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Molecular Biology

, Volume 39, Issue 3, pp 430–437 | Cite as

Computer Analysis of Conformational and Physicochemical Properties of Nucleotide Sequences Cleavable by DNA Topoisomerase I

  • D. Yu. Oshchepkov
  • D. V. Bugreev
  • N. A. Kolchanov
  • G. A. Nevinsky
Molecular Mechanisms of Biological Processes

Abstract

DNA binding with enzymes is followed by specific adaptation of the DNA structure, including partial or almost complete melting, structural changes in the sugar-phosphate backbone, stretching, compressing, bending or kinking, base flipping, etc. The set of conformational changes is individual for each enzyme and is aimed at efficiently adjusting the orbitals of the reacting groups of the enzyme and the specific DNA site to 10°–15°. The efficiency of nucleotide sequence adaptation determined by the enzyme depends on several structural characteristics. Optimal adjustment is achieved only in the case of specific DNA sequences; as a result, the reaction rate is four to eight orders of magnitude higher with specific than with nonspecific sequences. DNA topoisomerase I (Topo) is a sequence-dependent enzyme. Although less efficiently, Topo cleaves sequences which differ considerably from the optimal sequence. A method based on the analysis of conformational and physicochemical properties of the DNA helix was used to examine many nucleotide sequences cleavable by Topo. The method yields detailed information on similarity or difference of DNA structural units. The cleavable sequences proved to be similar in roll, slide, twist, and rise. In addition, all sequences had sterically disadvantageous contacts between N3 and NH2 of guanines and N3 of adenines in the minor groove, which corresponded to the presence of dinucleotides Py-Pu in the cleavage site. DNA bending towards the major groove is easier in the case of the optimal sequence. This method is promising for analyzing the efficiency of nucleic acid cleavage by various DNA- and RNA-dependent enzymes.

Key words

DNA topoisomerase I DNA cleavage specificity cleavable sequences structural peculiarities 

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Copyright information

© MAIK “Nauka/Interperiodica” 2005

Authors and Affiliations

  • D. Yu. Oshchepkov
    • 1
  • D. V. Bugreev
    • 2
  • N. A. Kolchanov
    • 1
  • G. A. Nevinsky
    • 2
  1. 1.Institute of Cytology and GeneticsSiberian Division, Russian Academy of SciencesNovosibirskRussia
  2. 2.Institute of Chemical Biology and Fundamental MedicineSiberian Division, Russian Academy of SciencesNovosibirskRussia

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