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. 1983 Feb;80(4):935–939. doi: 10.1073/pnas.80.4.935

In vitro complementation as an assay for purification of adenovirus DNA replication proteins.

J M Ostrove, P Rosenfeld, J Williams, T J Kelly Jr
PMCID: PMC393502  PMID: 6573663

Abstract

As an approach to the purification of adenovirus-encoded DNA replication proteins, we have developed in vitro complementation assays that make use of viral mutants defective in DNA replication in vivo. Nuclear extracts prepared from cells infected with H5ts36 or H5ts125, two such mutants belonging to different complementation groups, were found to be defective in viral DNA replication in vitro. However, replication activity could be restored by mixing the two extracts. Replication activity in either extract also could be restored by addition of appropriate replication-deficient fractions purified from cells infected with wild-type adenovirus. By using such assays, H5ts36- and H5ts125-complementing activities were extensively purified. As expected, purified H5ts125-complementing activity consisted of a single major polypeptide, the 72-kilodalton (kDal) adenovirus DNA binding protein. The purified H5ts36-complementing activity consisted of the 80-kDal adenovirus terminal protein precursor and two other major polypeptides with apparent molecular masses of 140 and 65 kDal. Formation of the 80-kDal terminal protein-dCMP complexes, the proposed initial step in adenovirus DNA replication, required components in the purified H5ts36-complementing fraction and a cellular factor(s) but did not require the adenovirus DNA binding protein. The complete in vitro adenovirus DNA replication reaction was reconstituted from the purified H5ts36-complementing activity, the adenovirus DNA binding protein, and an extract from uninfected cells.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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