ArticleThe Journal of biological chemistry2012
Proximal recognition sites facilitate intrasite hopping by DNA adenine methyltransferase: mechanistic exploration of epigenetic gene regulation.
Article in The Journal of biological chemistry, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed, 7 citations in OpenAlex.
- DNA methylation affects gene expression but not global chromatin structure inJournal of bacteriology · 2025Article
- Structures of Escherichia coli DNA adenine methyltransferase (Dam) in complex with a non-GATC sequence: potential implications for methylation-independent transcriptional repression.Nucleic acids research · 2015Article
- DNA Methylation.EcoSal Plus · 2014Article
Corrections and comments
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Authors and funding
2 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The methylation of adenine in palindromic 5'-GATC-3' sites by Escherichia coli Dam supports diverse roles, including the essential regulation of virulence genes in several human pathogens. As a result of a unique hopping mechanism, Dam methylates both strands of the same site prior to fully dissociating from the DNA, a process referred to as intrasite processivity. The application of a DpnI restriction endonuclease-based assay allowed the direct interrogation of this mechanism with a variety of DNA substrates. Intrasite processivity is disrupted when the DNA flanking a single GATC site is longer than 400 bp on either side. Interestingly, the introduction of a second GATC site within this flanking DNA reinstates intrasite methylation of both sites. Our results show that intrasite methylation occurs only when GATC sites are clustered, as is found in gene segments both known and postulated to undergo in vivo epigenetic regulation by Dam methylation. We propose a model for intrasite methylation in which Dam bound to flanking DNA is an obligate intermediate. Our results provide insights into how intrasite processivity, which appears to be context-dependent, may contribute to the diverse biological roles that are carried out by Dam.
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