DNA Polymerase-associated and autonomous vertebrate 3′→5′ exonuleases

  • N. L. Ronzhina
  • T. P. Kravetskaya
  • V. M. Krutyakov
Comparative and Ontogenic Biochemistry


Using methods of gel filtration and ultracentrifugation, cell-free extracts from 12 objects representing the main vertebrate representatives (bony fish, amphibian, reptiles, birds, mammals, including human) were studied. The enzyme activity of autonomous 3′→5′-exonucleases (AE) has been established to be 25–90% of the total 3′→5′ exonuclease activity of the extracts. A part of the AE is revealed in a zone of the DNA polymerases of the α-family and can be separated by changing Chromatographic conditions or by repeated fractionation. The high activity of AE allows suggesting their substantial participation in the replicative correction of the DNA-poly-merase errors as well as in the postreplicative correction of the heteroduplexes in the vertebrate DNA.


Evolutionary Biochemistry Nuclease Activity Exonuclease Activity Repeated Chromatography Substantial Participation 


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© MAIK “Nauka/Interperiodica” 2000

Authors and Affiliations

  • N. L. Ronzhina
    • 1
  • T. P. Kravetskaya
    • 1
  • V. M. Krutyakov
    • 1
  1. 1.Laboratory of DNA Synthesis, Department of Molecular and Radiation Biophysics, St. Petersburg Institute of Nuclear PhysicsRussian Academy of SciencesGatchinaRussia

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