We are analyzing https://link.springer.com/article/10.1007/bf02738118.

Title:
Exonucleases and the incorporation of aranucleotides into DNA | Cell Biochemistry and Biophysics
Description:
The polymerization of nucleotide analogs into DNA is a common strategy used to inhibit DNA synthesis in rapidly dividing tumor cells and viruses. The mammalian DNA polymerases catalyze the insertion of the arabinofuranosyl analogs of dNTPs (aranucleotides) into DNA efficiently, but elongate from the 3′ aranucleotides poorly. Slow elongation provides an opportunity for exonucleases to remove aranucleotides. The exonuclease activity associated with DNA polymerase δ removes araCMP from 3′ termini with the same efficiency that it removes a paired 3′ deoxycytosine suggesting that the proofreading exonucleases associated with DNA polymerases might remove aranucleotides inefficiently. A separate 30 kDa exonuclease has been purified from mammalian cells that removes araCMP from 3′ termini. The activity of this enzyme in the cell could remove aranucleotides from 3′ termini of DNA and decrease the efficacy of the analogs. Inhibition analysis of the purified exonuclease shows that this enzyme is inhibited by thioinosine monophosphate (TIMP) with aK i=17 μM. When high TIMP levels are generated in HL-60 cells, incorporation of araC in DNA is increased about 16-fold relative to total DNA synthesis. This increased araC in DNA is likely a result of exonuclease inhibition in the cell. Thus, exonucleases in cells might play an important role in removing aranucleotides inserted by DNA polymerases.
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Topics {✒️}

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