Roles of DNA adenine methylation in controlling replication of the REPI replicon of plasmid pColV-K30.
DNA adenine methylation controls DNA replication of plasmids containing the prototypic REPI replicon by affecting protein recognition and by altering the helical stability of the origin. Denaturing gradient gel electrophoresis shows that adenine methylated origin DNA is more easily melted than unmethylated. However, because an added DNA adenine methylation (dam) site at the origin, whether in or out of phase with other helically aligned dam sites, actually prevents replication, we conclude that destabilization of the helix is not the exclusive function of adenine methylation in REPI replication. We find that the conformation and degree of methylation at the origin, features which are important for protein recognition, are essential for replication. In fact, RepI, a protein required for replication initiation at REPI replicons, contains a region homologous with a domain in proteins which specifically recognize and bind 5'-GATC-3'. We propose that the dam sites in the origin play a dual role: one is destabilization of the helix, and the other is protein recognition.
Gammie
A E
AE
Department of Microbiology and Immunology, Oregon Health Sciences University, Portland 97201.
Crosa
J H
JH
D000225:Adenine / Q000378:metabolism*; D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism; D001483:Base Sequence; D004261:DNA Replication; D004269:DNA, Bacterial / Q000096:biosynthesis / Q000378:metabolism*; D004268:DNA-Binding Proteins; D004586:Electrophoresis; D008745:Methylation; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D010957:Plasmids; D012091:Repetitive Sequences, Nucleic Acid; D012093:Replicon; D016415:Sequence Alignment; D015534:Trans-Activators; D014169:Transformation, Bacterial
D001426:Bacterial Proteins; D004269:DNA, Bacterial; D004268:DNA-Binding Proteins; C069089:RepI protein, Plasmid ColV-K30; D015534:Trans-Activators; D000225:Adenine