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. 1986 May;6(5):1363–1373. doi: 10.1128/mcb.6.5.1363

Purification of a cellular, double-stranded DNA-binding protein required for initiation of adenovirus DNA replication by using a rapid filter-binding assay.

J F Diffley, B Stillman
PMCID: PMC367659  PMID: 3785168

Abstract

A rapid and quantitative nitrocellulose filter-binding assay is described for the detection of nuclear factor I, a HeLa cell sequence-specific DNA-binding protein required for the initiation of adenovirus DNA replication. In this assay, the abundant nonspecific DNA-binding activity present in unfractionated HeLa nuclear extracts was greatly reduced by preincubation of these extracts with a homopolymeric competitor DNA. Subsequently, specific DNA-binding activity was detected as the preferential retention of a labeled 48-base-pair DNA fragment containing a functional nuclear factor I binding site compared with a control DNA fragment to which nuclear factor I did not bind specifically. This specific DNA-binding activity was shown to be both quantitative and time dependent. Furthermore, the conditions of this assay allowed footprinting of nuclear factor I in unfractionated HeLa nuclear extracts and quantitative detection of the protein during purification. Using unfrozen HeLa cells and reagents known to limit endogenous proteolysis, nuclear factor I was purified to near homogeneity from HeLa nuclear extracts by a combination of standard chromatography and specific DNA affinity chromatography. Over a 400-fold purification of nuclear factor I, on the basis of the specific activity of both sequence-specific DNA binding and complementation of adenovirus DNA replication in vitro, was affected by this purification. The most highly purified fraction was greatly enriched for a polypeptide of 160 kilodaltons on silver-stained sodium dodecyl sulfate-polyacrylamide gels. Furthermore, this protein cosedimented with specific DNA-binding activity on glycerol gradients. That this fraction indeed contained nuclear factor I was demonstrated by both DNase I footprinting and its function in the initiation of adenovirus DNA replication. Finally, the stoichiometry of specific DNA binding by nuclear factor I is shown to be most consistent with 2 mol of the 160-kilodalton polypeptide binding per mol of nuclear factor I-binding site.

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