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. 1990 Feb;64(2):630–638. doi: 10.1128/jvi.64.2.630-638.1990

Conserved region 3 of the adenovirus type 5 DNA-binding protein is important for interaction with single-stranded DNA.

G A Neale 1, G R Kitchingman 1
PMCID: PMC249153  PMID: 2296078

Abstract

The adenovirus-encoded single-stranded DNA-binding protein (DBP) functions in viral DNA replication and several aspects of RNA metabolism. Previous studies (G. A. M. Neale and G. R. Kitchingman, J. Biol. Chem. 264:3153-3159, 1989) have defined three highly conserved regions in the carboxy-terminal domain of the protein (amino acids 178 to 186, 322 to 330, and 464 to 475) that may be involved in the binding of the protein to single-stranded DNA. We examined the role of conserved region 3 (464 to 475) by constructing nine classes of point mutants with from one to four amino acid changes. The point mutants were tested for their ability to assist adeno-associated virus DNA replication. All nine differed from wild-type DBP; seven were essentially nonfunctional, whereas two had 55 and 145%, respectively, of the wild-type DBP helper activity. Three of the mutants were found to be temperature sensitive, with significantly greater helper activity at 33 degrees C than at 37 degrees C. All nine mutants produced essentially wild-type levels of protein. One monoclonal antibody against the DBP, termed 2/4, did not immunoprecipitate the mutant DBPs as well as wild-type DBP, indicating either that the antibody recognized sequences around CR3 or that the conformation of the protein around the epitope recognized by 2/4 had changed. Two of the three temperature-sensitive DBP mutants bound to single-stranded DNA-cellulose with the same affinity as wild-type DBP at 4 degrees C; the remaining mutants all showed reduced affinity. These results demonstrated that many of the residues within conserved region 3 of the DBP are important for interaction of the protein with nucleic acid.

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Selected References

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