Interplay between replication and recombination in Escherichia coli: impact of the alternative DNA polymerases

Proceedings of the National Academy of Sciences of the United States of America
Stéphane Delmas, Ivan Matic

Abstract

Homologous recombination (HR) and translesion synthesis (TLS) are two pathways involved in the tolerance of lesions that block the replicative DNA polymerase. However, whereas TLS is frequently error-prone and, therefore, can be deleterious, HR is generally error-free. Furthermore, because the recombination enzymes and alternative DNA polymerases that perform TLS may use the same substrate, their coordination might be important to assure cell fitness and survival. This study aimed to determine whether and how these pathways are coordinated in Escherichia coli cells by using conjugational replication and recombination as a model system. The role of the three alternative DNA polymerases that are regulated by the SOS system was tested in DNA polymerase III holoenzyme-proficient and -deficient mutants. When PolIII is inactive, the alternative DNA polymerases copy DNA in the following order: PolII, PolIV, and PolV. The observed hierarchy corresponds to the selective constraints imposed on the genes coding for alternative DNA polymerases observed in natural populations of E. coli, suggesting that this hierarchy depends on the frequency of specific damages encountered during the evolutionary history of E. coli. We also found that DNA ...Continue Reading

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Jun 16, 2009·Proceedings of the National Academy of Sciences of the United States of America·Sanna Koskiniemi, Dan I Andersson
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