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Gene. 1995 Jun 9;158(2):241-6.

Production of active mouse DNA polymerase delta in bacteria.

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Institut für Veterinärbiochemie, Universität Zürich-Irchel, Switzerland.


The entire cDNA encoding the large subunit of mouse DNA polymerase delta (mPol delta; EC has been cloned and expressed in various bacterial expression systems. A soluble protein could only be obtained when mPol delta was produced as a glutathione S-transferase (GST) fusion protein and the incubation temperature of the expression strain was reduced to 30 degrees C. After purification over a glutathione-Sepharose column, the fractions containing the recombinant (re-) fusion protein showed both DNA Pol and 3'-->5' Exo activities. In situ activity gel analysis indicated that the Pol activity resides in the re-protein. This activity, however, was not stimulated by proliferating cell nuclear antigen (PCNA). Our data are discussed in the view of the findings of Goulian et al. [J. Biol. Chem., 265 (1990) 16402-16411] that the second mPol delta subunit, the 48-kDa protein, might play an important role in DNA Pol delta-PCNA interaction.

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