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Abstract
The intracellular levels of the Escherichia coli RecBCD proteins have been amplified by fusing the recBCD genes to the strong tac promoter/operator in the expression vector, pKK223-3. The overproduced proteins occur at levels amounting to approx. 10% of total cellular protein. Strains harbouring these overexpression plasmids have been used to purify the RecB, RecC and RecD protein subunits, as well as the RecBCD holoenzyme. The individually purified protein subunits can be used to reconstitute the ATP-dependent DNase activity of the RecBCD enzyme.
Published Version
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