but some amount of N7-riboside is also present. Surprisingly, 1,N6-ethenoadenine is also ribosylated by both wild-type and mutated (N243D) forms of calf PNP, which catalyze the synthesis of a different riboside, tentatively identified as N6-β-D-ribosyl-1,N6-ethenoadenine. All ribosides are susceptible to phosphorolysis by the E. coli PNP (wild type). All the ribosides are fluorescent and can be utilized as analytical probes.

Keywords: ethenoadenine; ethenoadenosine; fluorescent base analogs; nucleoside synthesis; purine-nucleoside phosphorylase.

MeSH terms

  • Adenine / analogs & derivatives*
  • Adenine / chemical synthesis
  • Adenine / chemistry
  • Biocatalysis
  • Escherichia coli Proteins / chemistry*
  • Kinetics
  • Molecular Structure
  • Mutation
  • Purine Nucleosides / chemical synthesis*
  • Purine Nucleosides / chemistry
  • Purine-Nucleoside Phosphorylase / chemistry*
  • Spectrometry, Fluorescence

Substances

  • Escherichia coli Proteins
  • Purine Nucleosides
  • 1,N(6)-ethenoadenine
  • Purine-Nucleoside Phosphorylase
  • Adenine