Adenovirus DNA-protein complex purified by sedimentation on a sucrose gradient containing 4 -guanidine hydrochloride was found to contain other virion proteins in addition to the terminal protein of mol. wt. 55000. In this report, we describe a simple and rapid method for the isolation of a homogeneous DNA-protein complex. The procedure involves gel electrophoresis of the complex on agarose in the presence of sodium dodecyl sulphate. DNA was found to migrate into the gel with a single protein of mol. wt. 55000 tightly attached to it. Restriction enzyme cleavage analysis of the DNA-protein complex shows that the protein is associated with the two terminal fragments.


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