Abstract
A soluble adenovirus DNA replication system was prepared in extracts of [human cervical carcinoma] HeLa cells infected with the temperature-sensitive mutant H5ts125. These nuclear extracts synthesize full-sized viral DNA at 30.degree. C but are temperature sensitive in this function at 38.degree. C. A 72,000 dalton DNA-binding protein purified from cells infected with wild-type virus complements the temperature-sensitive defect and restores viral DNA replication to 74% of normal values.