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We have compared a series of molecular constructs that contain the minimal DNA-binding and dimerization domain of bovine papillomavirus type 1 (BPV-1) E2 alone or this binding domain plus the adjacent 16 or 40 amino acids to test the role of the flanking sequences in E2 function. The presence of these sequences resulted in an up to eightfold increase in the affinity of E2 for its target DNA and stabilized the protein against denaturation both in the absence of DNA and in the form of DNA-protein complexes. In addition, an aspartic acid-to-tyrosine mutation within the flanking region blocked DNA binding and function. These data demonstrate that sequences flanking the core domain contribute to E2 function and are, in fact, an integral part of the DNA-binding domain of BPV-1 E2.

Sequences flanking the core DNA-binding domain of bovine papillomavirus type 1 E2 contribute to DNA-binding function