title: The interaction of Escherichia coli replication factor Y with complementary strand origins of DNA replication. Contact points revealed by DNase footprinting and protection from methylation.
abstract: A defined region of the viral (+) strand of phi X174 and of each strand of pBR322 DNA serves as an effector for the ATPase activity of replication factor Y from Escherichia coli. These loci can also function as complementary strand origins of DNA replication in a single-stranded circular leads to replicative form pathway whose protein requirements are characteristic of phi X174 DNA. Despite this functional similarity, these three sites possess no extensive sequence homology. To uncover a possible common structural determinant, factor Y recognition sequences were treated with pancreatic DNase or dimethyl sulfate in the presence and absence of this replication protein. When factor Y was present, the action of the nuclease was altered in a similar manner on each of the three templates, indicating that factor Y was bound to the entire length of its effector site. Factor Y-mediated modification of the dimethyl sulfate methylation patterns gave evidence of specific, tight protein-DNA contacts. Protection maps, devised by plotting the results of the methylation and footprinting experiments on duplex structures, suggest that tertiary interactions are either involved in the formation of a factor Y effector site or are induced by the binding of the protein.
mesh_terms: D000251:Adenosine Triphosphatases / Q000302:isolation & purification / Q000378:metabolism*; D010584:Bacteriophage phi X 174; D001483:Base Sequence; D004265:DNA Helicases / Q000378:metabolism*; D004261:DNA Replication; D004262:DNA Restriction Enzymes; D004279:DNA, Viral / Q000378:metabolism; D003851:Deoxyribonucleases / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics*; D008745:Methylation; D009690:Nucleic Acid Conformation
chemical_list: D004279:DNA, Viral; D003851:Deoxyribonucleases; D004262:DNA Restriction Enzymes; D000251:Adenosine Triphosphatases; D004265:DNA Helicases