Abstract
With a predicted molecular mass of 469kDa, expression of recombinant DNA-dependent protein kinase catalytic subunit (DNA-PKcs) is challenging. However, DNA-PKcs is relatively abundant in human cells, making it possible to purify the endogenous protein. Here we describe a method to purify DNA-PKcs and its binding partner Ku70/80 from HeLa cells and describe conditions for transfer of DNA-PKcs and other large polypeptides for immunoblotting.
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