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. 1986 Mar;57(3):883–892. doi: 10.1128/jvi.57.3.883-892.1986

Functional characterization of thermolabile DNA-binding proteins that affect adenovirus DNA replication.

G Prelich, B W Stillman
PMCID: PMC252818  PMID: 2936900

Abstract

The human adenovirus type 2 (Ad2) mutant Ad2ts111 has previously been shown to contain two mutations which result in a complex phenotype. Ad2ts111 contains a single base change in the early region 1B (E1B) 19,000-molecular-weight (19K) coding region which yields a cyt deg phenotype and another defect which maps to the E2A 72K DNA-binding protein (DBP) coding region that causes a temperature-sensitive DNA replication phenotype. Here we report that the defect in the Ad2ts111 DBP is due to a single G----T transversion that results in a substitution of valine for glycine at amino acid 280. A temperature-independent revertant, Ad2ts111R10, was isolated, which reverts back to glycine at amino acid 280 yet retains the cyt and deg phenotypes caused by the 19K mutation. We physically separated the two mutations of Ad2ts111 by constructing a recombinant virus, Ad2ts111A, which contained a wild-type Ad2 E1B 19K gene and the gly----val mutation in the 72K gene. Ad2ts111A was cyt+ deg+, yet it was still defective for DNA replication at the nonpermissive temperature. The Ad2ts111 DBP mutation is located only two amino acids away from the site of the mutation in Ad2+ND1ts23, a previously sequenced DBP mutant. Biochemical studies of purified Ad2+ND1ts23 DBP showed that this protein was defective for elongation but not initiation of replication in a cell-free replication system consisting of purified Ad polymerase, terminal protein precursor, and nuclear factor I. Ad2+ND1ts23 DBP bound less tightly to single-strand DNA than did Ad2 DBP, as shown by salt gradient elution of purified DBPs from denatured DNA cellulose columns. This decreased binding to DNA was probably due to local conformational changes in the protein at a site that is critical for DNA binding rather than to global changes in protein structure, since both the Ad2+ND1ts23 and Ad2 DBPs showed identical cleavage patterns by the protease thermolysin at various temperatures.

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