title: Interference with protein binding at AP2 sites by sequence-specific methylation in the late E2A promoter of adenovirus type 2 DNA.
abstract: The in vitro methylation of the +6, +24, and -215 located 5'-CCGG-3' sequences in the late E2A promoter of adenovirus type 2 (Ad2) DNA abrogates promoter function. 5-Methyldeoxycytidine (5-mC) at positions +6 and +24 in both or either of the two DNA complements in the late E2A promoter abolishes the formation of a high-molecular-mass DNA-protein complex that is essential for promoter function. The formation of this complex can be competed for by an oligodeoxyribonucleotide with a consensus AP2 sequence, but not by AP1, AP3, or CREB sequences. The AP2 sites comprise the +6 and +24 located 5'-CCGG-3' sequences in the late E2A promoter; the AP1, AP3 and CREB sequences are in their immediate vicinity. Methylation of either the +6 or the +24 5' -CCGG-3' sequence also compromises formation of the DNA-protein complex. A 40 nucleotide pair oligodeoxyribonucleotide encompassing the -215 5' -CCGG-3' site in the late E2A promoter can also form DNA-protein complexes which is not affected by the introduction of a 5-mC residue in the -215 position. The data suggest that the AP2 protein together with other proteins is involved in the generation of a transcription-activating complex with the late E2A promoter of Ad2 DNA, and the formation of this complex is completely abolished when both the +6 and +24 5'-CCGG-3' sequences are methylated.
authors.affiliation: Institute for Genetics, University of Cologne, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Hermann
authors.forename: W
authors.initials: W
authors.lastname: Doerfler
mesh_terms: D017456:Adenovirus Early Proteins; D000260:Adenoviruses, Human / Q000235:genetics*; D001483:Base Sequence; D002467:Cell Nucleus / Q000378:metabolism; D004279:DNA, Viral / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000378:metabolism*; D015967:Gene Expression Regulation, Viral; D006367:HeLa Cells / Q000378:metabolism; D006801:Humans; D008745:Methylation; D008969:Molecular Sequence Data; D015345:Oligonucleotide Probes; D009856:Oncogene Proteins, Viral / Q000235:genetics*; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D015183:Restriction Mapping; D050656:Transcription Factor AP-2; D014157:Transcription Factors / Q000378:metabolism*
chemical_list: D017456:Adenovirus Early Proteins; D004279:DNA, Viral; D004268:DNA-Binding Proteins; D015345:Oligonucleotide Probes; D009856:Oncogene Proteins, Viral; D050656:Transcription Factor AP-2; D014157:Transcription Factors