Abstract
We have previously demonstrated that the Escherichia coli strain mutS ΔpolA had a higher rate of transition and minus frameshift mutations than mutS or ΔpolA strains. We argued that DNA polymerase I (PolI) corrects transition mismatches. PolI, encoded by the polA gene, possesses Klenow and 5´ → 3´ exonuclease domains. In the present study, rates of mutation were found to be higher in Klenow-defective mutS strains and 5´ → 3´ exonuclease-defective mutS strains than mutS or polA strains. The Klenow-defective or 5´ → 3´ exonuclease-defective mutS strains showed a marked increase in transition mutations. Sites of transition mutations in mutS, Klenow-defective mutS and 5´ → 3´ exonuclease-defective mutS strains are different. Thus, it is suggested that, in addition to mutS function, both the Klenow and 5´ → 3´ exonuclease domains are involved in the decrease of transition mutations. Transition hot and warm spots in mutS + polA + strains were found to differ from those in mutS and mutS ΔpolA strains. We thus argue that all the spontaneous transition mutations in the wild-type strain do not arise from transition mismatches left unrepaired by the MutS system or MutS PolI system.

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The research was sponsored by a Grant-in-aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan
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Communicated by A. Aguilera.
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Imai, M., Tago, Yi., Ihara, M. et al. Role of the 5´ → 3´ exonuclease and Klenow fragment of Escherichia coli DNA polymerase I in base mismatch repair. Mol Genet Genomics 278, 211–220 (2007). https://doi.org/10.1007/s00438-007-0239-8
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DOI: https://doi.org/10.1007/s00438-007-0239-8

