Abstract
Oxidized bases are removed from DNA of Escherichia coli by enzymes formamidopyrimidine DNA glycosylase (Eco-Fpg) and endonuclease VIII (Eco-Nei) of the same structural family Fpg/Nei. New homologs of these enzymes not characterized earlier have been found in genomes of Actinobacteria. We have cloned and expressed two paralogs (Mtu-Nei2 and Mtu-Fpg2) from 36KAZ and KHA94 isolates of Mycobacterium tuberculosis and studied their ability to participate in DNA repair. Under heterologous expression in E. coli, Mtu-Nei2 decreased the rate of spontaneous mutagenesis in the rpoB gene, whereas Mtu-Fpg2 moderately increased it, possibly due to absence of residues crucially important for catalysis in this protein. Mtu-Nei2 was highly active toward double-stranded DNA substrates containing dihydrouracil residues and apurine-apyrimidine sites and was less efficient in cleavage of substrates containing 8-oxoguanine and uracil residues. These lesions, as well as 8-oxoadenine residues, were also recognized and removed by the enzyme from single-stranded DNA. Fpg and Nei homologs from M. tuberculosis can play an important role in protection of bacteria against genotoxic stress caused by oxidative burst in macrophages.
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Abbreviations
- AP:
-
apurine-apyrimidine
- BER:
-
base excision repair
- DHU:
-
5,6-dihydrouracil
- ODN:
-
oligodeoxyribonucleotide
- 8-oxoG:
-
7,8-dihydro-8-oxoguanine
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Original Russian Text © V. S. Sidorenko, M. A. Rot, M. L. Filipenko, G. A. Nevinsky, D. O. Zharkov, 2008, published in Biokhimiya, 2008, Vol. 73, No. 4, pp. 542–552.
Originally published in Biochemistry (Moscow) On-Line Papers in Press, as Manuscript BM07-319, February 3, 2008.
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Sidorenko, V.S., Rot, M.A., Filipenko, M.L. et al. Novel DNA glycosylases from Mycobacterium tuberculosis . Biochemistry Moscow 73, 442–450 (2008). https://doi.org/10.1134/S0006297908040093
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DOI: https://doi.org/10.1134/S0006297908040093