The DnaE polymerase from Deinococcus radiodurans features RecA-dependent DNA polymerase activity.

Autor:	Randi L; Department of Pharmacy and Biotechnology, University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy., Perrone A; Department of Pharmacy and Biotechnology, University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy., Maturi M; Department of Pharmacy and Biotechnology, University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy., Dal Piaz F; Department of Medicine, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano SA, Italy., Camerani M; Department of Pharmacy and Biotechnology, University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy., Hochkoeppler A; Department of Pharmacy and Biotechnology, University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy a.hochkoeppler@unibo.it.; CSGI, University of Firenze, Via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy.
Jazyk:	angličtina
Zdroj:	Bioscience reports [Biosci Rep] 2016 Dec 05; Vol. 36 (6). Date of Electronic Publication: 2016 Dec 05 (Print Publication: 2016).
DOI:	10.1042/BSR20160364
Abstrakt:	We report in the present study on the catalytic properties of the Deinococcus radiodurans DNA polymerase III α subunit (αDr). The αDr enzyme was overexpressed in Escherichia coli, both in soluble form and as inclusion bodies. When purified from soluble protein extracts, αDr was found to be tightly associated with E. coli RNA polymerase, from which αDr could not be dissociated. On the contrary, when refolded from inclusion bodies, αDr was devoid of E. coli RNA polymerase and was purified to homogeneity. When assayed with different DNA substrates, αDr featured slower DNA extension rates when compared with the corresponding enzyme from E. coli (E. coli DNA Pol III, αEc), unless under high ionic strength conditions or in the presence of manganese. Further assays were performed using a ssDNA and a dsDNA, whose recombination yields a DNA substrate. Surprisingly, αDr was found to be incapable of recombination-dependent DNA polymerase activity, whereas αEc was competent in this action. However, in the presence of the RecA recombinase, αDr was able to efficiently extend the DNA substrate produced by recombination. Upon comparing the rates of RecA-dependent and RecA-independent DNA polymerase activities, we detected a significant activation of αDr by the recombinase. Conversely, the activity of αEc was found maximal under non-recombination conditions. Overall, our observations indicate a sharp contrast between the catalytic actions of αDr and αEc, with αDr more performing under recombination conditions, and αEc preferring DNA substrates whose extension does not require recombination events. (© 2016 The Author(s).)
Databáze:	MEDLINE
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