Effect of SOS-induced Pol II, Pol IV, and Pol V DNA polymerases on UV-induced mutagenesis and MFD repair in Escherichia coli cells.

• Authors: Michał Wrzesiński , Anetta Nowosielska , Jadwiga Nieminuszczy , Elżbieta Grzesiuk
• Languages of publication: EN

Abstracts

EN

Irradiation of organisms with UV light produces genotoxic and mutagenic lesions in DNA. Replication through these lesions (translesion DNA synthesis, TSL) in Escherichia coli requires polymerase V (Pol V) and polymerase III (Pol III) holoenzyme. However, some evidence indicates that in the absence of Pol V, and with Pol III inactivated in its proofreading activity by the mutD5 mutation, efficient TSL takes place. The aim of this work was to estimate the involvement of SOS-inducible DNA polymerases, Pol II, Pol IV and Pol V, in UV mutagenesis and in mutation frequency decline (MFD), a mechanism of repair of UV-induced damage to DNA under conditions of arrested protein synthesis. Using the argE3→Arg+ reversion to prototrophy system in E. coli AB1157, we found that the umuDC-encoded Pol V is the only SOS-inducible polymerase required for UV mutagenesis, since in its absence the level of Arg+ revertants is extremely low and independent of Pol II and/or Pol IV. The low level of UV-induced Arg+ revertants observed in the AB1157mutD5ΔumuDC strain indicates that under conditions of disturbed proofreading activity of Pol III and lack of Pol V, UV-induced lesions are bypassed without inducing mutations. The presented results also indicate that Pol V may provide substrates for MFD repair; moreover, we suggest that only those DNA lesions which result from umuDC-directed UV mutagenesis are subject to MFD repair.

Keywords

EN

MFD; polB; UV induced mutagenesis; E. coli; dinB; mutD5; umuDC

• Publisher: Polish Biochemical Society
• Journal: Acta Biochimica Polonica
• Year: 2005
• Volume: 52
• Issue: 1
• Pages: 139-147

Dates

published

2005

received

2004-12-29

accepted

2005-03-12

Contributors

author

Michał Wrzesiński

• Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warszawa, Poland

author

Anetta Nowosielska

• Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warszawa, Poland

author

Jadwiga Nieminuszczy

• Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warszawa, Poland

author

Elżbieta Grzesiuk

• Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warszawa, Poland

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