ArticleNucleic acids research2008
DNA base flipping by both members of the PspGI restriction-modification system.
Article in Nucleic acids research, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
4 citing papers in PubMed, 6 citations in OpenAlex.
- Single-Molecule Fluorescence Using Nucleotide Analogs: A Proof-of-Principle.The journal of physical chemistry letters · 2014Article
- Functional analysis of an acid adaptive DNA adenine methyltransferase from Helicobacter pylori 26695.PloS one · 2011Article
- Time-resolved fluorescence studies of nucleotide flipping by restriction enzymes.Nucleic acids research · 2009Article
- Central base pair flipping and discrimination by PspGI.Nucleic acids research · 2008Article
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Authors and funding
2 authors at 1 institution in 1 country.
Funding
Abstract
The PspGI restriction-modification system recognizes the sequence CCWGG. R.PspGI cuts DNA before the first C in the cognate sequence and M.PspGI is thought to methylate N4 of one of the cytosines in the sequence. M.PspGI enhances fluorescence of 2-aminopurine in DNA if it replaces the second C in the sequence, while R.PspGI enhances fluorescence when the fluorophore replaces adenine in the central base pair. This strongly suggests that the methyltransferase flips the second C in the recognition sequence, while the endonuclease flips both bases in the central base pair out of the duplex. M.PspGI is the first N4-cytosine MTase for which biochemical evidence for base flipping has been presented. It is also the first type IIP methyltransferase whose catalytic activity is strongly stimulated by divalent metal ions. However, divalent metal ions are not required for its base-flipping activity. In contrast, these ions are required for both base flipping and catalysis by the endonuclease. The two enzymes have similar temperature profiles for base flipping and optimal flipping occurs at temperatures substantially below the growth temperature of the source organism for PspGI and for the catalytic activity of endonuclease. We discuss the implications of these results for DNA binding by these enzymes and their evolutionary origin.
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Registered trials
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