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Base excision repair enzyme endonuclease III suppresses mutagenesis caused by 8-hydroxy-dGTP

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Title: Base excision repair enzyme endonuclease III suppresses mutagenesis caused by 8-hydroxy-dGTP
Authors: Suzuki, Tetsuya Browse this author
Yamamoto, Kazuo Browse this author
Harashima, Hideyoshi Browse this author
Kamiya, Hiroyuki Browse this author
Keywords: Base excision repair
Issue Date: 1-Jan-2008
Publisher: Elsevier
Journal Title: DNA Repair
Volume: 7
Issue: 1
Start Page: 88
End Page: 94
Publisher DOI: 10.1016/j.dnarep.2007.08.003
Abstract: To examine whether base excision repair suppresses mutations induced by oxidized deoxyribonucleotide 5′-triphosphates in the nucleotide pool, 8-hydroxy-dGTP (8-OH-dGTP) and 2-hydroxy-dATP were introduced into Escherichia coli strains deficient in endonucleases III (Nth) and VIII (Nei) and MutY, and mutations in the chromosomal rpoB gene were analyzed. The spontaneous rpoB mutant frequency was also examined in mutT/nth and mutT/nei strains, to assess the influence on the mutations induced by the endogenous 8-OH-dGTP accumulated in the mutT mutant. The mutations induced by exogenous 2-hydroxy-dATP were similar in all of the strains tested. Exogenous 8-OH-dGTP increased the rpoB mutant frequency more efficiently in the nth strain than that in the wild-type strain. The spontaneous mutant frequency in the mutT/nth strain was 2-fold higher than that in the mutT strain. These results suggest that E. coli endonuclease III also acts as a defense against the mutations caused by 8-OH-dGTP in the nucleotide pool.
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Type: article (author version)
Appears in Collections:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 紙谷 浩之


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