Phosphonate analogues of dinucleotides as substrates for DNA-dependent RNA polymerase from Escherichia coli in primed abortive initiation reaction

Alěs Cvekl, Květa Horská, Karel Sěbesta, Ivan Rosenberg, Antoním Holý

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2 Scopus citations


Dinucleotides (3′-5′)-ApU and UpA and their 3′-O-phosphonylmethyl and 5′-O-phosphonylmethyl analogues were studied as substrates in the primed abortive synthesis catalysed by Escherichia coli DNA-dependent RNA polymerase on poly[d(A-T)] template. All phosphonate analogues of dinucleotides containing the anomalous sugar-phosphate backbone are substrates for the holoenzyme as verified by RNase A and RNase T2 digestion of the trinucleotide analogues obtained. The finding that phosphonate dinucleotides act as primers for transcription indicates that steric requirements at the initiation site are not as specific as previously supposed. Analysis of kinetic constants of ordered bibi reaction Kia, KmA, KmB and Vmax suggests that the instability of short RNA-DNA hybrids contributes to the abortive release of trinucleotides formed.

Original languageEnglish (US)
Pages (from-to)33-38
Number of pages6
JournalInternational Journal of Biological Macromolecules
Issue number1
Publication statusPublished - Feb 1989
Externally publishedYes



  • RNA polymerase
  • phosphonate dinucleotide
  • transcription

ASJC Scopus subject areas

  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Economics and Econometrics
  • Energy(all)

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